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Noninvasive three‐dimensional assessment of femoroacetabular impingement
Author(s) -
Tannast Moritz,
KubiakLanger Monika,
Langlotz Frank,
Puls Marc,
Murphy Stephen B.,
Siebenrock Klaus A.
Publication year - 2007
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.20309
Subject(s) - femoroacetabular impingement , intraclass correlation , medicine , orthopedic surgery , hip arthroscopy , acetabulum , external rotation , range of motion , internal rotation , orthodontics , reproducibility , cadaver , arthroscopy , surgery , mathematics , mechanical engineering , clinical psychology , statistics , engineering , psychometrics
A CT‐based method (“HipMotion”) for the noninvasive three‐dimensional assessment of femoroacetabular impingement (FAI) was developed, validated, and applied in a clinical pilot study. The method allows for the anatomically based calculation of hip range of motion (ROM), the exact location of the impingement zone, and the simulation of quantified surgical maneuvers for FAI. The accuracy of HipMotion was 0.7 ± 3.1° in a plastic bone setup and −5.0 ± 5.6° in a cadaver setup. Reliability and reproducibility were excellent [intraclass correlation coefficient (ICC) > 0.87] for all measures except external rotation (ICC = 0.48). The normal ROM was determined from a cohort of 150 patients and was compared to 31 consecutive hips with FAI. Patients with FAI had a significantly decreased flexion, internal rotation, and abduction in comparison to normal hips ( p < 0.001). Normal hip flexion and internal rotation are generally overestimated in a number of orthopedic textbooks. HipMotion is a useful tool for further assessment of impinging hips and for appropriate planning of the necessary amount of surgical intervention, which represents the basis for future computer‐assisted treatment of FAI with less invasive surgical approaches, such as hip arthroscopy. © 2006 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 25:122–131, 2007