{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,4]],"date-time":"2026-11-04T07:35:59Z","timestamp":1793777759560,"version":"4.6.1"},"reference-count":52,"publisher":"SAGE Publications","issue":"12","license":[{"start":{"date-parts":[[2019,9,5]],"date-time":"2019-09-05T00:00:00Z","timestamp":1567641600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"funder":[{"DOI":"10.13039\/501100001711","name":"schweizerischer nationalfonds zur f\u00f6rderung der wissenschaftlichen forschung","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100001711","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Am J Sports Med"],"published-print":{"date-parts":[[2019,10]]},"abstract":"<jats:sec>\n                    <jats:title>Background:<\/jats:title>\n                    <jats:p>Femoroacetabular impingement (FAI) is a complex 3-dimensional (3D) hip abnormality that can cause hip pain and osteoarthritis in young and active patients of childbearing age. Imaging is static and based on 2-dimensional radiographs or computed tomography (CT) scans. Recently, CT-based 3D impingement simulation was introduced for patient-specific assessments of hip deformities, whereas magnetic resonance imaging (MRI) offers a radiation-free alternative for surgical planning before hip arthroscopic surgery.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Purpose:<\/jats:title>\n                    <jats:p>To (1) investigate the difference between 3D models of the hip, (2) correlate the location of hip impingement and range of motion (ROM), and (3) correlate diagnostic parameters while comparing CT- and MRI-based osseous 3D models of the hip in symptomatic patients with FAI.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Study Design:<\/jats:title>\n                    <jats:p>Cohort study (Diagnosis); Level of evidence, 2.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>The authors performed an institutional review board\u2013approved comparative and retrospective study of 31 hips in 26 symptomatic patients with FAI. We compared CT- and MRI-based osseous 3D models of the hip in the same patients. 3D CT scans (slice thickness, 1 mm) of the entire pelvis and the distal femoral condyles were obtained. Preoperative MRI of the hip was performed including an axial-oblique T1 VIBE sequence (slice thickness, 1 mm) and 2 axial anisotropic (1.2 \u00d7 1.2 \u00d7 1 mm) T1 VIBE Dixon sequences of the entire pelvis and the distal femoral condyles. Threshold-based semiautomatic reconstruction of 3D models was performed using commercial software. CT- and MRI-based 3D models were compared with specifically developed software.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>(1) The difference between MRI- and CT-based 3D models was less than 1 mm for the proximal femur and the acetabulum (median surface distance, 0.4 \u00b1 0.1 mm and 0.4 \u00b1 0.2 mm, respectively). (2) The correlation for ROM values was excellent ( r = 0.99, P &lt; .001) between CT and MRI. The mean absolute difference for flexion and extension was 1.9\u00b0\u00b1 1.5\u00b0 and 2.6\u00b0\u00b1 1.9\u00b0, respectively. The location of impingement did not differ between CT- and MRI-based 3D ROM analysis in all 12 of 12 acetabular and 11 of 12 femoral clock-face positions. (3) The correlation for 6 diagnostic parameters was excellent ( r = 0.98, P &lt; .001) between CT and MRI. The mean absolute difference for inclination and anteversion was 2.0\u00b0\u00b1 1.8\u00b0 and 1.0\u00b0\u00b1 0.8\u00b0, respectively.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>Patient-specific and radiation-free MRI-based dynamic 3D simulation of hip impingement and ROM can replace CT-based 3D simulation for patients with FAI of childbearing age. On the basis of these excellent results, we intend to change our clinical practice, and we will use MRI-based 3D models for future clinical practice instead of CT-based 3D models. This allows radiation-free and patient-specific preoperative 3D impingement simulation for surgical planning and simulation of open hip preservation surgery and hip arthroscopic surgery.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/0363546519869681","type":"journal-article","created":{"date-parts":[[2019,9,5]],"date-time":"2019-09-05T11:36:41Z","timestamp":1567683401000},"page":"2966-2977","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":71,"title":["Patient-Specific 3-D Magnetic Resonance Imaging\u2013Based Dynamic Simulation of Hip Impingement and Range of Motion Can Replace 3-D Computed Tomography\u2013Based Simulation for Patients With Femoroacetabular Impingement: Implications for Planning Open Hip Preservation Surgery and Hip Arthroscopy"],"prefix":"10.1177","volume":"47","author":[{"given":"Till D.","family":"Lerch","sequence":"first","affiliation":[{"name":"Department of Orthopedic Surgery, Inselspital, University of Bern, Bern, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Celia","family":"Degonda","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, Inselspital, University of Bern, Bern, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Florian","family":"Schmaranzer","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, Inselspital, University of Bern, Bern, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Inga","family":"Todorski","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, Inselspital, University of Bern, Bern, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer","family":"Cullmann-Bastian","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, Inselspital, University of Bern, Bern, 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