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Patella cubiti

Last revised by Dr Henry Knipe on 19 Mar 2018

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 1

Clinical presentation

May be asymptomatic or present with limitation of movement of the elbow 2

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 1

Differential diagnosis

  • non-union of an olecranon fracture
  • non-union of olecranon epiphysis has been documented in skeletally immature patients 4

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Cases and figures

  • Case 1
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  • Case 2
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