Introduction: The instability of the joint is classified roughly into mechanical\nand functional. It is reported that the postoperative dislocation often occurs\nby the posterior approach of the THA and may be caused by functionality instability\ndue to the injury of the periarticular soft tissue. We analyzed the joint\nposition sense of the hip according to an approach of the THA and examined\neffect to give postoperative dislocation. Materials & Methods: 92 patients\n(184 hip joints) who received THA in our hospital were selected in the study.\nCases in which position sensation measurements were insufficient were excluded.\nAs for the classification, the posterior approach (PL groups) was 39\nhips, anterolateral approach (AL groups) was 30 hips, and control group was\n37 hips. Results: There was no significant difference between the AL group\nand PL group in the absolute reproduction angle error score (ARAES). The\nrelative reproduction angle error scores (RRAES) for passive internal and external\nrotations and active internal rotation were significantly lower in the AL\nand control groups than the PL group. Discussion: This study was suggested\nthat the hip joint position sense in the AL group was better retained for the\npreservation of the soft tissue.
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