Pediatric emergency medicine trisk 0839 0839
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b Common
causes of the injured knee.
Patellar dislocation occurs as the quadriceps muscles pull the patellar tendon to
extend the knee, especially when the knee has a valgus stress or the extremity is
suddenly abducted when the leg slips laterally. If the vastus medialis fibers do not
keep the patella in the intercondylar groove, the patella may dislocate laterally.
This injury rarely occurs from direct force but more commonly from a noncontact
twisting injury. The patient may feel a popping sensation with intense pain and
present with the knee flexed. The patella will be displaced laterally, and the
diagnosis is usually made based on history and examination. The dislocation may
be reduced before radiographs are taken. Postreduction radiographs should be
obtained to rule out an associated avulsion or osteochondral fracture of the
patella. Patellar dislocations are often recurrent.
