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The position of the Sciatic nerve is variable, and this study aims to look for the correlation between femoral head size and the distance to the sciatic nerve in order to be able to judge position during the posterior approach to the hip. Methods: 60 Magnetic Resonance Imaging Scans of Hips were identified to examine for position of the sciatic nerve in relation to insertion of obturator externus and the postero-medial corner of the lesser trochanter. The relationship with the femoral head size was also examined Results: The results show that with increasing size of femoral head, the distance to the sciatic increases. The average distances to the Sciatic Nerve from the lesser trochanter was 14.9mm when head size was greater than 45mm and was 13.1mm when head size was below 45mm. Conclusions: There is a proportional increase in distance of sciatic nerve from the hip joint with increase in femoral head size. This study provides evidence on relationship of the nerve to the hip joint which further strengthens our understanding of anatomy and we hope will help to give surgeons a good idea of the proximity of the nerve to their operative field.

Proximity of the Sciatic Nerve in Relation to the Posterior Approach to the Hip, and its Relationship to Femoral Head Size