Rate in the United States are estimated 2.3 per 100,000 per year. Rates for ages 10–17 were found to be about 29 per 100,000 persons per year, while the adult population average for this type of injury ranged between 5.8 and 7.0 per 100,000 persons per year. The highest rates of<unk>  were found in the youngest age groups, while the rates declined with increasing ages. Females are more susceptible to<unk> . Race is a significant factor for this injury, where Hispanics, African-Americans and Caucasians had slightly higher rates of<unk>  due to the types of athletic activity involved in: basketball (18.2%), soccer (6.9%), and football (6.9%), according to Brian Waterman. Lateral<unk>  is common among the child population. Some studies suggest that the annual<unk>  rate in children is 43/100,000. The treatment of the skeletally immature is controversial due to the fact that they are so young and are still growing. Surgery is recommended by some experts in order to repair the medial structures early, while others recommend treating it non operatively with physical therapy. If re-dislocation occurs then reconstruction of the medial patellofemoral ligament (MPFL) is the recommended surgical option.
Patellar dislocation
Patellar tendon rupture
Patella fracture
Knee dislocation  Knee dislocation  1
Knee dislocation
Acetabular fracture
Hip dislocation
Humerus fracture