Patellar dislocations:
- lateral displacement is the most common
- tender with limited range of motion
- caused by sudden twisting movement, either with or without contact
- more common in females and young adolescents
- reduction by extension of the knee and medial pressure on the patella
- knee immobilizer and crutches with orthopedics or sports medicine follow up
- recurrent cases usually require surgery for definitive repair
References:
1. http://emedicine.medscape.com/article/90068-overview
2. New England Musculoskeletal Institute. http://nemsi.uchc.edu/clinical_services/orthopaedic/knee/patellar_dislocation.html