osteochondrosis

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osteochondrosis

 [os″te-o-kon-dro´sis]
a disease of the growth ossification centers in children, beginning as a degeneration or necrosis followed by regeneration or recalcification; known by various names, depending on the bone involved.
osteochondrosis defor´mans ti´biae tibia vara.

os·te·o·chon·dro·sis

(os'tē-ō-kon-drō'sis),
Any of a group of disorders of one or more ossification centers in children, characterized by degeneration or aseptic necrosis followed by reossification; includes the various forms of epiphysial aseptic necrosis.
[osteo- + G. chondros, cartilage, + -osis, condition]

osteochondrosis

/os·teo·chon·dro·sis/ (-kon-dro´sis) a disease of the growth ossification centers in children, beginning as a degeneration or necrosis followed by regeneration or recalcification; known by various names, depending on the bone involved.

osteochondrosis

[-kondrō′sis]
Etymology: Gk, osteon + chondros, cartilage, osis, condition
a disease affecting the ossification centers of bone in children. It is initially characterized by degeneration and necrosis, followed by regeneration and recalcification. Kinds of osteochondrosis include Legg-Calvé-Perthes disease, Osgood-Schlatter disease, and Scheuermann's disease.

osteochondrosis

Osgood-Schlatter disease, see there.

os·te·o·chon·dro·sis

(os'tē-ō-kon-drō'sis)
Any of a group of disorders of one or more ossification centers in children, characterized by degeneration or aseptic necrosis followed by reossification; includes the various forms of epiphysial aseptic necrosis.
[osteo- + G. chondros, cartilage, + -osis, condition]

osteochondrosis

See OSTEOCHONDRITIS.

osteochondrosis

group of bone disorders presenting during childhood, characterized by focal aseptic necrosis, fragmentation and distortion of overlying bone, with subsequent neo-ossification of affected area; named eponymously or topically, e.g. Freiberg's disease (of metatarsal head), Kohler's disease (of navicular), Osgood-Schlatter disease (of tibial tubercle), Sever's disease (of posterior leaflet of calcaneum (Table 1 and Table 2)
Table 1: Classifications of osteochondritis in the lower limb
Criterion 11. OC of the primary articular epiphysis (e.g. Freiberg's disease of the metatarsal head; Kohler's disease of the navicular)
2. OC of the secondary articular epiphysis (e.g. osteochondritis dissecans of the talus)
3. OC of the non-articular epiphysis (e.g. Osgood-Schlatter disease of the tibial tuberosity; Iselin's disease of the styloid process of the fifth metatarsal)
Criterion 21. Crushing apophysitis (e.g. Freiberg's disease) where the pressure of the base of the adjacent phalanx causes an 'eggshell fracture' of the affected metatarsal head
2. Traction or distraction apophysitis (e.g. Sever's disease; Iselin's disease; Osgood-Schlatter disease) where traction at the tendon insertion distracts a secondary centre of ossification from the body of the calcaneum, fifth metatarsal or tibia respectively
3. Fragmentation apophysitis (e.g. osteochondritis dissecans) in which the cortical bone overlying the enchondral defect fractures and separates to create a loose body within the joint
Two criteria may be used to classify osteochondritis:
• criterion 1 relates to the anatomical location of the enchondral ossification defect
• criterion 2 relates to the effects on the diseased bone brought about by the local forces that act on the bone.
Table 2: Presentations of osteochondritis/osteochondrosis in the leg and foot
OCSite affectedTypeAge of onset (years)
Blount's diseaseProximal tibial epiphysisUnderdevelopment of medial epiphysis1-3; 6-13
Buschke's diseaseCuneiformsOssification anomaly11-15
Freiberg's diseaseSecond/third metatarsal headCrushing OC12-18
Iselin's diseaseBase of fifth metatarsalTraction apophysitis11-15
Kohler's diseaseNavicularCrushing OC3-7
Legg-Calve-Perthe diseaseCapital femoral epiphysisTrue OC2-16
Osgood-Schlatter diseaseTibial tuberosityTrauma-related11-15
Osteochondritis dissecansTalar dome
Lateral femoral condyle of knee
Osteonecrosis12-18
Sever's diseaseCalcaneal apophysisTraction apophysitis10-14
Sinding-Larson-Johansson diseasePatellaTraction apophysitis10-14
Treve's diseaseSesamoids (1 MTPJ)True OC15-20

1 MTPJ, first metatarsophalangeal joint.

osteochondrosis

a disease characterized by abnormal differentiation of growth cartilage. Called also dyschondroplasia. It is a common disease in pigs and dogs and is also recognized in horses, turkeys and possibly in young bulls. The manifestations and sequelae vary with the species. In pigs osteochondrosis includes osteochondritis dissecans, epiphysiolysis deformities of bones and arthropathy. See also leg weakness.
Enlarge picture
Osteochondrosis of the shoulder. By permission from Kirberger RM, Wrigley RH, Barr F, Dennis R, Handbook of Small Animal Radiological Differential Diagnosis, Saunders, 2001

osteochondrosis and arthrosis
this disease of pigs causes severe degenerative lesions of the articular cartilage and underlying bone which are recognizable to autopsy but often without clinical signs. See also leg weakness.