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Abstract Objective To investigate the clinical efficacy of Oxford mobile platform monocondyle arthroplasty in the treatment of spontaneous osteonecrosis of the knee.Methods From January 2017 to July 2021，30 patients with spontaneous osteonecrosis of the knee underwent unicompartmental knee arthroplasty.7 males and 23 females were included.The patients age from 62 to 80 years，with an average of (70.20±4.39)years.There were 11 cases of left knee and 19 cases of right knee.The patients were diagnosed and staged by Xray and MRI before operation.The functional and pain of knee joint and the improvement of lower limb alignment at the last followup were recorded and evaluated.Results All patients were followed up for 12 to 36 months，with an average of (26.43±7.18)months.The visual analogue score was (6.63±1.07) before operation and (1.17±0.95) at the last follow-up after operation(P＜0.05)，and the difference was statistically significant.The American Hospital for Special Surgery knee score was (63.03±5.76) before operation and (93.33±2.81) at last followup.The Oxford knee score was (44.07±3.05) before operation and (21.37±2.91) at last follow-up (P＜0.05)，and the difference was statistically significant.The knee function was significantly improved，with all of them were excellent.The maximum range of motion was (120.73±3.89)° before operation and (121.43±2.74)° at the last follow-up(P＞0.05)，and the difference was not statistically significant.Tibial femur angle was (178.6±1.98)°preoperatively and (174.8±0.71)° postoperatively (P＜0.05)，and the difference was statistically significant.The lower limb alignment was corrected.The posterior Angle of tibial plateau was (6.9±1.06)° before operation and (7.2±0.55)° at the last follow-up(P＞0.05).The difference was not statistically significant.Conclusion Oxford mobile platform monocondylar replacement for spontaneous osteonecrosis of the knee has the advantages of preserving more bone mass，less soft tissue trauma，less bleeding，rapid proprioceptive recovery，better functional recovery and fewer complications after lower extremity line surgery.The clinical efficacy is satisfactory.
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Corresponding Authors:
Zhu Wei
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