Contemporary Dual Mobility Head Penetration at Five Years

Concern for the Additional Convex Bearing Surface?

Evan R. Deckard, Khalid A. Azzam, R. Meneghini

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Background: Dual mobility (DM) bearings are increasingly popular and second-generation designs contain highly cross-linked polyethylene. The purpose of this study is to report head penetration rates in modern DM bearings. Methods: A review of 63 consecutive DM bearings was performed. Radiographs were analyzed for head penetration using Martell methodology at regular postoperative intervals. Results: Thirty-four DM bearings were analyzed. Mean linear head penetration was 1.59 mm/y at 1 year, 1.07 mm/y at 2 years, and 0.27 mm/y at 5 years following an exponential regression model (R2 = 0.999). Mean volumetric wear was 783 mm3/y at 1 year, 555 mm3/y at 2 years, and 104 mm3/y at 5 years following an exponential regression model (R2 = 0.986). Conclusion: Initial head penetration of DM bearings is larger than contemporary cross-linked polyethylene bearings; however, rates approach steady state after 2 years, analogous to traditional bearings. The larger “bedding-in” head penetration may be due to the additional convex bearing surface, creating 2 surfaces for deformation/wear.

Original languageEnglish (US)
JournalJournal of Arthroplasty
DOIs
StateAccepted/In press - Jan 1 2018

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Head
Polyethylene

Keywords

  • bearing wear
  • dual mobility
  • femoral head penetration
  • highly cross-linked polyethylene
  • total hip arthroplasty

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Cite this

Contemporary Dual Mobility Head Penetration at Five Years : Concern for the Additional Convex Bearing Surface? / Deckard, Evan R.; Azzam, Khalid A.; Meneghini, R.

In: Journal of Arthroplasty, 01.01.2018.

Research output: Contribution to journalArticle

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N2 - Background: Dual mobility (DM) bearings are increasingly popular and second-generation designs contain highly cross-linked polyethylene. The purpose of this study is to report head penetration rates in modern DM bearings. Methods: A review of 63 consecutive DM bearings was performed. Radiographs were analyzed for head penetration using Martell methodology at regular postoperative intervals. Results: Thirty-four DM bearings were analyzed. Mean linear head penetration was 1.59 mm/y at 1 year, 1.07 mm/y at 2 years, and 0.27 mm/y at 5 years following an exponential regression model (R2 = 0.999). Mean volumetric wear was 783 mm3/y at 1 year, 555 mm3/y at 2 years, and 104 mm3/y at 5 years following an exponential regression model (R2 = 0.986). Conclusion: Initial head penetration of DM bearings is larger than contemporary cross-linked polyethylene bearings; however, rates approach steady state after 2 years, analogous to traditional bearings. The larger “bedding-in” head penetration may be due to the additional convex bearing surface, creating 2 surfaces for deformation/wear.

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