Os patella cubiti

Patella cubiti is a very rare anomaly of the elbow, presenting as a sesamoid within the distal triceps brachii tendon. Its exact etiology is unknown with congenital, developmental and post-traumatic theories postulated .

Clinical presentation

May be asymptomatic or present with limitation of movement of the elbow .

Radiographic features

Plain radiograph
  • lateral elbow projection: has a similar appearance to the patella; well-corticated with smooth rounded edges with an otherwise normal elbow joint

Differential diagnosis

  • non-union of an olecranon fracture
  • non-union of olecranon epiphysis has been documented in skeletally immature patients
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