Medial patellofemoral ligament avulsion injury
Discussion:
This case illustrates typical findings in previous lateral patellar dislocation:
- medial patellofemoral ligament injury with a patellar avulsion fracture and a tear of the femoral origin
- bone bruises at the typical locations at the inferomedial patella and the anterolateral margin of the lateral femoral condyle
- a tear of the medial retinaculum
- a myotendinous tear of the vastus medialis oblique (VMO) muscle
It also reviews imaging assessment for patella alta, trochlear dysplasia and increased TT-TG distance which are predisposing factors for patellofemoral instability.
Surgical repair of bone avulsion injuries after prior lateral patellar dislocation is recommended 7, especially in patients with risk factors and was done in this patient.
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