Patellar luxation is the dislocation of the patella. The patellar ligament connects the patella to the tuberosity of the tibia. Complications may include patellar tendon rupture. Patellar tendon rupture must be treated surgically. The patellar ligament can be injured in a patellar tendon rupture. In the knee the quadriceps and patellar tendon can sometimes tear. Quadriceps weakness and muscle imbalance may contribute to abnormal patellar tracking. Lin recovered from a patellar ligament injury to his knee during the 2011 NBA lockout. However, tight and strong lateral quadriceps can be an underlying cause of patellar dislocation. The thumbs are placed along the joint line on either side of the patellar tendon. Patellar luxation can affect either or both legs. On November 29, 2015, Graham suffered a torn right patellar tendon. It may be complicated by patellar tendonitis. It creates an attachment point for the ligamentum patellae, or patellar ligament. Patellar luxation affects 6.2% of Bulldogs.