Effect of pelvic tilt on changing the centre of rotation of the hip joint in preoperative planning

Abstract

The growing number of hip replacements associated with an ageing population requires more accurate and efficient methods of planning operations to ensure the success of interventions and minimise the risk of complications. The study aimed to demonstrate how changes in the pelvic angle affect the accurate determination of the centre of rotation of the hip joint. The study used dry pelvic and femoral bones with a 4 mm diameter implanted steel ball in the femoral head for modelling. X-rays were taken using a PLX 140 X-ray machine to record the displacement of the centre of rotation. The study confirmed the hypothesis that a change in the pelvic angle leads to a shift in the centre of rotation of the hip joint. This displacement requires attention during preoperative planning, as it can affect the choice and placement of the endoprosthesis. The study found that a high pelvic angle makes it difficult to fit a hip prosthesis, increasing the risk of prosthesis wear and dislocation. This requires an individualised approach to each patient, the use of special implants and postoperative monitoring. It is necessary to assess the anteversion and inclusion of the prosthesis, adjust the implantation depth and select the appropriate types of prosthesis based on the patient’s anatomy. The use of 3D modelling helps to optimise the placement of the prosthesis. Addressing anatomical features is key to reducing the risk of complications and improving the long-term results of arthroplasty