Dual-mobility versus Fixed-bearing in Primary Total Hip Arthroplasty: Outcome Comparison
- Author:
Vivek SINGH
1
;
Jeremy LOLOI
;
William MACAULAY
;
Matthew S. HEPINSTALL
;
Ran SCHWARZKOPF
;
Vinay K. AGGARWAL
Author Information
- Publication Type:ORIGINAL ARTICLE
- From:Hip & Pelvis 2022;34(2):96-105
- CountryRepublic of Korea
- Language:English
-
Abstract:
Purpose:Use of dual mobility (DM) articulations can reduce the risk of instability in both primary and revision total hip arthroplasty (THA). Knowledge regarding the impact of this design on patient-reported outcome measures (PROMs) is limited. This study aims to compare clinical outcomes between DM and fixed bearing (FB) prostheses following primary THA.
Materials and Methods:All patients who underwent primary THA between 2011-2021 were reviewed retrospectively. Patients were separated into three cohorts: FB vs monoblock-D vs modular-DM. An evaluation of PROMs including HOOS, JR, and FJS-12, as well as discharge-disposition, 90-day readmissions, and revisions rates was performed. Propensity-score matching was performed to limit significant demographic differences, while ANOVA and chi-squared test were used for comparison of outcomes.
Results:Of the 15,184 patients identified, 14,652 patients (96.5%) had a FB, 185 patients (1.2%) had a monoblock-DM, and 347 patients (2.3%) had a modular-DM prosthesis. After propensity-score matching, a total of 447 patients were matched comparison. There was no statistical difference in the 90-day readmission (P=0.584), revision rate (P=0.265), and 90-day readmission (P=0.365) and revision rate due to dislocation (P=0.365) between the cohorts. Discharge disposition was also non-significant (P=0.124). There was no statistical difference in FJS-12 scores at 3-months (P=0.820), 1-year (P=0.982), and 2-years (P=0.608) between the groups.
Conclusion:DM bearings yield PROMs similar to those of FB implants in patients undergoing primary THA.Although DM implants are utilized more often in patients at higher-risk for instability, we suggest that similar patient satisfaction may be attained while achieving similar dislocation rates.
