AN OSSEOUS STUDY OF MORPHOLOGICAL ASPECT OF ACETABULUM OF HIP BONE

BACKGROUND: The geometric discrepancies between the natural acetabulum and implant can result in painful iliopsoas impingement attributable to prosthetic overlap at the anterior acetabular ridge 1 . Largest hip failure occurs from prosthetic loosening may be because of weak interface originally 2 . Precise knowledge of acetabulum is required to understand mechanics of joint and planning for suitable prosthesis. The present study was taken to find the morphological variations of acetabulum. MATERIALS AND METHODS: All available 152 dry hip bone (74 belonged to right side and 78 to left side) of unknown age and sex were examined from the collection of the Anatomy department. Morphological variation of the shapes of anterior acetabular ridge was noted and transverse diameter and depth of acetabulum of hip bones were measured with the help of vernier callipers. RESULTS: Curved shaped anterior rim of acetabulum was found in 57 (37.5%) followed by straight shaped in 48(31.6%), irregular shaped in 28(18.4%) and angular shaped in 19(12.5%) specimens. Average maximum transverse diameter of acetabulum was measured 4.79 cm on right side and 4.83 cm on left side. Average depth of acetabulum was measured 2.71 cm on right side and 2.65 cm on left side. CONCLUSION: The present study will be helpful to orthopaedicians, radiologists and prosthetists for better understanding of pathophysiology of hip region and to design suitable size of prosthetics which are more functional to prevent common complications like dislocations and iliopsoas impingement.