Related Experiment Video
Updated: Apr 5, 2026
07:33
In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
Published on: May 5, 2023
1.2K
Do manual cutting guides for total knee arthroplasty introduce systematic error?
Erik Hohmann1,2, Kevin Tetsworth3,4
1Department of Orthopaedic Surgery, Clinical Medical School, University of Queensland, Brisbane, Australia. ehohmann@optusnet.com.au.
International Orthopaedics
|August 24, 2015
Summary
Conventional cutting jigs in total knee arthroplasty showed significant deviations in bone resection accuracy for both femur and tibia. Imageless navigation revealed inaccuracies in all planes, impacting component alignment and surgical outcomes.
Area of Science:
- Orthopedic Surgery
- Biomechanical Engineering
- Surgical Navigation
Background:
- Conventional bone cutting jigs in total knee arthroplasty (TKA) risk unintentional deviations, potentially leading to malaligned components.
- Accurate bone resection is crucial for optimal TKA component placement and long-term implant survival.
Purpose of the Study:
- To investigate the accuracy of femoral and tibial bone cutting jigs during primary total knee arthroplasty using imageless navigation.
- To quantify deviations between planned bone cuts and actual resections in TKA.
Main Methods:
- 125 patients undergoing primary TKA with a specific implant system used imageless navigation.
- Coronal and sagittal jig positions were recorded; bone resections were verified using a navigation tracker probe.
Main Results:
- Significant differences were found between planned and actual bone resections for all planes in both femur and tibia.
- Femoral sagittal cuts showed a tendency for over-resection (extended cut), while tibial cuts tended towards varus alignment.
- Deviations exceeding 2° occurred in 17% of femoral distal sagittal cuts and 9.6% of tibial proximal sagittal cuts.
Conclusions:
- Bone cutting jigs demonstrate significant inaccuracies in achieving planned bone resections in TKA, even with imageless navigation.
- The observed deviations in femoral and tibial cuts can compromise component alignment.
- Further refinement of cutting jig design or navigation integration is warranted to improve TKA accuracy.
