December 17, 2019
1 min read

MRI-, CT-based 3D models had similar diagnostic values for femoroacetabular impingement

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MRI-based 3D models of the hip joint had excellent correlation with and may replace CT-based 3D models for both diagnostic parameters and range of motion values in patients with femoroacetabular impingement, according to published results.

Till D. Lerch, MD, and colleagues compared CT- and MRI-based osseous 3D models of 31 hips in 26 patients with symptomatic femoroacetabular impingement. Researchers obtained 3D-CT scans of the entire pelvis and the distal femoral condyles and performed preoperative MRI of the hip.

Results showed a difference of less than 1 mm between MRI- and CT-based 3D models for the proximal femur and the acetabulum. Researchers found an excellent correlation for range of motion values and for six diagnostic parameters between CT and MRI. The 3D models had a mean absolute difference of approximately 1.9° for flexion, 2.6° for extension, 2° for inclination and 1° for anteversion, according to results. In CT- and MRI-based 3D range of motion analyses, researchers noted no differences in the location of impingement in 12 of 12 acetabular and in 11 of 12 femoral clock-face positions.

“3D MRI can replace 3D CT for dynamic impingement simulation for patients with [femoroacetabular impingement] FAI,” Lerch told “This could be used for 3D preoperative planning for patients undergoing hip arthroscopy.” – by Casey Tingle


Disclosures: Lerch reports no relevant financial disclosures. Please see the study for a list of all other authors’ relevant financial disclosures.