Journal of Orthopedic Research and Therapy (ISSN: 2575-8241)

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Comparison of Metal-on-Metal Versus Non-Metal-on-Metal Primary Total Hip Arthroplasty at 10 Years and Longer Follow-Up: A Prospective Cohort Study

Authors: Qingtian Li1,2, Haotao Li1,3, Yuanchen Ma3, Junxing Liao3, Mengyuan Li3, Yuhui Yang3, Guangtao Fu3, Qiujian Zheng1-3*

*Corresponding Author: Qiujian Zheng, Department of Orthopedics, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, PR China

1Department of Orthopedics, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, PR China

2School of Medicine, South China University of Technology, Guangzhou, PR China

3Shantou University Medical College, Shantou, China

Received Date: 05 April, 2022

Accepted Date: 11 April, 2022

Published Date: 14 April, 2022

Citation: : Li Q, Li H, Ma Y, Liao J, Li M, et al. (2022) Comparison of Metal-on-Metal Versus Non-Metal-on-Metal Primary Total Hip Arthroplasty at 10 Years and Longer Follow-Up: A Prospective Cohort Study. J Orthop Res Ther 7: 1225 DOI: https://doi.org/10.29011/2575-8241.001225

Abstract

Aims Metal-on-Metal (MoM) implants have been widely used since the early years of total hip arthroplasty (THA) development. Several clinical trials have shown promising outcomes compared with other implants. However, long-term clinical assessments are lacking. The aim of this prospective cohort study was to compare functional outcome scores and revision rates between MoM and non-MoM THA at the long-term follow-up.

Materials and Methods A cohort of 67 patients (67 hips) who underwent a primary THA with MoM and non-MoM from 2008 to 2010 was enrolled the study. At the patient’s clinic visit after at least 8 years of the surgery, we collected the required data to estimate the Harris Hip Score (HHS).

Results A total of 60 patients (MoM=22, non-MoM=38) were included in the final analysis. At the average follow-up time of 10.8 years, two of twenty-two MoM patients require revision surgery, while none of the non-MoM patients requires revision (P=0.071). The survival rates of MoM implants were similar to non-MoM implants (P=0.955). The mean HHS was significantly higher for non-MoM implants (91.66±9.08) compared to the MoM implants (81.64±20.05, P=0.036).

Conclusion HHS of MoM implants was lower than non-MoM implants at the long-term follow-up, neither of the Range of Motion (ROM) and absence of deformity. In addition, the revision rate in the MoM group was higher than the non-MoM group. Long-term follow-up is essential to evaluate the safety and functional outcome of the implants and optimize the care of patients with MoM implants.

Keywords: Metal-on-metal; Total hip arthroplasty; Periprosthetic joint infection

Abbreviations: Mom: Metal-on-Metal; THA: Total Hip Arthroplasty; ROM: Range of Motion; HHS: Harris Hip Score; Coc: Ceramics-on-Ceramics; Cop: Ceramics-on-Polyethylene; Mop: Metal-on-Polyethylene; MRI: Magnetic Resonance Imaging; OA: Osteoarthritis; FNF: Femoral Neck Fracture; ANFH: Avascular Necrosis of Femoral Head; DDH: Developmental Dysplasia of The Hip; PJI: Periprosthetic Joint Infection; LOS: Length of Stay

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