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Differing prosthetic alignment and femoral component sizing between 2 computer-assisted CT-free navigation systems in
Tomoyuki Matsumoto1, Seiji Kubo, Hirotsugu Muratsu
1Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan. matsun@m4.dion.ne.jp
Orthopedics
|December 8, 2011
Summary
Comparing two computed tomography (CT)-free navigation systems for total knee replacement, the OrthoPilot system resulted in more accurate femoral component sizing and alignment than the VectorVision system. Differences in determining the knee center influenced component implantation.
Area of Science:
- Orthopedics
- Surgical Navigation Technology
Background:
- Image-free navigation systems in total knee arthroplasty (TKA) aim to improve accuracy.
- Previous use of a CT-free system resulted in oversized and extended femoral components.
Purpose of the Study:
- Compare femoral component alignment and sizing between two CT-free navigation systems (OrthoPilot and VectorVision).
- Investigate if knee center determination explains differences in component size and flexion.
Main Methods:
- Retrospective comparison of 30 total knee prostheses implanted with OrthoPilot versus 30 with VectorVision.
- Analysis of postoperative coronal and sagittal long leg radiographs.
Main Results:
- The VectorVision group showed significantly more extended sagittal femoral component alignment compared to the OrthoPilot group.
- Femoral components selected in the VectorVision group were significantly larger than in the OrthoPilot group.
- Differences in determined knee center likely explain the observed discrepancies.
Conclusions:
- The OrthoPilot CT-free navigation system provides more accurate femoral component implantation than the VectorVision system.
- Surgeons should consider the specific characteristics of each navigation system when making selections.
