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

  • Masato Kiyohara
  • Satoshi HamaiEmail author
  • Daisuke Hara
  • Daisuke Fujiyoshi
  • Satoru Harada
  • Kenichi Kawaguchi
  • Yasuharu Nakashima
Original Article • HIP - ARTHROPLASTY



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.


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).


The component position or muscle strength did not significantly influence cup-head translation during gait after well-positioned primary THA.


Replaced hip Treadmill Hip offset Limb length discrepancy Hip abductor strength 



Source of funding: This work was supported by JSPS KAKENHI Grant No. (25870499) and a grant from the Nakatomi Foundation.


This study was funded by JSPS KAKENHI Grant No. (25870499) and a grant from the Nakatomi Foundation.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer-Verlag France SAS, part of Springer Nature 2019

Authors and Affiliations

  • Masato Kiyohara
    • 1
  • Satoshi Hamai
    • 1
    • 2
    Email author
  • Daisuke Hara
    • 1
  • Daisuke Fujiyoshi
    • 2
  • Satoru Harada
    • 1
  • Kenichi Kawaguchi
    • 1
    • 2
  • Yasuharu Nakashima
    • 1
  1. 1.Department of Orthopaedic Surgery, Faculty of Medical SciencesKyushu UniversityFukuokaJapan
  2. 2.Rehabilitation MedicineKyushu University HospitalFukuokaJapan

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