VIDEO: Knee position can influence patellar height in patella alta assessment
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LAS VEGAS — When assessing patella alta during the management of patellar instability, knee position can influence the measurement of patellar height at the time of radiographs, according to results.
Miho J. Tanaka, MD, and colleagues created 3D models of the knees of patients who had unilateral patellar instability. Researchers performed rotation of the knee and created 2Dimages in various positions to measure the patella alta for each position.
“Essentially, what we found was the measurements of alta varied with rotation and with abduction and adduction,” Tanaka, director of the Women’s Sports Medicine Program at Mass General Hospital and associate professor of orthopedic surgery at Harvard Medical School, told Healio about results presented at the American Academy of Orthopaedic Surgeons Annual Meeting. “Generally, if there was more than 4 mm of overlap of the distal condyles or the posterior condyles, the measurements were more likely to vary from the measurements performed in a perfect lateral condition. Surgeons should be aware of this when using those measurements to consider distalization of the tuberosity.”
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Bowman C, et al. Poster 405. Presented at: American Academy of Orthopaedic Surgeons Annual Meeting; March 7-11, 2023; Las Vegas.
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