trigonum


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triangle

 [tri´ang-g'l]
a three-cornered object, figure, or area, such as a delineated area on the surface of the body; called also trigone.
carotid triangle, inferior that between the median line of the neck in front, the sternocleidomastoid muscle, and the anterior belly of the omohyoid muscle.
carotid triangle, superior carotid trigone.
cephalic triangle one on the anteroposterior plane of the skull, between lines from the occiput to the forehead and to the chin, and from the chin to the forehead.
digastric triangle submandibular triangle.
Einthoven's triangle an imaginary equilateral triangle with the heart at its center, formed by the axes of the three bipolar limb leads.
Einthoven's triangle. Bipolar limb leads I, II, and III form Einthoven's triangle. Other standard positions for electrocardiographic leads are the augmented unipolar leads: aVR (right arm), aVL (left arm), and aVF (left leg). From Polaski and Tatro, 1996.
triangle of elbow a triangular area on the front of the elbow, bounded by the brachioradial muscle on the outside and the round pronator muscle inside, with the base toward the humerus.
triangle of election superior carotid triangle.
facial triangle a triangular area whose points are the basion and the alveolar and nasal points.
femoral triangle the area formed superiorly by the inguinal ligament, laterally by the sartorius muscle, and medially by the adductor longus muscle; called also Scarpa's triangle.
infraclavicular triangle that formed by the clavicle above, the upper border of the greater pectoral muscle on the inside, and the anterior border of the deltoid muscle on the outside.
inguinal triangle the triangular area bounded by the inner edge of the sartorius muscle, the inguinal ligament, and the outer edge of the long adductor muscle.
lumbocostoabdominal triangle that lying between the external oblique muscle of the abdomen, the posterior inferior serratus muscle, the erector muscle of the spine, and the internal oblique muscle of the abdomen.
occipital triangle the area bounded by the sternocleidomastoid muscle in front, the trapezius muscle behind, and the omohyoid muscle below.
Scarpa's triangle femoral triangle.
subclavian triangle a triangular area bounded by the clavicle, the sternocleidomastoid muscle, and the omohyoid muscle.
suboccipital triangle that lying between the posterior greater rectus muscle of the head and the superior and inferior oblique muscles of the head.

tri·go·num

, pl.

tri·go·na

(trī-gō'nŭm, -nă), [TA]
Any triangular area. See: triangle.
Synonym(s): trigone (1) [TA]
[L., fr. G. trigōnon, a triangle]

trigonum

/tri·go·num/ (tri-go´num) pl. trigo´na   [L.] triangle.

tri·go·num

, pl. trigona (trī-gō'nŭm, -nă) [TA]
Any triangular area.
See also: triangle
Synonym(s): trigone (1) .
[L., fr. G. trigōnon, a triangle]

os

bone; osseous tissue, made up of a dense outer layer of compact cortical bone covered by vascular periosteum, and inner trabeculated bone, which in long bones is filled with marrow see also Table 1
Table 1: Accessory bones in the foot
Accessory bone in the footLocation
Os tibiale externum (accessory navicular)Within tibialis posterior tendon, adjacent to proximal part of navicular tuberosity
Os trigonumPosterior margin of talus
Os peroneumWithin peroneus longus tendon, adjacent to inferior lateral border of cuboid/calcaneocuboid joint
Os vesalianumAdjacent to fifth metatarsal base
Os intermetatarseumBetween bases of first and second metatarsals
Os interphalangeusWithin insertion of flexor hallucis longus tendon, adjacent to plantar area of hallux interphalangeal joint

trigonum

pl. trigona [L.] trigone or triangle.
References in periodicals archive ?
Stenosing tenosynovitis of the flexor hallucis longus tendon and posterior impingement upon the os trigonum in ballet dancers.
However, the presence of an os trigonum might be a contributing factor in the patient's pain and dysfunction in this case.
Os trigonum sendromu ile ilgili yayinlanan olgu serileri ve calismalarda hastaligin erkek veya kadinlarda gorulme sikligi acisindan bir farkliliga rastlanmamistir.
The posterior-ankle impingement due to os trigonum can develop after disruption of the os trigonum through a significant acute injury (for example, fracture, fragmentation, and/or pseudoarthrosis).
6) However, impressed by the endoscopic overview of the hindfoot pathology and the resulting insights into the intimate relationship between the os trigonum and the FHL tendon, and after extensive training, the endoscopic approach was adopted as standard treatment in our clinic in 2002.
Diagnosis is clinical for the most part, but plain x-ray films may confirm the presence of an os trigonum.
The os trigonum is corticated and articulates with the lateral talar tubercle through a synchondrosis.
Foraging versatility and the influence of host availability in Argyrodes trigonum (Araneae, Theridiidae).
Howse in 1972 was the first author to describe os trigonum syndrome in dancers and the result of surgical treatment: "excision of the extra bone relieves the symptoms.
19-21) Stenosing tenosynovitis can also be associated with an os trigonum.
It occurs in 8 to 10 percent of the general population, with a 50 percent chance of it occurring in both ankles if you already have one os trigonum.
This study is a retrospective case series of 40 ankles in 38 dancers who underwent os trigonum excision via an open posteromedial approach with FHL tenolysis between 2000 and 2013.