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BioMed Research International
Volume 2014 (2014), Article ID 562919, 10 pages
http://dx.doi.org/10.1155/2014/562919
Clinical Study

Accuracy of Patient Specific Cutting Blocks in Total Knee Arthroplasty

Abteilung für Orthopädie und Traumatologie des Bewegungsapparates, Bürgerspital Solothurn, Schöngrünstrasse 42, 4500 Solothurn, Switzerland

Received 1 March 2014; Revised 22 June 2014; Accepted 26 June 2014; Published 31 August 2014

Academic Editor: Padhraig O’Loughlin

Copyright © 2014 Naeder Helmy et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background. Long-term survival of total knee arthroplasty (TKA) is mainly determined by optimal positioning of the components and prosthesis alignment. Implant positioning can be optimized by computer assisted surgery (CAS). Patient specific cutting blocks (PSCB) seem to have the potential to improve component alignment compared to the conventional technique and to be comparable to CAS. Methods. 113 knees were selected for PSI and included in this study. Pre- and postoperative mechanical axis, represented by the hip-knee-angle (HKA), the proximal tibial angle (PTA), the distal femoral angle (DFA), and the tibial slope (TS) were measured and the deviation from expected ideal values was calculated. Results. With a margin of error of ±3°, success rates were 81.4% for HKA, 92.0% for TPA, and 94.7% for DFA. With the margin of error for alignments extended to ±4°, we obtained a success rate of 92.9% for the HKA, 98.2% for the PTA, and 99.1% for the DFA. The TS showed postoperative results of 2.86 ± 2.02° (mean change 1.76 ± 2.85°). Conclusion. PSCBs for TKA seem to restore the overall leg alignment. Our data suggest that each individual component can be implanted accurately and the results are comparable to the ones in CAS.