After primary patellar dislocation, redislocation rate up to 48% was reported. In adolescent age group recurrent patellofemoral instability is more common and in order to prevent from the long term effects of patellar dislocation, the predisposing factors must be identified and the treatment modalities must be decided accordingly. During lower extremity movement, there are four factors which effect the stabilization of the patella, these are; limb alignment, articular geometry, dynamic muscle forces and static ligament stabilizers. Injury or insufficiency of these anatomical structures predispose primary patellofemoral instability. Some risk factors were identified for recurrence after a primary patellar dislocation. Trochlear dysplasia, patella alta, tuberositas tibia-trochlear grove distance and patellar tilt are the major risk factors for recurrence. Clinicians should be aware of the effect of these risk factors for recurrence and the treatment should be planned properly.