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Do the cup surface properties influence the initial stability?

Vitali Goriainov1, Andrew Jones2, Adam Briscoe3

  • 1University Hospital Southampton NHS Foundation Trust.

The Journal of Arthroplasty
|November 26, 2013
PubMed
Summary
This summary is machine-generated.

Trabecular Metal (TM) and cemented acetabular cups show greater initial stability than Trilogy cups when implanted directly on host bone. TM cups offer satisfactory stability in bone graft constructs, though slightly less than cemented cups without significant bone contact.

Keywords:
acetabular defectsbone graftinginitial acetabular cup stabilityrevision hip arthroplastyrotational torsional testing

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Area of Science:

  • Orthopedic surgery
  • Biomaterials science
  • Implant stability research

Background:

  • Acetabular cup initial stability is crucial for successful total hip arthroplasty.
  • Uncemented acetabular cups aim for biologic fixation through bone ingrowth.
  • Surface characteristics of implants significantly influence osseointegration and stability.

Purpose of the Study:

  • To evaluate the relationship between acetabular cup surface characteristics and initial stability.
  • To compare the initial stability of uncemented (Trabecular Metal and Trilogy) and cemented polyethylene shells.
  • To investigate the influence of host bone contact and graft bed characteristics on implant stability.

Main Methods:

  • Comparative analysis of three acetabular cup types: Trabecular Metal (TM), Trilogy, and cemented polyethylene shells.
  • Assessment of initial stability under varying conditions: direct host bone fixation, 100% bone graft bed, and with incremental cavitary/segmental defects.
  • Statistical analysis (P-values) to determine significant differences in stability between cup types and conditions.

Main Results:

  • Trabecular Metal (TM) and cemented cups demonstrated significantly greater initial stability than Trilogy cups when mounted directly onto host bone (P < 0.01).
  • Minimal stability difference was observed between TM and cemented cups (P > 0.1) in direct bone contact, and also on a 100% graft bed (P > 0.1).
  • Cemented cups showed marginally greater stability than TM cups in the absence of significant host bone contact, and stability decreased with increasing graft defects for all cup types.

Conclusions:

  • Trabecular Metal (TM) cups exhibit satisfactory initial stability within bone graft constructs.
  • Acetabular cup surface characteristics influence initial stability, particularly in relation to host bone contact.
  • While TM cups are a viable option, cemented cups may offer marginally superior initial stability when host bone contact is limited.