RT Book, Section A1 Kling, Mark P. A2 Reichman, Eric F. SR Print(0) ID 1159801796 T1 Patellar Dislocation Reduction T2 Reichman's Emergency Medicine Procedures, 3e YR 2018 FD 2018 PB McGraw-Hill Education PP New York, NY SN 9781259861925 LK accessemergencymedicine.mhmedical.com/content.aspx?aid=1159801796 RD 2024/11/06 AB Dislocation of the patella generally results from a traumatic event.1,2 It is most commonly due to a direct blow to the flexed knee. It may also occur from a forceful quadriceps contraction while the femur is internally rotated on the tibia with the foot planted (e.g., baseball, football, and soccer). Many patients may not notice the dislocation as it may spontaneously reduce immediately after the injury. There are numerous theories as to the predisposition to a patella dislocation (e.g., adolescents, age 10 to 30, anteverted femur, contracted iliotibial groove, excessive patellar lateral tilt, family history of patella dislocation, females, flat intercondylar groove, joint laxity, “knock-knees” or genu valgus, hypoplastic femoral condyle, large Q-angles, ligamentous laxity, obesity, patella alta, patellar hypermobility, physical activity, shallow intercondylar groove, and vastus medialis muscle atrophy).3-6 This condition is most commonly seen in adolescents and females.7,8