Jul 31, 2024 · The os trigonum (plural: ossa trigona) is one of the ossicles of the foot and can be mistaken for a fracture. It sits posterior to the talus on the lateral foot radiograph and represents a failure of fusion of the lateral tubercle of the posterior process.

Jan 3, 2025 · Lower Extremity Os are secondary ossification centers that remain separated from the normal bone and may be confused with a fracture. Diagnosis requires plain radiographs of the foot and ankle. Treatment is generally observation as most are completely asymptomatic.

Nov 9, 2022 · Os trigonum syndrome (posterior ankle impingement) can affect people with an extra bone behind the ankle called the os trigonum. Injury or repetitive stress can lead to ankle pain and stiffness. It’s more common in runners, dancers and soccer players.

The Os Trigonum Syndrome refers to pain posterior of the ankle and reduced plantarflexion caused by “the nutcracker-phenomenon”. When an os trigonum is present, this accessory ossicle together with surrounding soft tissues can become wedged between the tibia, talus and calcaneus.

The os trigonum is an extra (accessory) bone that sometimes develops behind the ankle bone (talus). It is connected to the talus by a fibrous band. The presence of an os trigonum in one or both feet is congenital (present at birth).

Symptoms of os trigonum syndrome include a deep pain in the back of the ankle aggravated mostly when the foot is plantarflexed (toes bending downwards). An example would be walking down steep stairs or performing point in ballet.

The talus bone of the ankle joint connects the leg to the foot. The head of talus looks forward and medialward ; its anterior articular or navicular surface is large, oval, and convex. Its inferior surface has two facets, which are best seen in the fresh condition.

Os Trigonum Syndrome (OTS) is a condition that affects the posterior ankle, often causing pain and discomfort in the lower leg. This syndrome occurs when a small, extra bone—called the os trigonum—fails to fuse with the talus during development.

Os trigonum syndrome, sometimes called posterior ankle impingement syndrome (PAIS), is a potentially underrecognized condition and cause of posterior ankle pain. This has been increasing in clinical practice secondary to awareness, increased interest in physical fitness and the use of exercise machines.

Posterior Ankle Impingement is characterized by pain behind the ankle joint. Symptoms are exacerbated by pointing the toes in a forced position.