Abstract: A dynamic patellar brace useful for both diagnosis and treatment of patellar subluxation. The patellar brace includes a patellar bracing pad adapted to be positioned laterally with respect to the patella and to apply medial pressure to the patella to prevent subluxation for all normal ranges of knee flexion and motion. The patellar brace may be used to facilitate positive diagnosis of patellar subluxation whose symptoms may mimic other pathological problems of the knee and, therefore, lead to an erroneous diagnosis. The brace may also be used for treatment and/or to delay or avoid the need for corrective surgery.