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Abstract Objective To observe the clinical effect of arthroscopic assisted treatment of acute posterior medial angle injury.Methods From April 2017 to March 2018，12 patients with acute posterior medial corner injury of knee joint were treated with knee arthroscopy due to trauma，among which 7 were males and 5 were females，aged 22~71 years old，with an average of 46.8 years old.Preoperative MRI showed the injury of medial collateral ligament.Physical examination knee flexion during and 30°﹑0° valgus stress test were all positive.Intraoperative arthroscopic exploration was performed to identify the posterior medial corner of the knee.All 12 cases were treated by medial meniscus posterior keratoplasty or suture，medial collateral ligament and posterior medial Angle anchoring.The knee function score (Lysholm and WOMAC) and VAS pain score were used to measure the knee flexion angle and evaluate the knee function at the 6th month after surgery.Results Knee flexion and extension activities were good，and there were no symptoms of periarticular redness and instability.Preoperative WOMAC score (22.52±19.99) and postoperative score (8.13±7.22) showed statistically significant differences between the two groups (P＜0.05).Preoperative Lysholm score (33.81±5.45) and postoperative score (81.83±4.08) were significantly different between the two groups (P＜0.05)，VAS pain score (4.1±0.5) and postoperative score (2.3±0.2).Preoperative flexion angle (85.95±8.80)°，and postoperative flexion angle (115.73±6.71)° were statistically difference (P＜0.05).Conclusion The injury of medial meniscus can be treated under arthroscopy，and assisted incision and repair of the posterior medial angle.which has the advantages of safety，stability and stability，and the well restored function of the knee joint.
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