 The prospective randomized study will be performed in patients after obtaining patients consent. Envelop drawing based on random table will decide the choice of approach. 1 Group 1: MIS-2, 30 cases 2 Group 2: MIS-WJ, 30 cases 3 Group 3: Mini-AL, 30 cases 4 Group 4: Mini-PL, 30 cases. Only the unilateral coxarthrosis will be recruited for the study. Analytical methods include 1 gait analysis 2 cybex study 3 balance test and obstacle crossing test 4 bone densitometry 5 PETS oxygen consumption and glucose utilization tests 6 inflammatory markers 7 clinical assessment 8 X-ray studies. Patients will be scheduled for specified examinations preoperatively, postoperatively and within 5 days, 2 weeks, 6 weeks, 3 months, 6 months, 12 months, 24 months, and 36 months. 