Background and Objective: Arthrosis of the hip joint is one of the most common complications of patients and many efforts have been made to find its etiology. One of the subjects important for researchers is morphologic parameters of the hip joint and its relationship with osteoarthritis of this joint. Since these parameters themselves are affected by physical parameters of the body and the race, we made an endeavor to study these parameters in an Iranian population. Materials and Methods: 300 normal anteroposterior radiograms of the pelvis were studied for anatomic parameters of the hip joint including: center edge angle of Wiberg, acetabular index, neck-shaft angle and head-neck ratio. Physical parameters of subjects including height, weight and body mass index (BMI) were recorded. The relationship between these parameters were studied using SPSS software. Results: Mean center-edge angle was 34 degrees, mean acetabular index was 38 degrees, mean head-neck ratio was 1.4 and mean neck-shaft angle was 130 degrees. Center-edge angle was greater than 25 degrees in 4.7% of our population. With respect to correlation between anatomic parameters of the hip and physical parameters, neck-shaft angle and height, and also head-neck ratio and BMI had positive correlations with neck-shaft angle and BMI, but head-neck ratio and height had inverse correlation. Conclusion: The mean parameters of hip joint in Iranian population are similar to other populations. In our population, 4.7% of asymptomatic hips had acetabular dysplasia. References 1- Doherty M, Courtney P, Doherty S, et al. Nonspherical femoral head shape (pistol grip deformity), neck shaft angle, and risk of hip osteoarthritis: a case–control study. Arthritis & Rheumatism. 2008 58: 3172-82. 2- Reijman M, Hazes J, Pols H, Koes B, Bierma‐Zeinstra S. Acetabular dysplasia predicts incident osteoarthritis of the hip: the Rotterdam study. Arthritis & Rheumatism. 2005 52: 787-93. 3- Daysal G, Goker B, Gonen E, et al. The relationship between hip joint space width, center edge angle and acetabular depth. Osteoarthritis and Cartilage. 2007 15: 1446-51. 4- Sharp IK. Acetabular dysplasia the acetabular angle. J Bone & Joint Surgery. 1961 43: 268-72. 5- Goker B, Sancak A, Arac M, Shott S, Block J. The radiographic joint space width in clinically normal hips: effects of age, gender and physical parameters. Osteoarthritis and Cartilage. 2003 11: 328-34. 6- Hoaglund FT, Oishi CS, Gialamas GG. Extreme variations in racial rates of total hip arthroplasty for primary coxarthrosis: a population-based study in San Francisco. Ann Rheum Dis. 1995 54: 107-10. 7- Inoue K, Wicart P, Kawasaki T, et al. Prevalence of hip osteoarthritis and acetabular dysplasia in French and Japanese adults. Rheumatology. 2000 39: 745-8. 8- Im G-I, Kim J-Y. Radiological joint space width in the clinically normal hips of a Korean population. Osteoarthritis and Cartilage. 2010 18: 61-4. 9- Yoshimura N, Campbell L, Hashimoto T, et al. Acetabular dysplasia and hip osteoarthritis in Britain and Japan. Rheumatology. 1998 37: 1193-7. 10- Lau E, Lin F, Lam D, Silman A, Croft P. Hip osteoarthritis and dysplasia in Chinese men. Ann Rheum Dis. 1995 54: 965-9. 11- Kellgren J, Lawrence J. Radiological assessment of osteo-arthrosis. Ann Rheum Dis. 1957 16: 494-502. 12- Congenital anomalies of the lower extremity. In: S. Terry Canale JHB, editor. Campbell’s Operative Orthopaedics. 2. 12th ed. Philadelphia: Mosby 2013. p. 980-1061. 13- Nötzli H, Wyss T, Stoecklin C, Schmid M, Treiber K, Hodler J. The contour of the femoral head-neck junction as a predictor for the risk of anterior impingement. J Bone & Surgery. 2002 84: 556-60. 14- Tian TP, Chen Y, Leow WK, Hsu W, Howe TS, Png MA. Computing neck-shaft angle of femur for x-ray fracture detection. Computer Analysis of Images and Patterns 2003: Springer. 15- Pajarinen J, Lindahl J, Savolainen V, Michelsson O, Hirvensalo E. Femoral shaft medialisation and neck-shaft angle in unstable pertrochanteric femoral fractures. Int Ortho. 2004 28: 347-53. 16- Ömeroglu H, Biçimoglu A, Aguş H, Tümer Y. Measurement of center-edge angle in developmental dysplasia of the hip: a comparison of two methods in patients under 20 years of age. Skeletal Radiology. 2002 31: 25-9. 17- Murphy SB, Ganz R, Müller M. The prognosis in untreated dysplasia of the hip. A study of radiographic factors that predict the outcome. J Bone & Joint Surgery. 1995 77: 985-9. 18- Fredensborg N. The CE angle of normal hips. Acta Orthopaedica. 1976 47: 403-5. 19- Laurenson RD. The Acetabular index a critical review. J Bone & Joint Surgery. 1959 41: 702-10. 20- Hoaglund F, Wenc djin L. Anatomy of the femoral neck and head, with comparative data from Caucasians and Hong Kong Chinese. Clin Ortho Res. 1980 152: 10-6. 21- Reikeras O, Hoiseth A. Femoral neck angles in osteoarthritis of the hip. Acta Orthopaedica. 1982 53: 781-4. 22- Anderson JY, Trinkaus E. Patterns of sexual, bilateral and interpopulational variation in human femoral neck-shaft angles. J Anatomy. 1998 192: 279-85. 23- Ganz R, Parvizi J, Beck M, Leunig M, Nötzli H, Siebenrock KA. Femoroacetabular impingement: a cause for osteoarthritis of the hip. Clin Ortho Res. 2003 417: 112-20.