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What factors affect posterior dislocation distance in THA?

Jim Nevelos1, Aaron Johnson, Christopher Heffernan

  • 1Stryker Orthopaedics, Mahwah, NJ, USA.

Clinical Orthopaedics and Related Research
|September 8, 2012
PubMed
Summary

Dual-mobility bearings offer the greatest resistance to dislocation after total hip arthroplasty (THA). This finding is crucial for optimizing component selection in high-risk patients and complex revision procedures.

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Implant design

Background:

  • Dislocation is a frequent complication following total hip arthroplasty (THA).
  • Identifying and mitigating risk factors for THA dislocation is critical.
  • Jump distance, a measure of dislocation potential, has been poorly understood in 3D kinematics.

Purpose of the Study:

  • To evaluate the 3D stability of four different component designs.
  • To determine the influence of abduction, anteversion, and pelvic inclination on THA stability.
  • To identify the optimal combination of factors for maximizing stability.

Main Methods:

  • A 3D model of a total hip arthroplasty (THA) was developed.
  • Acetabular components were simulated at various abduction and anteversion angles.

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  • Pelvic inclination angles simulating standing and chair-rising were utilized.

    • Main Results:

    • Posterior dislocation distance increased with pelvic inclination and femoral head size.
    • A 48-mm resurfacing component showed lower jump distances but risked posterior edge loading.
    • Dual-mobility bearings demonstrated the highest jump distance across all tested positions.

    Conclusions:

    • Monoblock cups necessitate precise positioning to minimize dislocation risk.
    • Pelvic orientation significantly impacts dislocation risk in THA.
    • Dual-mobility designs are recommended for patients at high risk of dislocation, including complex primary and revision THA cases.