Lateral collateral ligament calcification

Last revised by Dr Bahman Rasuli on 12 Apr 2022

Lateral collateral ligament calcification is rare that can cause acute knee pain.

Clinical presentation

Most patients with lateral collateral calcification are asymptomatic while a small proportion will have lateral knee pain.

Radiographic features

Plain radiograph

Calcification is adjacent to the lateral femoral condyle, often linear or curvilinear in shape and paralleling the femoral cortex.


It appears as a low signal lesion in the lateral collateral ligament in comparison with the high attenuation area on the plain radiograph and may be associated with surrounding soft tissue edematous changes 1.

Treatment and prognosis

The management is usually conservative.

Differential diagnosis

Post-traumatic calcification changes and crystal-induced arthropathies (calcium pyrophosphate deposition and gout) are in differential diagnosis 2.

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Cases and figures

  • Case 1: lateral collateral ligament calcification - knee
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