osteoporosis (redirected from Postmenopausal osteoporosis)

Osteoporosis 

Definition

The word osteoporosis literally means "porous bones." It occurs when bones lose an excessive amount of their protein and mineral content, particularly calcium. Over time, bone mass, and therefore bone strength, is decreased. As a result, bones become fragile and break easily. Even a sneeze or a sudden movement may be enough to break a bone in someone with severe osteoporosis.

Description

Osteoporosis is a serious public health problem. Some 44 million people in the United States are at risk for this potentially debilitating disease, which is responsible for 1.5 million fractures (broken bones) annually. These fractures, which are often the first sign of the disease, can affect any bone, but the most common locations are the hip, spine, and wrist. Breaks in the hip and spine are of special concern because they almost always require hospitalization and major surgery, and may lead to other serious consequences, including permanent disability and even death.

To understand osteoporosis, it is helpful to understand the basics of bone formation. Bone is living tissue that is constantly being renewed in a two-stage process (resorption and formation) that occurs throughout life. In the resorption stage, old bone is broken down and removed by cells called osteoclasts. In the formation stage, cells called osteoblasts build new bone to replace the old. During childhood and early adulthood, more bone is produced than removed, reaching its maximum mass and strength by the mid-30s. After that, bone is lost at a faster pace than it is formed, so the amount of bone in the skeleton begins to slowly decline. Most cases of osteoporosis occur as an acceleration of this normal aging process, which is referred to as primary osteoporosis. The condition also can be caused by other disease processes or prolonged use of certain medications that result in bone loss. If so, this is called secondary osteoporosis.

Osteoporosis occurs most often in older people and in women after menopause. It affects nearly half of men and women over the age of 75. Women are about five times more likely than men to develop the disease. They have smaller, thinner bones than men to begin with, and they lose bone mass more rapidly after menopause (usually around age 50), when they stop producing a bone-protecting hormone called estrogen. In the five to seven years following menopause, women can lose about 20% of their bone mass. By age 65 or 70, though, men and women lose bone mass at the same rate. As an increasing number of men reach an older age, there is more awareness that osteoporosis is an important health issue for them as well. In fact, a 2003 report noted that one in every eight men over age 50 will suffer a hip fracture as a result of osteoporosis.

Causes and symptoms

A number of factors increase the risk of developing osteoporosis. They include:

• Age. Osteoporosis is more likely as people grow older and their bones lose tissue.
• Gender. Women are smaller and start out with less bone. They also lose bone tissue more rapidly as they age. While women commonly lose 30-50% of their bone mass over their lifetimes, men lose only 20-33%.
• Race. Caucasian and Asian women are most at risk for the disease, but African American and Hispanic women can get it too.
• Figure type. Women with small bones and those who are thin are more liable to have osteoporosis.
• Early menopause. Women who stop menstruating early because of heredity, surgery or lots of physical exercise may lose large amounts of bone tissue early in life. Conditions such as anorexia and bulimia also may lead to early menopause and osteoporosis.
• Lifestyle. People who smoke or drink too much, or do not get enough exercise have an increased chance of osteoporosis.
• Diet. Those who do not get enough calcium or protein may be more likely to have osteoporosis. That is why people who constantly diet are more prone to the disease.
• Genetics. Research in Europe reported in 2003 that variations of a gene on chromosome 20 might make some postmenopausal women more likely to have osteoporosis. Studies were continuing on how to identify the gene and use information from the research to prevent osteoporosis in carriers.

Osteoporosis is often called the "silent" disease, because bone loss occurs without symptoms. People often do not know they have the disease until a bone breaks, frequently in a minor fall that would not normally cause a fracture. A common occurrence is compression fractures of the spine. These can happen even after a seemingly normal activity, such as bending or twisting to pick up a light object. The fractures can cause severe back pain, but sometimes go unnoticed—either way, the vertebrae collapse down on themselves, and the person actually loses height. The hunchback appearance of many elderly women, sometimes called "dowager's" hump or "widow's" hump, is due to this effect of osteoporosis on the vertebrae.

Diagnosis

Certain types of doctors may have more training and experience than others in diagnosing and treating people with osteoporosis. These include a geriatrician, who specializes in treating the aged; an endocrinologist, who specializes in treating diseases of the body's endocrine system (glands and hormones); and an orthopedic surgeon, who treats fractures such as those caused by osteoporosis.

Before making a diagnosis of osteoporosis, the doctor usually takes a complete medical history, conducts a physical exam, and orders x rays, as well as blood and urine tests, to rule out other diseases that cause loss of bone mass. The doctor also may recommend a bone density test. This is the only way to know for certain if osteoporosis is present. It also can show how far the disease has progressed.

Several diagnostic tools are available to measure bone density. The ordinary x ray is one, though it is the least accurate for early detection of osteoporosis, because it does not reveal bone loss until the disease is advanced and most of the damage has already been done. Two other tools that are more likely to catch osteoporosis at an early stage are computed tomography scans (CT scans) and machines called densitometers, which are designed specifically to measure bone density.

The CT scan, which takes a large number of x rays of the same spot from different angles, is an accurate test, but uses higher levels of radiation than other methods. The most accurate and advanced of the densitometers uses a technique called DEXA (dual energy x-ray absorptiometry). With the DEXA scan, a double x-ray beam takes pictures of the spine, hip, or entire body. It takes about 20 minutes to do, is painless, and exposes the patient to only a small amount of radiation—about one-fiftieth that of a chest x ray.

Doctors do not routinely recommend the test, partly because access to densitometers is still not widely available. People should talk to their doctors about their risk factors for osteoporosis and if, and when, they should get the test. Ideally, women should have bone density measured at menopause, and periodically afterward, depending on the condition of their bones. Men should be tested around age 65. Men and women with additional risk factors, such as those who take certain medications, may need to be tested earlier.

Treatment

There are a number of good treatments for primary osteoporosis, most of them medications. Two medications, alendronate and calcitonin (in nose spray form), have been approved by the Food and Drug Administration (FDA). They provide people who have osteoporosis with a variety of choices for treatment. For people with secondary osteoporosis, treatment may focus on curing the underlying disease.

Drugs

For many women who have gone through menopause, the treatment of choice for osteoporosis has been hormone replacement therapy (HRT), also called estrogen replacement therapy. Many women choose HRT when they undergo menopause to alleviate symptoms such as hot flashes, but hormones increase a woman's supply of estrogen, which helps build new bone, while preventing further bone loss. A 2002 report from a large clinical trial called the Women's Health Initiative helped verify HRT's positive effects in preventing osteoporosis in postmenopausal women.

However, the WHI also revealed several risks with taking combined HRT (estrogen and progesterone). In fact, the trial was stopped early because the incidence of invasive breast cancer in women on HRT passed a threshold that was considered too risky for the benefits they were receiving. The study also found that the women on combined hormone therapy were at increased risk for coronary heart disease and stroke. Whether or not a woman takes hormones and for how long is a decision she should make carefully with her doctor. Women should talk to their doctors about personal risks for osteoporosis, as well as their risks for heart disease and breast cancer.

Since estrogen may no longer be recommended for prevention of osteoporosis, selective use of alendronate and calcitonin are possible alternatives. Alendronate and calcitonin both stop bone loss, help build bone, and decrease fracture risk by as much as 50%. Alendronate (sold under the name Fosamax) is the first nonhormonal medication for osteoporosis ever approved by the FDA. It attaches itself to bone that has been targeted by bone-eating osteoclasts, protecting the bone from these cells. Osteoclasts help the body break down old bone tissue.

Calcitonin is a hormone that has been used as an injection for many years. A new version is on the market as a nasal spray. It too slows down bone-eating osteoclasts.

Side effects of these drugs are minimal, but calcitonin builds bone by only 1.5% a year, which may not be enough for some women to recover the bone they lose. Fosamax has proven safe in large, multi-year studies, but not much is known about the effects of its long-term use. Several medications under study include other bisphosphonates that slow bone breakdown (like alendronate), sodium fluoride, vitamin D metabolites, and selective estrogen receptor modulators. Some of these treatments are already being used in other countries, but have not yet been approved by the FDA for use in the United States.

In early 2003, a report announced that the FDA had recently approved the first drug that could form bone in osteoporosis patients. The drug is a form of the human parathyroid hormone called teriparatide. It shows promise for those patients at highest risk for fracture from the disease. There are some patients who cannot use the drug, so all considering the new treatment must check with their physician and may need to undergo bone densitometry scans or other testing.

Surgery

Unfortunately, much of the treatment for osteoporosis is for fractures that result from advanced stages of the disease. For complicated fractures, such as broken hips, hospitalization and a surgical procedure are required. In hip replacement surgery, the broken hip is removed and replaced with a new hip made of plastic, or metal and plastic. Though the surgery itself is usually successful, complications of the hip fracture can be serious. Those individuals have a 5-20% greater risk of dying within the first year following the injury than do others in their age group. A large percentage of those who survive are unable to return to their previous level of activity, and many move self-care to a supervised living situation or nursing home. That is why getting early treatment and taking steps to reduce bone loss are vital.

Alternative treatment

Alternative treatments for osteoporosis focus on maintaining or building strong bones. A healthy diet low in fats and animal products and containing whole grains, fresh fruits and vegetables, and calcium-rich foods (such as dairy products, dark-green leafy vegetables, sardines, salmon, and almonds), along with nutritional supplements (such as calcium, magnesium, and vitamin D), and weight-bearing exercises are important components of both conventional prevention and treatment strategies and alternative approaches to the disease. In addition, alternative practitioners recommend a variety of botanical medicines or herbal supplements. Herbal supplements designed to help slow bone loss emphasize the use of calcium-containing plants, such as horsetail (Equisetum arvense), oat straw (Avena sativa), alfalfa (Medicago sativa), licorice (Glycyrrhiza galbra), marsh mallow (Althaea officinalis), and yellow dock (Rumex crispus). Homeopathic remedies focus on treatments believed to help the body absorb calcium. These remedies are likely to include such substances as Calcarea carbonica (calcium carbonate) or silica. In traditional Chinese medicine, practitioners recommend herbs thought to slow or prevent bone loss, including dong quai (Angelica sinensis) and Asian ginseng (Panax ginseng). Natural hormone therapy, using plant estrogens (from soybeans) or progesterone (from wild yams), may be recommended for women who cannot or choose not to take synthetic hormones.

Prognosis

There is no cure for osteoporosis, but it can be controlled. Most people who have osteoporosis fare well once they receive treatment. The medicines available now build bone, protect against bone loss, and halt the progress of this disease.

Prevention

Building strong bones, especially before the age of 35, and maintaining a healthy lifestyle are the best ways to prevent osteoporosis. To build as much bone mass as early as possible in life, and to help slow the rate of bone loss later in life, doctors advise:

Getting calcium from foods

Experts recommend 1,500 milligrams (mg) of calcium per day for adolescents, pregnant or breastfeeding women, older adults (over 65), and postmenopausal women not using hormone replacement therapy. All others should get 1,000 mg per day. Foods are the best source for this important mineral. Milk, cheese, and yogurt have the highest amounts. Other foods that are high in calcium are green leafy vegetables, tofu, shellfish, Brazil nuts, sardines, and almonds.

Taking calcium supplements

Many people, especially those who do not like or can not eat dairy foods, do not get enough calcium in their diets and may need calcium supplements. Supplements vary in the amount of calcium they contain. Those with calcium carbonate have the most amount of useful calcium. Supplements should be taken with meals and accompanied by six to eight glasses of water a day.

Getting vitamin d

Vitamin D helps the body absorb calcium. People can get vitamin D from sunshine with a quick (15-20 minute) walk each day or from foods such as liver, fish oil, and vitamin-D fortified milk. During the winter months it may be necessary to take supplements. Four hundred mg daily is usually the recommended amount.

Avoiding smoking and alcohol

Smoking reduces bone mass, as does heavy drinking. Avoiding smoking and limiting alcoholic drinks to no more than two per day reduces risks. An alcoholic drink is one-and-a-half ounces of hard liquor, 12 ounces of beer, or five ounces of wine.

Exercise

Exercising regularly builds and strengthens bones. Weight-bearing exercises—where bones and muscles work against gravity—are best. These include aerobics, dancing, jogging, stair climbing, tennis, walking, and lifting weights. People who have osteoporosis may want to attempt gentle exercise, such as walking, rather than jogging or fast-paced aerobics, which increase the chance of falling. Exercising three to four times per week for 20-30 minutes each time helps.

Resources

Periodicals

Doering, Paul L. "Treatment of Menopause Post-WHI: What Now?" Drug Topics April 21, 2003: 85.

Elliott, William T. "HRT, Estrogen, and Postmenopausal Women: Year-old WHI Study Continues to Raise Questions." Critical Care Alert July 2003: 1.

LoBuono, Charlotte. "New Osteoporosis Drug is First to Form Bone." Drug Topics January 6, 2003: 24.

"More Men at Osteoporosis Risk than Commonly Believed." Tufts University Health and Nutrition Letter August 2003: 8.

Nelson, Heidi D. "Postmenopausal Osteoporosis and Estrogen." American Family Physician August 15, 2003: 606.

"Osteoporosis Gene Identified." Diagnostics and Imaging Week March 13, 2003 4.

"Three Out of Four Women Currently Taking Prescriptions for Osteoporosis Are Not Receiving Full Treatment, According to Recent Data from a National Physician Audit." Drug Cost Management Report January 2003: 11.

Key terms

Alendronate — A nonhormonal drug used to treat osteoporosis in postmenopausal women.

Anticonvulsants — Drugs used to control seizures, such as in epilepsy.

Biphosphonates — Compounds (like alendronate) that slow bone loss and increase bone density.

Calcitonin — A hormonal drug used to treat postmenopausal osteoporosis

Estrogen — A female hormone that also keeps bones strong. After menopause, a woman may take hormonal drugs with estrogen to prevent bone loss.

Glucocorticoids — Any of a group of hormones (like cortisone) that influence many body functions and are widely used in medicine, such as for treatment of rheumatoid arthritis inflammation.

Hormone replacement therapy (HRT) — Also called estrogen replacement therapy, this controversial treatment is used to relieve the discomforts of menopause. Estrogen and another female hormone, progesterone, are usually taken together to replace the estrogen no longer made by the body.

Menopause — The ending of a woman's menstrual cycle, when production of bone-protecting estrogen decreases.

Osteoblasts — Cells in the body that build new bone tissue.

Osteoclasts — Cells that break down and remove old bone tissue.

Selective estrogen receptor modulator — A hormonal preparation that offers the beneficial effects of hormone replacement therapy without the increased risk of breast and uterine cancer associated with HRT.

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osteoporosis /os·teo·po·ro·sis/ (-por-o´sis) abnormal rarefaction of bone; it may be idiopathic or occur secondary to other diseases.osteoporot´ic

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posttraumatic osteoporosis  loss of bone substance following a nerve-damaging injury, sometimes due to an increased blood supply caused by the neurogenic insult, or to disuse secondary to pain; a component of reflex sympathetic dystrophy.

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os·te·o·po·ro·sis (st--p-rss) n. pl. os·te·o·po·ro·ses (-sz) A disease characterized by decrease in bone mass and density, occurring especially in postmenopausal women, resulting in a predisposition to fractures and bone deformities such as vertebral collapse. oste·o·po·rotic (-rtk) adj.

osteoporosis Top: detail of normal femur Bottom: detail of osteoporotic femur

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osteoporosis

[os′tē·ōpərō′sis]

Etymology: Gk, osteon + poros, passage, osis, condition

a disorder characterized by abnormal loss of bone density and deterioration of bone tissue, with an increased fracture risk. It occurs most frequently in postmenopausal women, sedentary or immobilized individuals, and patients on long-term steroid therapy. Osteoporosis may be without a known cause or secondary to other disorders, such as thyrotoxicosis or the bone demineralization caused by hyperparathyroidism. osteoporotic, adj.

observations Individuals are typically asymptomatic early in the disease. The first symptom is usually a dull, aching, constant pain in the bones, particularly the back and chest. The pain may radiate down the leg, and muscle spasms may be present. As the spinal column mass diminishes, dorsal kyphosis and cervical lordosis increase, leading to multiple compression fractures of the spine and a reduction in height. Other fractures occur with minimal or no trauma. Clinical evaluation reveals a complex of risk factors such as estrogen deficiency, androgen deficiency, hyperthyroidism, nulliparity, chronic malnutrition, long-term lack of calcium intake, long history of tobacco use, ethanol abuse, steroid use or abuse, sedentary life-style, immobility, familial history, and underlying skeletal disease. Bone mineral density (BMD) tests reveal loss of bone density. X-rays show decreased radiodensity after 25% to 40% loss of bone calcium. Immobility from increased fractures and deformity from spinal crushing are common complications.

interventions Acute treatment focuses on calcium and vitamin D supplementation; use of calcitonin, bisphosphonates (etidronate, alendronate, pamidronate), or selective estrogen receptor modulators (raloxifene) to prevent bone resorption; nonsteroidal antiinflammatory drugs for pain; and use of estrogen-progestin supplements, which is controversial. Calcium levels are monitored regularly.

nursing considerations Nursing care is aimed at prevention and early detection. Prevention is centered around proper nutrition with a balanced diet rich in calcium and vitamin D; regular exercise that emphasizes strengthening and weight bearing; cessation of tobacco use and ethanol abuse; and adequate fluoride ingestion. Bone density surveys should be encouraged every 1 to 3 years after age 49 for early detection. Acute care stresses good nutrition with calcium and vitamin D supplementation; a consistent exercise regimen, including moderate, weight-bearing hyperextension and resistance exercises to slow calcium loss and strengthen musculature; heat and massage for muscle spasm; orthopedic supports for back and neck to prevent stress fractures; and canes to aid in walking. Instruction in fall and fracture prevention measures is important to help the individual decrease fracture risk and maintain independence in activities of daily living. Education about medication effects and side effects is needed.

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osteoporosis [os″te-o-po-ro´sis]

a decreased mass per unit volume of normally mineralized bone, calculated in comparison to age- and sex-matched controls; it is the most prevalent bone disease worldwide. There are many etiologic factors of osteoporosis, which give the various types their names.

Postmenopausal, estrogen-deficient osteoporosis is the most common type; more than half the women in the United States 50 years of age or older are likely to have radiologically detectable evidence of abnormally decreased bone mass (osteopenia) in the spine, and in more than a third, major orthopedic problems related to osteoporosis will eventually occur. Most fractures sustained by women over the age of 50 are secondary to osteoporosis. Women at risk for this disorder can reduce that risk by maintaining adequate calcium levels with dietary calcium or calcium supplements (see diet-related bone loss below), and taking estrogen in the perimenopausal period when indicated. Estrogen replacement therapy is especially recommended for women whose ovaries were removed before age 50.

Age-related osteoporosis is a type that occurs in both men and women and is caused by bone loss that normally accompanies aging.

Diet-related bone loss is caused by chronic dietary deficiencies in calcium and protein, as well as deficiency in vitamin C, which is an essential cofactor in collagen metabolism. Intestinal absorption of calcium becomes less efficient with age; hence older persons need more rather than less dietary calcium to maintain a positive calcium balance. Although dairy products are the primary source of dietary calcium, supplementary calcium is needed by some women. Healthy premenopausal women over the age of 30 may need as much as 1000 mg of calcium a day, which is the amount supplied by a quart of milk. However, for pregnant women and those over the age of 50, the recommended daily intake increases to more than 1500 mg. Lactating women need 2000 mg of calcium daily to prevent untimely catabolism of bone. The vitamin D metabolite 1,25-dihydroxycholecalciferol is the active hormone that helps maintain normal serum calcium and phosphate levels. Because of inadequate exposure to sunlight, decreased intestinal absorption of vitamin D, and limited intake of milk, elderly persons often are vitamin D–deficient. Vitamin D is a component of multivitamins, and health care providers often recommend supplemental multivitamins for the elderly.

Disuse osteoporosis is related to the response of bone mass change to mechanical stress. Net bone mass does not change throughout much of adult life; however, living bone is never metabolically at rest and constantly remodels and reappropriates its mineral stores along lines of mechanical stress. Without weight-bearing stress, bone mass diminishes. As much as 30 to 40 per cent of initial bone mass may be lost after six months of total immobilization, as in paraplegia and quadriplegia due to spinal cord injury. Movement alone is not sufficient to prevent osteoporosis. There must be weight-bearing activity and the use of antigravity muscles to maintain healthy bones.

Heritable osteoporosis includes at least four types of congenital diseases grouped under the term osteogenesis imperfecta. Symptoms of varying severity that are characteristic of these disorders include skeletal fragility, multiple pathologic fractures, generalized osteoporosis, and scoliosis. All of the diseases included under osteogenesis imperfecta are thought to be associated with defective bone matrix formation.

Endocrine-mediated bone loss can produce osteoporosis because numerous endocrine hormones affect skeletal remodeling and hence skeletal mass. Examples of endocrine disorders that can produce associated osteopenia include hypogonadism, hyperthyroidism, hyperparathyroidism, and hyperadrenalism or chronic glucocorticoid hormone excess.

Disease-related bone loss can occur with almost any kind of chronic disease that is associated with malnutrition and disuse. Osteopenia is also a common complication of most tumors of the bone marrow. Leukemia, lymphoma, and the extremely rare mast cell tumor also may be associated with osteoporosis.

Idiopathic osteoporosis, in both the adult and juvenile form, is extremely uncommon. Drug-induced bone loss may be associated with long-term use of heparin for anticoagulation therapy or with the administration of methotrexate, which has both cytotoxic and calciuric effects.

Diagnosis. Osteoporosis is an insidious disease that silently robs the skeleton of its banked resources. Sometimes it is decades before the bone is weak enough to sustain a spontaneous fracture. The most common sites for such bone loss and consequent fractures are the thoracic and lumbar vertebral bodies, ribs, proximal femur, and distal radius. The earliest signs of osteoporosis are often associated with compression fracture of the spine characterized by an episode of acute pain in the middle to low thoracic or high lumbar region. Prevention of osteoporosis through diet, exercise, and the reduction of risk factors should be a priority. The critical years for building bone mass are before the age of 30. Maintenance of skeletal mass is accomplished by oral calcium supplementation, vitamin D therapy, weight-bearing activity through a daily exercise program, and sodium fluoride therapy.

During the intervals between compression fractures, the patient may be symptom-free, but kyphosis, decrease in height, and appearance of a “dowager's hump” are reliable indicators of the early progress of the disease. Two other associated effects of vertebral compression are the result of a decrease in the size of the thoracic and abdominal cavities. The patient experiences diminished activity tolerance as a result of disease-related postural changes and often reports early satiety and a bloated feeling after eating only a small amount of food.

Radiographs of the thoracic and lumbar spine show a visible loss of bone density. In general, as much as 30 to 50 per cent of the bone mass must be lost before the decrease can be seen on x-ray. Bone density measurement can help in evaluation of this disease and prediction of the likelihood of fracture.

Treatment and Patient Care. The management of osteoporosis is concerned with treatment of symptomatic disease and its sequelae and with maintenance of skeletal mass and integrity. Treatment of acute symptoms is aimed at relieving pain, providing comfortable mechanical support for the spine, arranging assistance in activities of daily living, coordinating a rehabilitation program, and providing encouragement and reassurance to the patient and family. The rehabilitation process must include instruction in proper back care, and especially in how to avoid unnecessary spinal compression forces while lifting or bending.

Estrogen replacement therapy is often prescribed for women at menopause. Because it increases the risk for breast and gynecologic malignancies, careful assessment of these patients is necessary. Pharmacologic agents approved by the Food and Drug Association for osteoporosis treatment or treatment include the bisphosphonatesalendronate and risedronate; calcitonin, estrogen replacement therapy, and selective estrogen receptor modulators such as raloxifene.

Information on osteoporosis can be obtained by writing the National Osteoporosis Foundation, 1232 22nd St. NW, Washington, DC 20037-1292 or consulting their web site at http://www.nof.org. They have also published clinical guidelines for the prevention and treatment of osteoporosis on their web site.

Loss of bone mass due to osteoporosis produces characteristic changes in the curvature of the spine. At far left are normal curvatures compared with those typical of osteoporosis. Figures to the right show the normal spine at age 40 and osteoporotic changes at 60 and 70 years of age. As shown, these changes bring about a loss of as much as 6 to 9 inches in height, and the so-called dowager's hump in the upper thoracic vertebrae.

osteoporosis circumscrip´ta demineralization occurring in localized areas of bone, especially in the skull.

osteoporosis of disuse that occurring when the normal laying down of bone is slowed because of lack of the normal stimulus of functional stress on the bone.

post-traumatic osteoporosis loss of bone substance after an injury in which there is nerve damage, sometimes due to decreased blood supply caused by the neurogenic insult, or to disuse secondary to pain. Called also Sudeck's disease.

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osteoporosis,

n bone disorder characterized by porosity, low mass, and structural deterioration, which leads to fragility and increased likelihood of fracture, especially of the spine, hip, and wrist.

Osteoporosis.

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osteoporosis (os´tēōpôrō´sis),

n an enlargement of the soft marrow and haversian spaces resulting from a decreased rate of formation of the hard bone matrix. With the exception of immobilized parts, it is a systemic disorder that occurs in advanced age (senile osteoporosis), during ACTH and cortisone therapy, during and after menopause, in limited physical activity, in Cushing syndrome, during malnutrition, and in other disorders of matrix formation such as hyperadrenalism, hyperthyroidism, vitamin C deficiencies, and deficiency of androgenic steroids. See also atrophy, bone and bone rarefaction.

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osteoporosis

a pathological loss of bone but the remaining bone is structurally normal. There is an imbalance in bone formation and resorption in favor of resorption. Bone becomes light and porous and fragile so that it fractures easily. It is associated with general undernutrition rather than specific nutritional deficiencies. Other causative factors are disuse, senility, lactation, weightlessness.

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disuse osteoporosis

that occurring when the normal laying down of bone is slowed because of lack of the normal stimulus of functional stress on the bone.

post-traumatic osteoporosis

loss of bone substance after an injury in which there is nerve damage, sometimes due to decreased blood supply caused by the neurogenic insult, or to disuse secondary to pain.

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osteoporosis

Brittle bones Orthopedics A condition characterized by ↓ bone mass and density–demineralization, bone fragility; it is the most common morbid condition of elderly ♀ Statistics Age-related osteoporosis causes > 105 fractures/yr–US–vertebrae 54%, hip 23%, distal forearm or Colles fracture, 17%; 25% of ♀ > 70 have evidence of vertebral fractures, as do 50% of ♀ > 80; 90% of femoral head fractures–FHFs occur in those > 70, US Clinical Pain, loss of height, other deformities and fractures Morbidity Osteoporosis-related fractures occur in 1.5 million/yr–US Risk factors White, elderly, ♀ thin, immobilization, space travel–weightlessness, extreme exercise and/or amenorrhea, alcoholism, endocrinopathies–eg, acromegaly, Cushing's disease, hypogonadism, hyperthyroidism, hyperparathyroidism, smoking Possible risk factors Heredity, inadequate exercise, ↓ Ca2+ intake, exercise, small body frame, levels of serum and urinary Ca2+ and creatinine; Pts receiving physiologic l-thyroxine may have ↓ bone density Diagnosis Bone densitometry, N-telopeptide measurement Treatment 1. Antiresorptive agents–eg, estrogen, calcium, calcitonin, biphosphonates and others eg anabolic steroids, calcitriol; K+ bicarbonate improves Ca2+ and phosphorous balance by ↓ hydroxyproline excretion–a marker of bone resorption, and ↑ osteocalcin–a marker of bone formation 2. Bone stimulation regimens–eg, sodium fluoride, PTH, and growth factors–eg, IGF-I, IGF-II, transforming growth factor-β and 3. Ca2+ supplementation–1000 mg/day, may slow axial and appendicular bone loss in postmenopausal ♀ See Congenital cranial osteoporosis, Malignant osteoporosis.

Osteoporosis–primary involutional  

Type I  or 'postmenopausal' osteoporosis A relatively common condition with a 6:1 ♀:♂ ratio, which affects ages 50-75, characterized by ↓ estrogen, accelerated trabecular bone loss, 'crush' fractures associated with abnormal PTH secretion and age-related ↓ in response to vitamin D 1,25(OH₂D)₂]; 15-20 years after the onset of menopause, type I osteoporosis may reach a 'burned-out' phase with no further bone loss

Type II or 'age-related' osteoporosis A less common condition with a 2:1 ♀:♂ ratio, which affects > age 70 and is characterized by trabecular and cortical bone loss–the elderly ♀ typically suffers a 35% loss of cortical bone and a 50% loss of trabecular bone, affecting vertebral bodies and flat bones, resulting in hip fractures and wedge-type vertebral fractures, due to 1. ↓ osteoblast function–↓ IGF-I, hGH, and local regulators 2. Marked ↓ in calcium absorption–to 50% of 'normal' with ↓ vitamin D 1,25(OH₂D)₂, possibly due to ↓ activity of renal 1-α hydroxylase and 3. Other factors, including ↓ clearance of parathyroid hormone's carboxyl–COOH terminals and ↑ calcium resorption; calcitonin's role in this form of osteoporosis is unclear

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Patient discussion about osteoporosis.

Q. what do you do with a broken heart? I HAD A ECHO DONE THIS WEEK AND CONCLUSION WAS: 1)SEVERE MIRTAL REGURGITATION WITH LEFT ATRIAL DILATATION 2)LOW NORMAL LV FUNCTION CHEST X RAY IMPRESSION WAS: 1)NORMAL SIZE HEART WITH PROMINENT LEFT HEART BORDER. 2)PROMINENT MARKINGS WITH PROMINENT CHANGES. 3)THE BONES ARE OSTEOPENIC. BLOOD TEST....CHEMISTRY B TYPE NATRIURETIC PEPTIDE HIGH 260

A. The left atrial dilatation is likely the cause of the elevated beta natriuretic peptide. A cardiologist should be able to talk with you about dealing with the mitral valve regurgitation.

Q. My mom have seen her bad days with osteoporosis. My mom have seen her bad days with osteoporosis. I know her pain during winter where she cannot make herself move every morning. I have been seeing her for many years on medications. Looking over my mom`s condition I started to keep myself fit. This will help to control the future chances of osteoporosis for me. I have heard that it runs in families. I do jogging but I was concerned as is this enough?

A. Generally osteoporosis starts with bone loss and this bone loss starts after the person crosses his mid 30`s. Weight can increase the osteoporosis symptoms. So you must do some weight bearing exercise. Like gardening, aerobics, climbing, brisk walking. Though you must eat well. Do eat good diet rich in vitamin D. also have green leafy vegetables and milk as well. This diet must be increased once you are over the age of 30.
http://www.youtube.com/watch?v=CdLhBMoYfMk&eurl=http://www.imedix.com/health_community/vCdLhBMoYfMk_osteoporosis_treatment_bone_loss_osteopenia?q=osteoporosis&feature=player_embedded

Q. I am excited to know in what way diet helps in preventing osteoporosis? my mother is suspecting to be having osteoporosis. She regularly complains of leg pain. Upon consultation with the doctor it was found with low calcium in her blood. She was given calcium tablets and was told to increase in the diet rich in calcium. She is taking milk and yoghurt especially. She is not well yet but shows some improvement. I am excited to know in what way diet helps in preventing osteoporosis?

A. you see, our bones are a giant storage of calcium. our body needs a very steady concentration of calcium, if it'll be low the body will take it form your bones. if there's too much- it'll either build bones (but only if he'll think he needs too- that is where sport get in the picture)or you'll urinate it.any way, you rather have large amount of calcium in your diet then less. but it's not enough- sport and other medication can help.

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