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We reviewed thirty patients with degenerative posterior root tear of the medial meniscus to investigate clinical results of non-operative treatment retrospectively. There were 3 men and 27 women at a median age of 59 years old (range, 51-65). The median follow-up period was 36 months (range, 24-51). Non-operative treatments included non-steroidal anti-inflammatory drugs daily for 8-12 weeks and supervised physical therapy twice a week at least during a period of 8 weeks. The symptoms, physical signs, the Visual Analog Scale pain, the Lysholm Knee Scoring scale and IKDC subjective activity level were analyzed at the time of pre-intervention, 6 months, 12 months and the final follow-ups. Most patients had intense mechanical pain initially, but the severity and frequency of pain was decreased within 3 months. Clinical outcome was improved at 12 months follow-up and then declined to a level that was still improved over initial scores at final follow-up. Two patients with Kellgren-Lawrence grade 2 progressed to grade 3 at the median follow-up of 36 months. In conclusion, this study demonstrated that non-operative treatment provided symptomatic relief in most patients with the degenerative posterior root tear of the medial meniscus and functional improvements in a short term follow-up.