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Functional navigation in hip resurfacing.

Georgina Waters1,2, Peter D'Alessandro1,2,3, Piers Yates1,2,3

  • 1Department of Orthopaedic Surgery, Fiona Stanley Fremantle Hospitals Group, Perth, Western Australia, Australia.

ANZ Journal of Surgery
|November 9, 2020
PubMed
Summary
This summary is machine-generated.

A new functional positioning protocol for hip resurfacing (HR) improves acetabular implant accuracy, reducing edge loading and enhancing patient outcomes. This patient-specific approach offers better precision than traditional methods.

Keywords:
arthroplastyfunctional navigationhip resurfacingorthopaedic surgery

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Implant positioning

Background:

  • Acetabular malpositioning in total hip arthroplasty (THA) can lead to complications like edge loading, increased wear, and bearing failure.
  • The historical Lewinnek's safe zone for THA cup positioning is increasingly recognized as not universally ideal.
  • Optimal acetabular positioning in hip resurfacing (HR) lacks sufficient data, though increased inclination is linked to edge loading.

Purpose of the Study:

  • To evaluate a functional positioning protocol for patient-specific (PS) acetabular implantation in HR.
  • To determine if PS functional ideal zones decrease edge loading and improve clinical outcomes compared to standard positioning.
  • To assess the relevance of Lewinnek's safe zone in the context of HR.

Main Methods:

  • A functional positioning protocol was used to generate PS dynamic analyses for ideal acetabular zones.
  • Fifteen hip resurfacing procedures were performed using the PS functional positioning protocol.
  • Intra-operative adjustments were made to standard THA acetabular positioning plans.

Main Results:

  • Dynamic post-operative analysis indicated 80% of implants were positioned appropriately.
  • Edge loading occurred in 20% of implants, with deviations in inclination and anteversion from planned positions.
  • No pre-operative planned positions met Lewinnek's safe zone criteria, suggesting its limited applicability in HR.
  • While 20% of patients experienced post-operative pain, all showed improved Oxford hip scores at 1 year.

Conclusions:

  • Functional positioning in HR enhances precision and accuracy in achieving ideal acetabular zones.
  • This patient-specific approach leads to improved clinical outcomes and effective prevention of edge loading.
  • The study highlights the limitations of generic safe zones like Lewinnek's for HR procedures.