A guideline for placement of an infra-acetabular screw based on anatomic landmarks via an intra-pelvic approach

A guideline for placement of an infra-acetabular screw based on anatomic landmarks via an intra-pelvic approach

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Abstract Background Due to demographic changes, more and more fracture patterns involving anterior acetabular structures occur.The infra-acetabular here screw is seen a useful tool to increase stability in fixation of the acetabular cup.However, the exact position of this screw in relation to anatomic landmarks which are intra-operatively palpable via an intra-pelvic approach has not yet been determined.Methods This biomorphometric experimental study references the ideal screw position of an infra-acetabular screw to anatomic landmarks palpable via an intra-pelvic approach.Therefore, we created a computer tomography-based 3D-model of 40 patients (20 women, 20 men) who received a computer tomography (CT) scan of the pelvis for any other reason than an acetabular fracture.

Results The entry point of an ideal infra-acetabular was of high constancy.At mean, this point was 10.2 mm caudal and 10.4 merlot redbud tree for sale mm medial of the ilio-pubic/ilio-pectineal eminence.This reference is independent of age, gender, or physical dimensions.

However, we found gender-dependent differences for the angulation and the length of the screw.Conclusions This study provides a comprehensive guideline to determine the ideal entry point for an infra-acetabular screw via an intra-pelvic approach.The entry point is located 10.2 mm caudal and 10.4 mm medial of the ilio-pubic/ilio-pectineal eminence.

Trial registration Clinical Trial Registry University of Regensburg Z-2017-0930-1.Registered 04.Dec 2017.