VIDEO: Greater than 4 cm of cortical length needed for accurate femoral tunnel position
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LAS VEGAS — Results showed femoral tunnel position may not be accurate if less than 4 cm of posterior cortical length is visible when performing radiographs during medial patellofemoral complex reconstruction.
Miho J. Tanaka, MD, and colleagues identified the midpoint of the femoral tunnel or the femoral attachment of the medial patellofemoral complex (MPFC) in cadaveric knees and collected lateral radiographs, extending each radiograph by 1 cm.
“In the largest view, we had 8 cm of the posterior cortex visible. And in the smallest view, we had only 1 cm visible,” Tanaka, director of the Women’s Sports Medicine Program at Mass General Hospital and associate professor of orthopedic surgery at Harvard Medical School, said about a study presented at the American Orthopaedic Society for Sports Medicine Specialty Day during the American Academy of Orthopaedic Surgeons Annual Meeting.
Because the slope of the posterior cortex extends posteriorly the closer the surgeon is to the knee, Tanaka said measurements of the femoral tunnel position tended to be inaccurate if less than 4 cm of the posterior cortex was visible.
“Surgeons who use radiographs intraoperatively during MPFC reconstruction should be aware that if you have less than 4 cm of visible posterior cortical length that the measurements identifying the femoral tunnel position may not be accurate. And so, you may need to get a bigger field of view for this,” Tanaka said.
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Bhimani R, et al. Paper 6. Presented at: American Academy of Orthopaedic Surgeons Annual Meeting; March 7-11, 2023; Las Vegas.
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