EARLY RESULTS OF THE CORIN OPTIMIZED POSITIONING SYSTEM: A REGISTRY ANALYSIS OF 841 CONSECUTIVE TOTAL HIP ARTHROPLASTIES

A. Shimmin; J. Pierrepont; J. Bare; S. McMahon

doi:10.1302/1358-992X.2020.1.083

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General Orthopaedics

EARLY RESULTS OF THE CORIN OPTIMIZED POSITIONING SYSTEM: A REGISTRY ANALYSIS OF 841 CONSECUTIVE TOTAL HIP ARTHROPLASTIES

International Society for Technology in Arthroplasty (ISTA) meeting, 32nd Annual Congress, Toronto, Canada, October 2019. Part 1 of 2.

A. Shimmin
J. Pierrepont
J. Bare
S. McMahon

EARLY RESULTS OF THE CORIN OPTIMIZED POSITIONING SYSTEM: A REGISTRY ANALYSIS OF 841 CONSECUTIVE TOTAL HIP ARTHROPLASTIES

Shimmin A, Pierrepont J, Bare J, McMahon S. EARLY RESULTS OF THE CORIN OPTIMIZED POSITIONING SYSTEM: A REGISTRY ANALYSIS OF 841 CONSECUTIVE TOTAL HIP ARTHROPLASTIES. Orthop Procs. 2020;102-B(SUPP_1):83-83. doi:10.1302/1358-992X.2020.1.083

Shimmin, A., et al. “EARLY RESULTS OF THE CORIN OPTIMIZED POSITIONING SYSTEM: A REGISTRY ANALYSIS OF 841 CONSECUTIVE TOTAL HIP ARTHROPLASTIES.” Orthopaedic Proceedings, vol. 102-B, no. SUPP_1, 2020, pp. 83-83., https://doi.org/10.1302/1358-992X.2020.1.083

Shimmin, A., Pierrepont, J., Bare, J., & McMahon, S. (2020). EARLY RESULTS OF THE CORIN OPTIMIZED POSITIONING SYSTEM: A REGISTRY ANALYSIS OF 841 CONSECUTIVE TOTAL HIP ARTHROPLASTIES. Orthopaedic Proceedings, 102-B(SUPP_1), 83-83. https://doi.org/10.1302/1358-992X.2020.1.083

Shimmin, A., Pierrepont, J., Bare, J. and McMahon, S. (2020) “EARLY RESULTS OF THE CORIN OPTIMIZED POSITIONING SYSTEM: A REGISTRY ANALYSIS OF 841 CONSECUTIVE TOTAL HIP ARTHROPLASTIES.” Orthopaedic Proceedings, 102-B(SUPP_1), pp. 83-83. Available at: https://doi.org/10.1302/1358-992X.2020.1.083

Shimmin, A., J. Pierrepont, J. Bare, and S. McMahon. “EARLY RESULTS OF THE CORIN OPTIMIZED POSITIONING SYSTEM: A REGISTRY ANALYSIS OF 841 CONSECUTIVE TOTAL HIP ARTHROPLASTIES.” Orthopaedic Proceedings 102-B, no. SUPP_1 (2020): 83-83. https://doi.org/10.1302/1358-992X.2020.1.083

Shimmin A, Pierrepont J, Bare J, McMahon S. EARLY RESULTS OF THE CORIN OPTIMIZED POSITIONING SYSTEM: A REGISTRY ANALYSIS OF 841 CONSECUTIVE TOTAL HIP ARTHROPLASTIES. Orthop Procs. 2020 Feb 1;102-B(SUPP_1):83-83. https://doi.org/10.1302/1358-992X.2020.1.083

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Abstract

Introduction & aims

Apparently well-orientated total hip replacements (THR) can still fail due to functional component malalignment. Previously defined “safe zones” are not appropriate for all patients as they do not consider an individual's spinopelvic mobility. The Optimized Positioning System, OPS^TM (Corin, UK), comprises preoperative planning based on a patient-specific dynamic analysis, and patient-specific instrumentation for delivery of the target component alignment. The aim of this study was to determine the early revision rate from the Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR) for THRs implanted using OPS^TM.

Method

Between January 4^th 2016 and December 20^st 2017, a consecutive series of 841 OPS^TMcementless total hip replacements were implanted using a Trinity acetabular cup (Corin, UK) with either a TriFit TS stem (98%) or a non-collared MetaFix stem (2%). 502 (59%) procedures were performed through a posterior approach, and 355 (41%) using the direct superior approach. Mean age was 64 (range; 27 to 92) and 51% were female. At a mean follow-up of 15 months (range; 3 to 27), the complete list of 857 patients was sent to the AOANJRR for analysis.

Results

There were 5 revisions:

a periprosthetic femoral fracture at 1-month post-op in a 70F
a ceramic head fracture at 12-months post-op in a 59M
a femoral stem loosening at 7-months post-op in a 58M
a femoral stem loosening at 16-months post-op in a 64M
an anterior dislocation in a 53M, that was revised 9 days after the primary procedure. CT analysis, prior to revision surgery, revealed acetabular cup orientation of 46°/31° (inclination/anteversion) and femoral stem anteversion of 38°.

Conclusions

These preliminary findings suggest the OPS^TM dynamic planning and delivery system provides good early results, with a low rate of revision for dislocation. Limitations of the study will be discussed.