Hoffa's Fat Pad Impingement (HFPI)

Inclusion Criteria: * Clinical diagnosis of HFPI (defined as pain to palpation over the medial or lateral aspect of the infrapatellar fat pad, and/or positive hoffa test which is performed by exerting direct pressure over the infrapatellar fat pad as the knee is passively moved from flexion to extension; pain is positive hoffa test) * Age 12-18 years * Patients who identify as female * Organized sports participation is defined as any adult-led game or sport in which three or more people play and/or practice together regularly in a league or association or an adult-led individual athletic activity. Non-organized sport is excluded such as free play. * Xray and non-contrast MRI of the knee must have been completed for the symptomatic knee * Must have completed physician-prescribed course of physical therapy for 6-8 weeks Exclusion Criteria: * History of patellar dislocation or subluxation, Ehlers-Danlos syndrome, patellar tendinitis/tendinosis, quadriceps tendinitis/tendinosis, medial plica syndrome, osteochondritis dessicans (OCD) of the knee, knee osteoarthritis, prior knee surgery * Other concurrent knee derangement such as meniscus or ligament tears * Radiographic evidence of bony abnormalities other than lateral patellar tilt, patella alta/baja, trochlear dysplasia * MR positive for internal knee joint derangement, synovitis/inflammatory changes/effusion, OCD * Patients receiving other knee injections during the study time period (i.e., viscosupplementation injection, Toradol injection)