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Updated: Jan 25, 2026
Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
Published on: February 27, 2018
Do component position and muscle strength affect the cup-head translation during gait after total hip arthroplasty?
Masato Kiyohara1, Satoshi Hamai2,3, Daisuke Hara1
1Department of Orthopaedic Surgery, Faculty of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
Insights
Component position and muscle strength do not significantly impact cup-head translation after total hip arthroplasty (THA). This study found no correlation between hip offset, abductor strength, and cup-head movement during gait in well-positioned THA patients.
Area of Science:
- Orthopedic Surgery
- Biomechanical Engineering
- Radiology
Background:
- Assessing factors influencing cup-head translation after total hip arthroplasty (THA) is crucial for long-term implant success.
- Understanding the interplay between component positioning and muscle strength in vivo is essential for optimizing THA outcomes.
Purpose of the Study:
- To investigate the influence of component position (cup height, offset) and muscle strength on cup-head translation during weight-bearing gait after primary THA.
- To test the hypothesis that hip offset or abductor strength correlates with cup-head translation during gait.
Main Methods:
- Prospective evaluation of 31 patients undergoing unilateral cementless primary THA.
- Radiographic measurements of cup height, cup/stem offset, and limb length discrepancy.
- Quantification of lower limb isometric muscle strength using a handheld dynamometer and analysis of cup-head translation during gait via continuous radiographic imaging.
Main Results:
- Average cup height, cup/stem offset, and limb length discrepancy were measured.
- Hip abductor/flexor and knee extensor strength were approximately 86% and 88% of the contralateral healthy hip, respectively.
- No significant independent predictors of cup-head translation were identified through multiple regression analyses (p > 0.05).
Conclusions:
- Component position and muscle strength do not significantly affect cup-head translation during gait in patients with well-positioned primary THA.
- These findings suggest that other factors may play a more critical role in cup-head translation dynamics post-THA.
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.
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