Abstract
BackgroundKnowledge of periacetabular anatomy is crucial for prosthetic cup placement in total hip arthroplasty and for screw placement in anterior fixation with acetabular fractures. It is known that degree of hip dysplasia correlates with medial bone stock and that medial bone stock shows a weak correlation to Lequesne’s acetabular index (AI). Aim of this study was to investigate a possible correlation between AI and the newly proposed medial safe zone.MethodsAI and the medial save zone were measured on 419 hips using a computed-tomography scan of the pelvis. AI was assessed on a 2D reconstructed anterior-posterior view of the pelvis using VOXAR™. Correlation was measured using the Pearson correlation coefficient.ResultsMean AI was 4.2 degrees (SD 4.9 degrees). Mean medial safe zone was 8.1 mm (SD 1.9 mm). There was a significant correlation between AI and medial save space with a Pearson correlation coefficient r = 0.33 (p = .001).ConclusionThere is a weak correlation between AI and medial safe zone. AI should not be used to predict medial safe zone. Due to the weakness in correlation AI is not suited for predicting medial safe zone. However, a low or negative AI can be a warning sign for less medial safe zone, prompting surgeons to take care when reaming in THA or placing periacetabular screws.
Highlights
Knowledge of periacetabular anatomy is crucial for prosthetic cup placement in total hip arthroplasty and for screw placement in anterior fixation with acetabular fractures
Precise anatomical knowledge of the periacetabular region is required both for total hip arthroplasty (THA) and surgical fixation of acetabular fractures
Precise knowledge of the periacetabular anatomy is crucial for reaming in THA and during open reduction and internal fixation of acetabular fractures using anterior surgical approaches
Summary
Knowledge of periacetabular anatomy is crucial for prosthetic cup placement in total hip arthroplasty and for screw placement in anterior fixation with acetabular fractures. Precise anatomical knowledge of the periacetabular region is required both for total hip arthroplasty (THA) and surgical fixation of acetabular fractures. One of the parameters surgeons are interested in, is the medial bone stock or the thickness of the quadrilateral plate. With THA this information is required for the process of reaming. Both under- and overreaming have been made responsible for acetabular component protrusion into the pelvis [1, 2]. Medial bone stock is of interest in the case of open reduction and internal
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