Change of bone mineral density around knee joint and its influential factors after lateral meniscectomy

    LIU Yingª²Jie, GAO Shunª²Hong, BAI Junª²Qing

    Department of Orthopaedics, Affiliated Hospital, North China Coal Medical College, Tangshan 063000, China

    ¡¾Abstract¡¿ AIM: To investigate the change of bone mineral density around the knee joint and the influential factors for the change after lateral meniscectomy (LMT). METHODS: A total of 128 patients who had undergone LMT were divided into 0ª²1 year group, 2ª²4 year group, 5ª²10 year group and 11ª²17 year group according to the time after LMT; Healthy contralateral leg was assigned to control groups respectively. According to sex , operated age and weight, they were also divided into men group, women group ; ¡Ü40 years age, >40 years age ; ¡Ü75 kg, >75 kg. The bone mineral density in the 6 regions of interest (ROI) were measured using dual energy Xª²ray absorptiometry, and the sex, age, weight and the bone mineral density were analyzed by linear correlation. RESULTS: Bone mineral density in the 6 ROI were all decreased in 0ª²1 year group. They were decreased in R1ª²R4 significantly to 0.93¡À0.30, 0.91¡À0.21, 1.25¡À0.36 and 1.30¡À0.51 (P<0.01), respectively. In 2ª²4 year group , bone mineral density in R1ª² R4 were decreased, while it in R5 and R6 was increased. The value of changes in R1 and R3 were significant as 0.93¡À0.22 and 1.28¡À0.08 (P<0.01) . Except that bone mineral density in R2 was decreased, the values in the other regions were increased. The bone mineral density on lateral side increased significantly to 0.95¡À0.12, 1.20¡À0.19 and 1.25¡À0.18 (P<0.05). In 11ª²17 year group, bone mineral density in R1 and R3 was decreased as 0.93¡À0.20, 1.19¡À0.18. There was a significant difference in comparison with control groups respectively (P<0.05). CONCLUSION: Adaptive bone remodeling around the knee after LMT may result from many factors. ......