Effect of Taper Design on Trunnionosis in Metal on Polyethylene Total Hip Arthroplasty

Abstract This study examines how taper design affects corrosion and fretting at the head trunnion surface. All hip prostheses retrieved between 1999 and 2013 with 28 mm/+ 0 heads were selected, resulting in 44 cobalt-chrome-on-polyethylene implants, representing six taper designs. Mean implantation...

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Bibliographic Details
Published in:The Journal of arthroplasty 2015-07, Vol.30 (7), p.1269-1272
Main Authors: Tan, Sok Chuen, MBBS, FRCS (Edin), Teeter, Matthew G., PhD, Del Balso, Christopher, BSc (Hons), MSc, MBBS, Howard, James L., MD, MSc, FRCSC, Lanting, Brent A., MD, MSc, FRCSC
Format: Article
Language:English
Subjects:
Aged
Aged, 80 and over
Arthroplasty, Replacement, Hip - instrumentation
Chromium Alloys - chemistry
Cobalt - chemistry
Corrosion
Female
Femur Head - surgery
Hip Prosthesis
Humans
Male
metal-on-polyethylene
Metals - chemistry
Middle Aged
Orthopedics
Polyethylene - chemistry
Prosthesis Design
Prosthesis Failure
taper corrosion
taper design
Torque
total hip arthroplasty
trunnionosis
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Summary:Abstract This study examines how taper design affects corrosion and fretting at the head trunnion surface. All hip prostheses retrieved between 1999 and 2013 with 28 mm/+ 0 heads were selected, resulting in 44 cobalt-chrome-on-polyethylene implants, representing six taper designs. Mean implantation time: 8.9 ± 3.7 years. The femoral head tapers were scored for fretting and corrosion using the Goldberg scale as both a combined score and by three zones (apex, central and base). There was no difference in age ( P = 0.34), BMI ( P = 0.29), or implantation time ( P = 0.19) between taper groups. The 11/13 taper had the highest combined corrosion and fretting score, but no difference ( P = 0.22) between groups for combined scores ( P = 0.22 for corrosion, P = 0.19 for fretting). In a zone-specific analysis, the 11/13 taper had highest corrosion score at base zone ( P = 0.02). Taper design had a significant effect on corrosion at base of trunnion.
ISSN:0883-5403
1532-8406
DOI:10.1016/j.arth.2015.02.031