Patellar gouging refers to patellar resection, which may cause complications such as muscle atrophy, activity limitation and traumatic arthritis after the operation. 1. Muscle atrophy: when the patella is removed, the surrounding ligaments of the thigh muscles will be affected to some extent, and the amount of postoperative activities will be reduced, which will lead to muscle atrophy, which should be correctly carried out under the guidance of the doctor for functional exercises. 2. Activity limitation: post-patellectomy trauma can cause intra-articular soft tissue adhesion, which can lead to knee joint activity limitation, and can be prevented by active functional training to prevent peripheral joint activity obstruction. 3. Traumatic arthritis: after patellar resection, the stability of knee joint surface is affected, joint stability is weakened, and traumatic arthritis can be caused in the late stage, so attention should be paid to the protection of knee joint, reduce the weight of joints, and avoid strenuous exercise. When the patella is severely damaged, tumor invasion, uneven joint surface and severe chondromalacia patella, patellar resection may be needed to prevent the occurrence of osteoarthritis and deterioration of the condition. Therefore, attention should be paid to the protection of the patella in normal times, and if the trauma causes discomfort, timely medical treatment should be sought.