Radiographic analysis of femoroacetabular impingement with Hip2norm—reliable and validated

The purpose of this study was to validate the accuracy, consistency, and reproducibility/reliability of a new method for correction of pelvic tilt and rotation of radiographic hip parameters for pincer type of femoroacetabular impingement on an anteroposterior pelvic radiograph. Thirty cadaver hips and 100 randomized, blinded AP pelvic radiographs were used for investigation. To detect the software accuracy, the calculated femoral head coverage and classic hip parameters determined with our software were compared to reference measurements based on CT scans or conventional radiographs in a neutral orientation as gold standard. To investigate software consistency, differences among the different parameters for each cadaver pelvis were calculated when reckoned back from a random to the neutral orientation. Intra‐ and interobserver comparisons were used to analyze the reliability and reproducibility of all parameters. All but two parameters showed a good‐to‐very good accuracy with the reference measurements. No relevant systematic errors were detected in the Bland–Altman analysis. Software consistency was good‐to‐very good for all parameters. A good‐to‐very good reliability and reproducibility was found for a substantial number of the evaluated radiographic acetabular parameters. The software appears to be an accurate, consistent, reliable, and reproducible method for analysis of acetabular pathomorphologies. © 2008 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 26:1199–1205, 2008

[1]  Guoyan Zheng,et al.  Hip2Norm: An object-oriented cross-platform program for 3D analysis of hip joint morphology using 2D pelvic radiographs , 2007, Comput. Methods Programs Biomed..

[2]  Branislav Jaramaz,et al.  Functional Pelvic Orientation Measured from Lateral Standing and Sitting Radiographs , 2006, Clinical orthopaedics and related research.

[3]  F. Langlotz,et al.  Estimation of pelvic tilt on anteroposterior X-rays—a comparison of six parameters , 2006, Skeletal Radiology.

[4]  M Tannast,et al.  Tilt and Rotation Correction of Acetabular Version on Pelvic Radiographs , 2005, Clinical orthopaedics and related research.

[5]  Jose A Morcuende,et al.  Radiographic Measurements in Developmental Dysplasia of the Hip: Reliability and Validity of a Digitizing Program , 2004, Journal of pediatric orthopedics.

[6]  Kjeld Søballe,et al.  Pelvic orientation and assessment of hip dysplasia in adults , 2004, Acta orthopaedica Scandinavica.

[7]  R. Ganz,et al.  Femoroacetabular impingement: a cause for osteoarthritis of the hip. , 2003, Clinical orthopaedics and related research.

[8]  K. Wood,et al.  Sagittal Profile of the Elderly , 2003, Journal of spinal disorders & techniques.

[9]  R. Ganz,et al.  Effect of Pelvic Tilt on Acetabular Retroversion: A Study of Pelves From Cadavers , 2003, Clinical orthopaedics and related research.

[10]  E. Itoi,et al.  Posterior pelvic tilt in patients with decreased lumbar lordosis decreases acetabular femoral head covering. , 2002, Orthopedics.

[11]  P. Zambelli,et al.  Simplified 3D-evaluation of periacetabular osteotomy. , 1999, Acta orthopaedica Belgica.

[12]  T. Mieno,et al.  Determination of acetabular coverage of the femoral head with use of a single anteroposterior radiograph. A new computerized technique. , 1993, The Journal of bone and joint surgery. American volume.

[13]  R. Ganz,et al.  CT evaluation of coverage and congruency of the hip prior to osteotomy. , 1988, Clinical orthopaedics and related research.

[14]  D. Altman,et al.  STATISTICAL METHODS FOR ASSESSING AGREEMENT BETWEEN TWO METHODS OF CLINICAL MEASUREMENT , 1986, The Lancet.

[15]  J. R. Landis,et al.  The measurement of observer agreement for categorical data. , 1977, Biometrics.

[16]  A. Beckett,et al.  AKUFO AND IBARAPA. , 1965, Lancet.

[17]  B. F. Morrey,et al.  Femoroacetabular Impingement: Radiographic Diagnosis—What the Radiologist Should Know , 2008 .

[18]  A. Cotten,et al.  Variations of pelvic anteversion in the lying and standing positions analysis of 24 control subjects and implications for CT measurement of position of a prosthetic cup , 2001, Surgical and Radiologic Anatomy.

[19]  小島 敦.  Simulation of acetabular coverage of femoral head using anteroposterior pelvic radiographs , 1998 .