2021 Annual Meeting Knee Access Pass-Plain Radiography versus MRI in the Measurement of Tibial Slope: Can they be Used Interchangeably?

Plain Radiography versus MRI in the Measurement of Tibial Slope: Can they be Used Interchangeably?

Video Transcription

Video Summary

This study examined the reliability of measuring posterior tibial slope (PTS) on radiographs versus MRI in young patients. PTS influences knee biomechanics and ACL forces, with slope-decreasing osteotomies offering potential benefits. The researchers found excellent interobserver reliability on both imaging types but noted a consistent 3-4 degree higher slope measurement on X-rays compared to MRI. Differences likely stem from knee positioning and tibial rotation during imaging. Limitations included lack of CT comparison and standardized knee flexion. The study concludes that while measurements are reproducible, X-ray and MRI slope values are not interchangeable, warranting caution in preoperative planning.

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Dr. Alexander Weber

Keywords

posterior tibial slope

radiograph vs MRI

knee biomechanics

interobserver reliability

preoperative planning