Hip resurfacing arthroplasty in women - A novel ceramic device enables near normal gait function

Q: What research question does the study address?

It examines whether female cHRA patients differ in gait function from female THA patients using both subjective PROMs and objective gait measures.

Q: How were gait outcomes measured?

PROMs were collected (Oxford Hip Score, EQ5d, MET score), and patients underwent instrumented treadmill gait analysis pre- and post-operatively to record walking speed and ground reaction force metrics.

Q: What were the main post-operative findings comparing cHRA and THA?

Post-operatively, cHRA had a higher MET score and different spatiotemporal and ground reaction force patterns than THA, with results closer to healthy controls.

Sep 21, 2026

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Female gait function after hip surgery often improves but may not reach healthy levels. This study compares 15 unilateral ceramic hip resurfacing arthroplasty (cHRA) patients with 15 unilateral total hip arthroplasty (THA) patients, matched by age and BMI, using PROMs and instrumented treadmill gait analysis pre-operatively and at 52–74 weeks. No pre-operative differences were found; post-operatively cHRA showed higher MET and maximum walking speed and a gait profile closer to healthy controls, while THA exhibited reduced push-off and asymmetry at faster speeds.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages6

Reading Time15 min

AccessFree to download

Introduction

Background and rationale

Study question and approach

Gait & Posture 103 (2023) 166–171 Contents lists available at ScienceDirect Gait & Posture journal [homepage:](homepage: www.elsevier.com/locate/gaitpost)[ www.elsevier.com/locate/gaitpost](homepage: www.elsevier.com/locate/gaitpost) | Hip resurfacing arthroplasty in women: A novel ceramic device enables near normal gait function | | | | | --- | --- | --- | --- | | Amy Masliveca, *, Camilla Halewood b, Susannah Clarke a, b, Justin Cobb a, b
a Imperial College London, Sir Michael Uren Hub, 86 Wood Lane, London W12 0BZ, UK b Embody Orthopaedic Limited, Sir Michael Uren Hub, 86 Wood Lane, London W12 0BZ, UK | | | | | A R T I C L E I N F O | | A B S T R A C T | | | Keywords:
Gait
Hip Resurfacing Arthroplasty Total Hip Arthroplasty MET score
Ground Reaction Force | | Background: Gait function improves after Total Hip Arthroplasty (THA) but is not restored to normal levels. Metal-on-metal Resurfacing Arthroplasty (MoM-HRA) is an alternative to THA and has shown to restore normal levels gait function and physical activity but has been restricted to men owing to problems of metal-ion release. Ceramic HRA (cHRA) removes the cobalt-chrome bearing surfaces, thereby eliminating these specific metal-ion concerns and aiming to be safe for females.
Research question: Is there a difference in gait function of female cHRA patients compared to female THA using subjective and objective measures?
Methods: Fifteen unilateral cHRA and 15 unilateral THA, age and BMI matched, completed patient reported outcome measures (PROMs) (Oxford Hip Score, EQ5d and MET score) and underwent gait analysis using an instrumented treadmill pre- (2–10 weeks) and post-operatively (52–74 weeks). Maximum walking speed (MWS), Vertical GRF of the stance phase, GRF symmetry index (SI) and spatiotemporal gait measures were recorded. Patients were compared to age, gender and BMI healthy controls (CON).
Results: There were no differences in PROMs or gait function between groups pre-operatively. Post-operatively, cHRA had a higher MET score (11.2 vs 7.1, p = 0.02) and a higher MWS (6.2 vs 6.8 km/hr, p = 0.003) compared to THA. cHRA had a similar GRF profile to CON, whereas THA had a reduced push-off force at 70–77 % of the stance phase compared to CON. At faster walking speeds of 6 km/hr walking speed, THA displayed an asymmetric GRF profile (SI<4.4 %) whereas the cHRA patients continued to display a symmetrical gait profile. cHRAwas able to increase step length from pre-op levels (63 vs 66 cm, p = 0.02) and produced a larger step length compared to THA (73 vs 79 cm, p = 0.02).
Significance: Female cHRA returned to levels of gait function and activity similar to healthy controls unlike female THA. | | 1. Introduction Physical activity is an important part of health and wellbeing according to World Health Organisation (WHO) guidelines [1]. This can be confirmed using subjective metrics such as the metabolic equivalent of task (MET) [2], and objective gait metrics [3], both relating life expectancy to activity level on a population basis [3,4]. Hip disease, can be successfully treated by total hip arthroplasty (THA), relieving pain, and improving function. The improvement of walking ability and participating in physical activity has been shown to be an important outcome for patients following hip arthroplasty [5]. Many conventional patient reported outcome measures (PROMs) scores are based on a combination of reported pain, distance of walking, mobility, ability to perform activities of daily living, level of physical activity and limping. Despite well documented improvements in function compared to preoperative levels [6], deviations in gait and function often persist post THA surgery and patients with THA may be unable to restore the key elements of function displayed by healthy controls [6]. Metal-on-metal hip resurfacing arthroplasty (MoM-HRA) is a boneconserving alternative to THA, developed to restore hip mechanics by maintai

FAQs

What research question does the study address?

It examines whether female cHRA patients differ in gait function from female THA patients using both subjective PROMs and objective gait measures.

How were gait outcomes measured?

PROMs were collected (Oxford Hip Score, EQ5d, MET score), and patients underwent instrumented treadmill gait analysis pre- and post-operatively to record walking speed and ground reaction force metrics.

What were the main post-operative findings comparing cHRA and THA?

Post-operatively, cHRA had a higher MET score and different spatiotemporal and ground reaction force patterns than THA, with results closer to healthy controls.

Sep 21, 2026

Upload by Asher