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Midsubstance oblique retinacular ligament rupture
10%
390/3983
Soft-tissue avulsion of medial patellofemoral ligament
58%
2317/3983
Midsubstance medial patellofemoral ligament rupture
21%
817/3983
Partial quadriceps tendon rupture
2%
84/3983
Bony avulsion of medial patellofemoral ligament
9%
352/3983
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The most common site of medial patellofemoral ligament (MPFL) injury is a soft-tissue avulsion injury of the ligament. Both midsubtance and soft tissue avulsions are more common than bony avulsions. Bony avulsion off the patella can occur as well, and according to the referenced study by Torisuka et al, the MPFL remains attached to the medial patellar fragment and excellent clinical and radiographic results can occur with open reduction and fixation with suture anchors. The reported study by Nomura et al reported that MRI is >80% sensitive and >80% specific (regarding location) for detecting MPFL injuries as well as their location. In addition, they noted a 96% MPFL injury rate with patellar dislocation.
3.2
(25)
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