Table of Contents
ISRN Orthopedics
Volume 2012 (2012), Article ID 509750, 4 pages
http://dx.doi.org/10.5402/2012/509750
Research Article

Assessing the Accuracy of Bone Resection by Cutting Blocks in Patient-Specific Total Knee Replacements

1Division of Orthopaedics and Trauma, The Queen Elizabeth Hospital, Adelaide, SA 5011, Australia
2Department of Orthopaedic and Trauma Surgery, Toowoomba Hospital, Toowoomba, QlD, Australia
3Department of Orthopaedic and Trauma Surgery, TORT Centre, Ninewells Hospital and Medical School, University of Dundee, Dundee DD19SY, UK
4The Queen Elizabeth Hospital, Adelaide, SA 5011, Australia
5Department of Orthopaedic and Trauma Surgery, Ninewells Hospital, Ward 18-19, Level 5, Dundee, UK
6The University of Adelaide, Adelaide, SA 5005, Australia

Received 23 February 2012; Accepted 19 March 2012

Academic Editors: M. Hasegawa and T. Matsumoto

Copyright © 2012 Cheng Hong Yeo 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

Introduction. The key to a successful total knee arthroplasty (TKA) is the restoration of the mechanical axis with balanced flexion and extension gaps. Patient-specific cutting block technique has been the latest development in total knee arthroplasty. This technique uses a magnetic resonance image (MRI) of the patient's symptomatic knee to create bone models and cutting jigs. This study was designed to evaluate the intraoperative accuracy of the patient-specific cutting block as compared to the preoperative template. Methods. Visionaire (Smith and Nephew, Genesis 2 Knee Arthroplasty) patient-specific TKA was used in all patients. An independent research officer was responsible for measuring all the resected articular surfaces of femur and tibia during surgery and compared it to the cutting block manufactured according to the preoperative template. Seven different measurements from each patient were obtained; four different measurements from the femur and three from the tibia were recorded. The differences between the actual resections made intraoperatively, as compared to the original pre-operative templates, were noted as the error. The surgical team was blinded to the measurements of the resections and the calculations of the errors. Results. Twenty-six Visionaire patient-specific TKA were included in the study. A total of 182 readings of bone resections made intraoperatively (seven for each patient). Eighty five percent of all collected readings were below the error margin of ≤1.5 mm. Size of resection had no effect on the error margin. All patients had satisfactory post-operative alignment, and at discharge all 26 patients achieved more than 90° of knee flexion. Conclusion. This observational study provides evidence that patient-specific TKA is comparable to other forms of TKA and may have some distinct advantages. In addition, we have shown that the cutting blocks are able to consistently deliver accurate cuts that are reproducible. We recommend intra-operative measurement of the bone resection and its comparison with the cutting block as a routine surgical step to confirm the MRI scan data, block placement, and instant validation of the bony resection before implant placement.