Good Short-Term Survivorship of Constrained Condylar Revision Knee Implants With Medial Pivot Kinematics: A Level IV Retrospective Study

Arieh Greenberg; Daniel Cohen; Ali Shahabinezhad; Bardia Barimani; Jesse Wolfstadt; David Backstein

doi:10.1016/j.arth.2024.02.041

Good Short-Term Survivorship of Constrained Condylar Revision Knee Implants With Medial Pivot Kinematics: A Level IV Retrospective Study

J Arthroplasty. 2024 Feb 22:S0883-5403(24)00140-2. doi: 10.1016/j.arth.2024.02.041. Online ahead of print.

Authors

Arieh Greenberg¹, Daniel Cohen¹, Ali Shahabinezhad², Bardia Barimani³, Jesse Wolfstadt¹, David Backstein¹

Affiliations

¹ Granovsky Gluskin Orthopedic Division, Sinai Health System, University of Toronto, Toronto, ON, Canada.
² The Ottawa Hospital, University of Ottawa, Ottawa, Canada.
³ Department of Orthopaedics, Arthroscopy & Joint Reconstruction, University of Texas Medical Branch at Galveston, Galveston, Texas.

PMID: 38395111
DOI: 10.1016/j.arth.2024.02.041

Abstract

Background: The need for revision total knee arthroplasty surgery is increasing worldwide, and, in many cases, a constrained implant is required to provide joint stability. The purpose of this study was to examine the early loosening and functional outcome of a novel constrained condylar (CCK) revision total knee system designed to have medial pivot (MP) kinematics.

Methods: A retrospective cohort study was performed, collecting clinical data from all patients who underwent revision total knee arthroplasty using a novel MP CCK system with a minimum four-year clinical follow-up. Patient demographics, survivorship, complications, and Forgotten Joint Score were analyzed based upon chart review.

Results: There were 49 patients available for follow-up, who had a 100% survivorship free of aseptic loosening. All-cause revision survivorship was 92%. There were 4 patients who subsequently underwent rerevision. The causes for rerevision included periprosthetic joint infection in 2 patients, coronal plane instability in one patient, and a traumatic knee dislocation in one patient. There were 45 patients who completed the Forgotten Joint Score, who had an average of 49.8 (± 32.8, range 6.25 to 100).

Conclusions: At 4 years, mid-term follow-up, this novel CCK revision total knee system designed to have MP kinematics had good patient-reported outcomes with no revision for aseptic loosening. Future studies should evaluate the mid- and long-term survivorship of this innovative implant.

Keywords: CCK; arthroplasty; biomechanics; revision; total knee.