C. Birkenmaier, G. Jorysz, V. Jansson, et al., “Normal Development of the Hip: A Geometrical Analysis Based on Planimetric Radiography,” Journal of Pediatric Orthopaedics, Vol. 19, No. 1, 2010, pp. 1-8.
 S. Tamura, T. Nishii, T. Shiomi, et al., “Three-Dimensional Patterns of Early Acetabular Cartilage Damage in Hip Dysplasia; A High-Resolutional CT Arthrography Study,” Osteoarthritis and Cartilage, Vol. 20, No. 7, 2012, pp. 642-652.
 P. Than, T. Sillinger, J. Kranicz, et al., “Radiographic Parameters of the Hip Joint from Birth to Adolescence,” Pediatric Radiology, Vol. 34, No. 3, 2004, pp. 237-244. doi:10.1007/s00247-003-1119-y
 Motoyuki Horii, Toshikazu Kubo, Shigehiro lnoue, et al., “Coverage of the Femoral Head by the Acetabular Labrum in Dysplastic Hips: Quantitative Analysis with Radial MR Imaging,” Acta Orthopaedica, Vol. 74, No. 3, 2003, pp. 287-292. doi:10.1080/00016470308540842
 K. Ueshimaa, K. A. Takahashia, M. Fujiokaa, et al., “Relationship between Acetabular Labrum Evaluation by Using Radial Magnetic Resonance Imaging and Progressive Joint Space Narrowing in Mild Hip Dysplasia,” Magnetic Resonance Imaging, Vol. 24, No. 5, 2006, pp. 645-650. doi:10.1016/j.mri.2005.12.009
 A. N. Larson, B. Tabenhorst, A. De La Rocha, et al., “Limited Intraobserver and Interobserver Reliability for the Common Measures of Hip Joint Congruency Used in Dysplasia,” Clinical Orthopaedics and Related Research, Vol. 470, No. 5, 2012, pp. 1414-1420. doi:10.1007/s11999-011-2136-z