title: Arthroscopic characteristics of meniscal injuries in osteoarthritic knees.
abstract: OBJECTIVE
  The aim of this study was to investigate the arthroscopic characteristics of meniscal injuries in osteoarthritic knees and explore their significance in the selection of surgical approach.
  
  
  METHODS
  Four original types of meniscal injuries were defined. The study included 87 cases; 12 Type 1, 26 Type 2, 35 Type 3 and 14 in Type 4 meniscal injuries. For Type 1 injuries, 5 cases underwent meniscal suture repair and 7 cases partial meniscal resection. Partial meniscal resection was performed in 22 cases and subtotal resection in 4 cases of Type 2 injury. For Type 3 injury, meniscal debridement was performed in 2, partial resection in 8, subtotal resection in 19 and total resection in 6 cases. For Type 4 injury, 3 cases underwent subtotal resection and 11 underwent total resection. Patients were evaluated with the Lysholm, visual analog scale, and Kellgren-Lawrence scale scores and cartilage lesions stages.
  
  
  RESULTS
  Mean follow-up period was 26 (range: 8 to 51) months. Joint swelling or pain was present in 13 cases after fatigue. Twist lock symptom was observed in one Type 3 injury and one Type 4 injury. Joint flexion was limited to 20° in one Type 3 injury and two Type 4 injuries. Total knee joint replacement was performed in two Type 2 and two Type 4 injuries 2 to 3 years and 2 months after surgery.
  
  
  CONCLUSIONS
  The classification of meniscal injuries in osteoarthritic knees was designed to guide arthroscopic surgery and improve the therapeutic efficacy of minimally invasive surgery for knee osteoarthritis.
authors.affiliation: Department of Sports Medicine, East Hospital, Tongji University School of Medicine, Shanghai, China.
authors.forename: Jinglong
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Sports Medicine, East Hospital, Tongji University School of Medicine, Shanghai, China.
authors.forename: Liangyu
authors.initials: L
authors.lastname: Lu
authors.affiliation: Department of Sports Medicine, East Hospital, Tongji University School of Medicine, Shanghai, China.
authors.forename: Wenhui
authors.initials: W
authors.lastname: Zhu
authors.affiliation: Department of Sports Medicine, East Hospital, Tongji University School of Medicine, Shanghai, China.
authors.forename: Dongliang
authors.initials: D
authors.lastname: Shi
authors.affiliation: Department of Sports Medicine, East Hospital, Tongji University School of Medicine, Shanghai, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Zhan
authors.affiliation: Department of Sports Medicine, East Hospital, Tongji University School of Medicine, Shanghai, China.
authors.forename: Yubin
authors.initials: Y
authors.lastname: Wang
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000379:methods; D001182:Arthroscopy / Q000379:methods; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008592:Menisci, Tibial / Q000000981:diagnostic imaging / Q000601:surgery*; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000175:diagnosis* / Q000601:surgery*; D011859:Radiography; D012189:Retrospective Studies; D012720:Severity of Illness Index; D000070600:Tibial Meniscus Injuries; D016896:Treatment Outcome