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Abstract Objective Joint instability can be roughly divided into mechanical instability and functional instability.It is reported that postoperative dislocation often occurs in the posterior approach，may be due to injury of soft tissue around the joints，that caused functional instability.We analyzed the location sense of hip joints with different approaches for total hip arthroplasty and analyzed their effects on postoperative dislocation.Methods Fifty-eighty patients (116 hips)，who received THA in our hospital were admitted to our study.Patients with inadequate sensory measurements were excluded.The posterior approach involved 39 hip.There were 30 hip underwent anterolateral approach procedure，and 37 hip in the control group.Results The absolute reduction angle error of the active external rotation in the Al group is significantly lower than that in the PL group.In the AL group and the control group，the relative reduction angle of the passive internal rotation，external rotation and active internal rotation was significantly lower than that of the PL group.Conclusion This study shows that the patient has a better hip position sense in the anterolateral approach group due to the retention of soft tissue around the joint.
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