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- Title
Three different cruciate-sacrificing TKA designs: minor intraoperative kinematic differences and negligible clinical differences.
- Authors
Zaffagnini, Stefano; Akkawi, Ibrahim; Marko, Tedi; Bruni, Danilo; Neri, Maria; Colle, Francesca; Marcacci, Maurilio; Bignozzi, Simone
- Abstract
Purpose: The goal of this study was to compare three types of mobile-bearing posterior cruciate ligament (PCL)-sacrificing TKA. The hypothesis was that the three designs provide differences in flexion stability and femoral rollback and improved clinical score at 2-year follow-up. Methods: Three groups of patients, divided according to implant design, were analysed retrospectively. All operations were guided by a non-image-based navigation system that recorded relative femoral and tibial positions in native and implanted knees during: passive range of motion and anterior drawer test at 90° flexion. WOMAC, KSS and SF36 scores were collected pre-operatively and at 2-year follow-up. Results: There are no differences in kinematic or clinical performance of the three implants, except for the antero-posterior translation during stress test in flexion: only Cohort B had comparable pre- and post-operative laxity test values ( p < 0.001). All three TKA designs allowed to maintain pre-operative tibial rotation pattern through all range of knee flexion. All clinical scores of the three patient cohorts were significantly improved post-operatively compared to the pre-operative values ( p < 0.001). Moreover, we found no differences among post-operative results of the three designs. Conclusion: Despite design variations, mobile-bearing PCL-sacrificing TKA reproduces femoral rollback and screw-home with little or no difference in clinical or functional scores at a follow-up of 2 years. Level of evidence: III.
- Subjects
TOTAL knee replacement; KINEMATICS; POSTERIOR cruciate ligament; FEMUR; RANGE of motion of joints
- Publication
Knee Surgery, Sports Traumatology, Arthroscopy, 2014, Vol 22, Issue 12, p3113
- ISSN
0942-2056
- Publication type
Article
- DOI
10.1007/s00167-014-3200-5