Corpus: Os trigonum
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Synonyms: Os tali secundarium, Os intermedium tarsi
English:
Definition[Bearbeiten]
In anatomy, the Os trigonum is an accessory bone at the dorsal end of the talus.[1]
Anatomy[Bearbeiten]
The corpus tali is divided into the trochlea tali and the processus posterior tali. The latter usually has a lateral tubercle, which also marks the dorsal end of the talus. An independent lateral tuberosity occurs as a variety, which is then referred to as the os trigonum.[1]
Epidemiology[Bearbeiten]
The ossicle usually forms between the ages of 7 and 13 and fuses with the talus in most individuals by the age of about 17, otherwise it remains as the os trigonum. In adults, the incidence is between 3 and 15 %, with bilateral occurrence detectable in approx. 2 % of cases.[2]
Clinical[Bearbeiten]
The Os trigonum can lead to load-dependent or even permanent pain. In this case, it is referred to as Os trigonum syndrome.[2]
Differential diagnoses[Bearbeiten]
Radiologically, the Os trigonum should not be confused with an avulsion fracture of the lateral tuberosity of the talus (Shepherd fracture).
Sources[Bearbeiten]
- ↑ 1,0 1,1 "Taschenatlas Anatomie 1, Bewegungsapparat" - Werner Platzer, Thieme-Verlag, 10th edition
- ↑ 2,0 2,1 Reading sample "Unfallchirurgische Klinik" - Zeichen et. al., Springer-Verlag