We found that patellar subluxation is not always happened only below 30years in clinic. It still occurred on aged people accompany with the degenerating symptoms, which always lead the miss diagnosis of patellar subluxation. We rechecked the anatomy , physical examination, and the articles about diseases related, and developed a set of easier way to diagnosis and treat by Chinese Orthopaedics and Traumatology manipulation that relieve the pain when flexion.