Abstract
Introduction: The instability of the joint is classified roughly into mechanical and functional. It is reported that the postoperative dislocation often occurs by the posterior approach of the THA and may be caused by functionality instability due to the injury of the periarticular soft tissue. We analyzed the joint position sense of the hip according to an approach of the THA and examined effect to give postoperative dislocation. Materials & Methods: 92 patients (184 hip joints) who received THA in our hospital were selected in the study. Cases in which position sensation measurements were insufficient were excluded. As for the classification, the posterior approach (PL groups) was 39 hips, anterolateral approach (AL groups) was 30 hips, and control group was 37 hips. Results: There was no significant difference between the AL group and PL group in the absolute reproduction angle error score (ARAES). The relative reproduction angle error scores (RRAES) for passive internal and external rotations and active internal rotation were significantly lower in the AL and control groups than the PL group. Discussion: This study was suggested that the hip joint position sense in the AL group was better retained for the preservation of the soft tissue.
Highlights
IntroductionIt is reported that the postoperative dislocation often occurs by the posterior approach of the total hip arthroplasty (THA) and may be caused by functionality instability due to the injury of the periarticular soft tissue
The instability of the joint is classified roughly into mechanical and functional
There was no significant difference between the AL group and posterolateral approach (PL) group in the absolute reproduction angle error score (ARAES)
Summary
It is reported that the postoperative dislocation often occurs by the posterior approach of the THA and may be caused by functionality instability due to the injury of the periarticular soft tissue. We analyzed the joint position sense of the hip according to an approach of the THA and examined effect to give postoperative dislocation. There are two types of joint instability: one is mechanical instability due to the disruption of anatomical structures of the hip joints and the other one is functional instability due to insufficient proprioception (joint position sense and kinesthetic sense) [1] [2]. Mechanical instability [3] may be important as contributing factors of dislocation, the fact that some dislocations occur more than 10 years after operation indicates that the cause of dislocation is mechanical factors and functional instability due to disruption of joint proprioception [4] [5]. We analyzed the joint position sense in patients treated by THA through different approach and examined if there were any differences between the two surgical approaches in the hip joint position sense
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