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Carol C. Hasler and Daniel Studer

–flexion–external rotation, occurs in more than 80% of primary patellar dislocations. Spontaneous patellar dislocation is common in skeletally immature girls, and locked dislocation is common in skeletally mature men. 4 Many patients report that they felt the patella

Stéphane Armand, Geraldo Decoulon, and Alice Bonnefoy-Mazure

(loading response) • Quadriceps weakness or patella pain  ◦ Reduced knee extensor moment (stance) Knee hyper extension (mid-stance) • Quadriceps weakness • Plantarflexors overactivity or contracture  ◦ Excessive ankle plantarflexion