Os trigonum | definition of os trigonum by Medical dictionary
Also found in: Dictionary
os tri·go·num [TA]
an independent ossicle sometimes present in the tarsus; usually it forms part of the talus, constituting the lateral tubercle of the posterior process.
a small foot bone just posterior to the talus. It is sometimes confused with a fracture of the posterior tubercle of the talus. Also called Bardeleben's bone
os tri·go·num (os trī-gō'nŭm) [TA]
An independent ossicle sometimes present in the tarsus; usually it forms part of the talus, constituting the lateral tubercle of the posterior process.
Synonym(s): triangular bone
os trigonum triangular accessory ossicle (fused to or separate from centre of posterior margin of talus/superior angle of calcaneum), formed as non-union of a separate centre of ossification; an enlarged, fully calcified os trigonum may cause posterior heel pain, as it prevents end-range ankle joint plantarflexion
References in periodicals archive
Os trigonum sendromunun nadir goruldugu vurgulanmakla birlikte bu konuyla ilgili yeterli epidemiyolojik veriler bulunmamaktadir.
Sol ayak bilegi lateral radyografisinde os trigonum goruldu (Sekil 1).
4) When the os trigonum
is the cause, the condition is known as os trigonum
An os trigonum
is usually round or oval with well-defined corticated margins, whereas a fracture of the lateral tubercle typically has irregular serrated margins between the fragment and the posterior talus.
37) Posterior tibiotalar impingement syndrome (PTTIS) can occur in the presence of an os trigonum
(Figure 20), a prominent stieda process, or hypertrophy of the transverse ligament (the inferior portion of the PTFL).
The os trigonum
is the second most common extra bone in the foot and ankle.