BILATERAL HIP RESURFACING ARTHROPLASTY RESTORES GAIT FUNCTION AT INCREASING WALKING SPEEDS

Amy Maslivec; K. C. Geoffrey Ng; Justin Cobb

doi:10.1302/1358-992X.2021.16.054

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BILATERAL HIP RESURFACING ARTHROPLASTY RESTORES GAIT FUNCTION AT INCREASING WALKING SPEEDS

The British Orthopaedic Research Society (BORS) Annual Meeting 2021, held online, 13–14 September 2021.

Amy Maslivec
K. C. Geoffrey Ng
Justin Cobb

BILATERAL HIP RESURFACING ARTHROPLASTY RESTORES GAIT FUNCTION AT INCREASING WALKING SPEEDS

Maslivec A, Ng KCG, Cobb J. BILATERAL HIP RESURFACING ARTHROPLASTY RESTORES GAIT FUNCTION AT INCREASING WALKING SPEEDS. Orthop Procs. 2021;103-B(SUPP_16):54-54. doi:10.1302/1358-992X.2021.16.054

Maslivec, Amy, et al. “BILATERAL HIP RESURFACING ARTHROPLASTY RESTORES GAIT FUNCTION AT INCREASING WALKING SPEEDS.” Orthopaedic Proceedings, vol. 103-B, no. SUPP_16, 2021, pp. 54-54., https://doi.org/10.1302/1358-992X.2021.16.054

Maslivec, A., Ng, K. C. G., & Cobb, J. (2021). BILATERAL HIP RESURFACING ARTHROPLASTY RESTORES GAIT FUNCTION AT INCREASING WALKING SPEEDS. Orthopaedic Proceedings, 103-B(SUPP_16), 54-54. https://doi.org/10.1302/1358-992X.2021.16.054

Maslivec, A., Ng, K. C. G. and Cobb, J. (2021) “BILATERAL HIP RESURFACING ARTHROPLASTY RESTORES GAIT FUNCTION AT INCREASING WALKING SPEEDS.” Orthopaedic Proceedings, 103-B(SUPP_16), pp. 54-54. Available at: https://doi.org/10.1302/1358-992X.2021.16.054

Maslivec, Amy, K. C. Geoffrey Ng, and Justin Cobb. “BILATERAL HIP RESURFACING ARTHROPLASTY RESTORES GAIT FUNCTION AT INCREASING WALKING SPEEDS.” Orthopaedic Proceedings 103-B, no. SUPP_16 (2021): 54-54. https://doi.org/10.1302/1358-992X.2021.16.054

Maslivec A, Ng KCG, Cobb J. BILATERAL HIP RESURFACING ARTHROPLASTY RESTORES GAIT FUNCTION AT INCREASING WALKING SPEEDS. Orthop Procs. 2021 Dec 1;103-B(SUPP_16):54-54. https://doi.org/10.1302/1358-992X.2021.16.054

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Abstract

Objectives

Although hip replacement and resurfacing procedures both aim to restore mobility, improve joint function, and relieve pain, it is unclear how each differ in terms of gait mechanics and if they are affected by varying walking speeds. We compared limb symmetry and ground reaction force (GRF) profiles between bilateral total hip arthroplasty patients (THA), bilateral hip resurfacing arthroplasty patients (HRA), and healthy control participants (CON) during level-treadmill walking at different speeds.

Methods

Bilateral THA and bilateral HRA patients (nTHA = 15; nHRA = 15; postoperative 12–18 months), and age-, mass-, and height-matched CON participants (nCON = 20) underwent gait analysis on an instrumented treadmill. Walking trials started at 4 km/h and increased in 0.5 km/h increments until top walking speed (TWS) was achieved. Gait symmetry index (SI = 0% for symmetry) was assessed between limbs during weight-acceptance, mid-stance and push-off phases of gait; and vertical GRFs were captured for the normalised stance phase using statistical parametric mapping (SPM; CI = 95%).

Results

THA had a significantly lower TWS (6.51 ± 0.06 km/h) compared to HRA (7.09 ± 0.07 km/h, p = 0.01) and CON (7.15 km/h ± 0.06, p = 0.02). There were no SI differences between groups nor between walking speeds (SI < 5%). There were no GRF differences between groups at slower walking speeds (4.0–5.0 km/h). However, at 5.5 and 6 km/h, THA had lower GRF at the push-off phase (0.88 ± 0.09 N/BW), compared to HRA (1.06 ± 0.08 N/BW, p = 0.01) and CON (1.04 ± 0.02 N/BW, p = 0.01).

Conclusions

The main finding was that HRA patients demonstrated restored gait function and similar walking profiles to CON participants at any speed. With a diverging gait profile, walking speeds over 5.5 km/h provided a functional challenge for THA patients.