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Computer navigation experience in hip resurfacing improves femoral component alignment using a conventional jig.
Zachary Morison1, Akshay Mehra1, Michael Olsen1
1Department of Orthopaedic Surgery, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada.
Indian Journal of Orthopaedics
|January 1, 2014
Summary
Surgeons experienced with computer navigation for hip resurfacing achieved greater accuracy in femoral component placement using conventional jigs. This suggests prior navigation use can enhance traditional technique outcomes.
Area of Science:
- Orthopedic surgery
- Surgical navigation technologies
Background:
- Computer navigation improves femoral component accuracy in hip resurfacing.
- The impact of prior navigation experience on subsequent conventional technique accuracy is unknown.
Purpose of the Study:
- To investigate if experience with imageless computer navigation enhances femoral component alignment accuracy when using conventional jigs in hip resurfacing.
Main Methods:
- 213 hip resurfacings by one surgeon (Dec 2004-Dec 2008).
- Cohort 1 (n=17) and Cohort 2 (n=9) used conventional jigs.
- 187 cases utilized imageless computer navigation.
Main Results:
- Cohort 2 (post-navigation experience) showed a mean stem-shaft angle deviation of 2.2°, significantly better than Cohort 1's 5.6° (P=0.01).
- All Cohort 2 components met planned positions; Cohort 1 had 8 malpositioned implants (varus/retroversion).
Conclusions:
- Conventional instrumentation for femoral component placement may improve after surgeons gain experience with imageless computer navigation.
- Prior navigation exposure can refine skills applicable to traditional hip resurfacing techniques.
