The possible causes of knee tightness two months after patella surgery include postoperative local tissue adhesion, ligament fascia or muscle injury, and failure to perform correct functional exercises. 1. Tissue adhesion: knee tissue adhesion is one of the common complications after knee surgery, the main reason is the formation of abnormal local scar after knee surgery, resulting in reduced range of motion of the knee joint, or even impaired mobility, and you can feel the symptoms of knee tightness. 2. Ligament fascia or muscle injury: If the knee joint is seriously damaged before the operation, and the cruciate ligaments, meniscus and bones in the joint are seriously damaged, it will take a long time to recover from the operation such as patellar repositioning, patellar fixation and patellar osteotomy, so the symptom of tightness of the knee may still be present in the first two months after the operation. 3. Failure to carry out correct functional exercise: after patella surgery, need to carry out functional exercise under the guidance of professional doctors, so that the knee joint in the postoperative gradual recovery, such as knee bending exercise, ankle flexion and extension activities, thigh muscle exercise, etc., if you do not carry out these functional exercises, it may result in poor postoperative rehabilitation, knee tightness symptoms. Patella surgery two months knee tightness, it is recommended to go to the regular hospital in a timely manner to identify the cause, timely treatment.