Abstract
Purpose
Several authors have observed that standard instrumentation (SI) may be insufficient for addressing component malalignment. Patient-matched cutting blocks (PMCB) technology was introduced to improve surgeons’ ability to achieve a neutral postoperative mechanical axis following total knee arthroplasty (TKA). The current retrospective study was designed to compare the ability of SI and PMCB to achieve a hip-knee-ankle angle (HKA) within ±3° of the ideal alignment of 180°.
Methods
Between October 2009 and December 2012, 170 TKAs in 166 patients (four bilateral) using VISIONAIRE (Smith & Nephew) PMCB technology were performed. Additionally, 160 TKAs in 160 consecutive patients that had received a total knee arthroplasty using SI during the same time period were used as a control group, All surgeries were performed by the same surgeon. Standardized pre- and postoperative long-leg standing x-rays were retrospectively evaluated to compare the two patient cohorts.
Results
X-rays were available for analysis for 156 knees in the SI group and 150 in the PMCB group. The average post-surgical HKA was 178.7 ± 2.5 in the SI group and 178.4 ± 1.5 in the PMCB group. However, the rate of ± 3° outliers was 21.2 % in the SI group and 9.3 % in the PMCB group. There were no intraoperative complications with the use of PMCB technology or SI.
Conclusions
PMCB technology proved superior to conventional instrumentation in achieving a neutral mechanical axis following TKA. Further follow-up will be needed to ascertain the long-term impact of these findings.
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Acknowledgements
The authors wish to thank the medical assistants Ms. Christina Andrusiak, Ms. Sandra Schaefer, and Ms. Evi Schwarz for the collection of radiographic and patient data and Mr Robert Gartner for his assistance in the measurements. Smith & Nephew provided a medical writer (John Watson) who proofread and edited the manuscript for grammar and issues related to English language.
Conflict of interest
No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article. C.O.T is a paid teaching consultant to Smith & Nephew. The authors declare that there are no other potential conflicts of interest in connection with this paper.
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Daniilidis, K., Tibesku, C.O. A comparison of conventional and patient-specific instruments in total knee arthroplasty. International Orthopaedics (SICOT) 38, 503–508 (2014). https://doi.org/10.1007/s00264-013-2028-9
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DOI: https://doi.org/10.1007/s00264-013-2028-9