Pediatric Lateral Patellar Retinacular Sleeve Avulsion.

A 10-year-old girl presented to the physical therapist with acute left knee pain, after sprinting that morning. She reported a pop and lateral knee pain, which caused her to stop her run. The physical therapist referred the patient for radiographs that day, which showed a possible lateral patellar avulsion. Magnetic resonance imaging was performed the following day, given the poor accuracy of radiographs in patellar avulsions, which confirmed a lateral patellar retinacular sleeve avulsion. J Orthop Sports Phys Ther 2017;47(10):815. doi:10.2519/jospt.2017.6616.