Do component position and muscle strength affect the cup-head translation during gait after total hip arthroplasty?

Masato Kiyohara, Satoshi Hamai, Daisuke Hara, Daisuke Fujiyoshi, Satoru Harada, Kenichi Kawaguchi, Yasuharu Nakashima

Research output: Contribution to journalArticlepeer-review

Abstract

Introduction: This study examined whether the component position or muscle strength affects the cup-head translation under in vivo weight-bearing conditions after total hip arthroplasty (THA). We hypothesized that there was a correlation between the hip offset or abductor strength and cup-head translation during gait. Materials and methods: We prospectively evaluated 31 patients undergoing unilateral cementless primary THA. The cup height, cup/stem offset, and limb length discrepancy were measured on anterior–posterior bilateral hip radiographic images. The isometric muscle strength of the lower limbs was quantified using a handheld dynamometer. Continuous radiographic images were recorded during gait, and cup-head translation was analysed using a computer-assisted method. Results: The average cup height, cup/stem offset, and limb length discrepancy were − 3.8 ± 5.1 mm, 1.2 ± 5.2 mm/− 0.7 ± 7.7 mm, and − 2.1 ± 5.2 mm, respectively. The average hip abductor/flexor and knee extensor strength were 86% ± 18%/85% ± 17% and 88% ± 17% of the contralateral healthy hip, respectively. The average cup-head translation during swing phase of gait was − 0.003 ± 0.31 mm. Multiple regression analyses found no significant independent predictors of cup-head translation (p > 0.05). Conclusions: The component position or muscle strength did not significantly influence cup-head translation during gait after well-positioned primary THA.

Original languageEnglish
Pages (from-to)1263-1269
Number of pages7
JournalEuropean Journal of Orthopaedic Surgery and Traumatology
Volume29
Issue number6
DOIs
Publication statusPublished - Aug 1 2019

All Science Journal Classification (ASJC) codes

  • Surgery
  • Orthopedics and Sports Medicine

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