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Prospective five-year subsidence analysis of a cementless fully hydroxyapatite-coated femoral hip arthroplasty component

Martin Clauss, Catherine Van Der Straeten (UGent) and Marc Goossens
(2014) HIP INTERNATIONAL. 24(1). p.91-97
Author
Organization
Abstract
Early subsidence >1.5 mm is considered to be a predictive factor for later aseptic loosening of the femoral component following total hip arthroplasty (THA). The aim of this study was to assess five-year subsidence rates of the cementless hydroxyapatite-coated twinSys (R) stem (Mathys Ltd., Bettlach, Switzerland). This prospective single-surgeon series examined consecutive patients receiving a twinSys (R) stem at Maria Middelares Hospital, Belgium. Patients aged >85 years or unable to come to follow-up were excluded. Subsidence was assessed using Ein Bild Roentgen Analyse - Femoral Component Analysis (EBRA-FCA). Additional clinical and radiographic assessments were performed. Follow-ups were prospectively scheduled at two, five, 12, 24, and 60 months. In total, 218 THA (211 patients) were included. At five years, mean subsidence was 0.66 mm (95% CI: 0.43-0.90). Of the 211 patients, 95.2% had an excellent or good Harris Hip Score. There were few radiological changes. Kaplan-Meier analysis indicated five-year stem survival to be 98.4% (95% CI: 97.6-100%). Subsidence levels of the twinSys (R) femoral stem throughout the five years of follow-up were substantially lower than the 1.5 mm level predictive of aseptic loosening. This was reflected in the high five-year survival rate.
Keywords
SPOTORNO STEM, EARLY MIGRATION, FOLLOW-UP, EBRA-FCA, PROSTHESES, FAILURE, REPLACEMENT, SURVIVAL, PREDICTION, ARTHRITIS, EBRA-FCA, Prosthesis failure, Prosthesis design, Humans, Hip prosthesis, Hydroxyapatite

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MLA
Clauss, Martin, et al. “Prospective Five-Year Subsidence Analysis of a Cementless Fully Hydroxyapatite-Coated Femoral Hip Arthroplasty Component.” HIP INTERNATIONAL, vol. 24, no. 1, 2014, pp. 91–97, doi:10.5301/hipint.5000082.
APA
Clauss, M., Van Der Straeten, C., & Goossens, M. (2014). Prospective five-year subsidence analysis of a cementless fully hydroxyapatite-coated femoral hip arthroplasty component. HIP INTERNATIONAL, 24(1), 91–97. https://doi.org/10.5301/hipint.5000082
Chicago author-date
Clauss, Martin, Catherine Van Der Straeten, and Marc Goossens. 2014. “Prospective Five-Year Subsidence Analysis of a Cementless Fully Hydroxyapatite-Coated Femoral Hip Arthroplasty Component.” HIP INTERNATIONAL 24 (1): 91–97. https://doi.org/10.5301/hipint.5000082.
Chicago author-date (all authors)
Clauss, Martin, Catherine Van Der Straeten, and Marc Goossens. 2014. “Prospective Five-Year Subsidence Analysis of a Cementless Fully Hydroxyapatite-Coated Femoral Hip Arthroplasty Component.” HIP INTERNATIONAL 24 (1): 91–97. doi:10.5301/hipint.5000082.
Vancouver
1.
Clauss M, Van Der Straeten C, Goossens M. Prospective five-year subsidence analysis of a cementless fully hydroxyapatite-coated femoral hip arthroplasty component. HIP INTERNATIONAL. 2014;24(1):91–7.
IEEE
[1]
M. Clauss, C. Van Der Straeten, and M. Goossens, “Prospective five-year subsidence analysis of a cementless fully hydroxyapatite-coated femoral hip arthroplasty component,” HIP INTERNATIONAL, vol. 24, no. 1, pp. 91–97, 2014.
@article{5747749,
  abstract     = {{Early subsidence >1.5 mm is considered to be a predictive factor for later aseptic loosening of the femoral component following total hip arthroplasty (THA). The aim of this study was to assess five-year subsidence rates of the cementless hydroxyapatite-coated twinSys (R) stem (Mathys Ltd., Bettlach, Switzerland). 
This prospective single-surgeon series examined consecutive patients receiving a twinSys (R) stem at Maria Middelares Hospital, Belgium. Patients aged >85 years or unable to come to follow-up were excluded. Subsidence was assessed using Ein Bild Roentgen Analyse - Femoral Component Analysis (EBRA-FCA). Additional clinical and radiographic assessments were performed. Follow-ups were prospectively scheduled at two, five, 12, 24, and 60 months. 
In total, 218 THA (211 patients) were included. At five years, mean subsidence was 0.66 mm (95% CI: 0.43-0.90). Of the 211 patients, 95.2% had an excellent or good Harris Hip Score. There were few radiological changes. Kaplan-Meier analysis indicated five-year stem survival to be 98.4% (95% CI: 97.6-100%). 
Subsidence levels of the twinSys (R) femoral stem throughout the five years of follow-up were substantially lower than the 1.5 mm level predictive of aseptic loosening. This was reflected in the high five-year survival rate.}},
  author       = {{Clauss, Martin and Van Der Straeten, Catherine and Goossens, Marc}},
  issn         = {{1120-7000}},
  journal      = {{HIP INTERNATIONAL}},
  keywords     = {{SPOTORNO STEM,EARLY MIGRATION,FOLLOW-UP,EBRA-FCA,PROSTHESES,FAILURE,REPLACEMENT,SURVIVAL,PREDICTION,ARTHRITIS,EBRA-FCA,Prosthesis failure,Prosthesis design,Humans,Hip prosthesis,Hydroxyapatite}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{91--97}},
  title        = {{Prospective five-year subsidence analysis of a cementless fully hydroxyapatite-coated femoral hip arthroplasty component}},
  url          = {{http://doi.org/10.5301/hipint.5000082}},
  volume       = {{24}},
  year         = {{2014}},
}
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