Alex Allepuz1, Leif Havelin2, Thomas Barber3, Art Sedrakyan4, Stephen Graves5, Barbara Bordini6, Daniel Hoeffel7, Guy Cafri8, Elizabeth Paxton8. 1. Novartis Farmacéutica, SA, Carrer de la Marina, 206, 08013 Barcelona, Spain. 2. The Norwegian Arthroplasty Register, Department of Orthopaedic Surgery, Haukeland University Hospital, Mollendalsbakken 11, N-5021 Bergen, Norway. 3. Department of Orthopedic Surgery, Kaiser Permanente, 280 West MacArthur Boulevard, Oakland, CA 94611. 4. Weill Cornell Medical College, 402 East 67th Street, New York, NY 10065. 5. Australian Orthopaedic Association National Joint Replacement Registry, Discipline of Public Health, MDP DX 650 511, University of Adelaide, Adelaide, SA 5005, Australia. 6. Register of the Orthopaedic Prosthetic Implants (RIPO), c/o Medical Technology Laboratory, Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136 Bologna, Italy. 7. Summit Orthopedics, 2090 Woodwinds Drive, St. Paul, MN 55125. 8. Surgical Outcomes & Analysis Department, Kaiser Permanente, 8954 Rio San Diego Drive, Suite 406, San Diego, CA 92108.
Abstract
BACKGROUND: HXLPE (highly cross-linked polyethylene) has greater wear resistance compared with UHMWPE (ultra-high molecular weight polyethylene), which may contribute to improving the outcomes of total hip arthroplasty with a large femoral head. However, no information is available regarding the effect of femoral head size on the survivorship of HXLPE hip prostheses. The aim of the present study was to provide evidence regarding whether femoral head size has an effect on the risk of revision when an HXLPE liner is used on a metal head. METHODS: A distributed health data network was developed by the ICOR (International Consortium of Orthopaedic Registries). Six national and regional registries are participating in this network: Kaiser Permanente, HealthEast, the Emilia-Romagna region in Italy, the Catalan region in Spain, Norway, and Australia. Data from each registry were standardized and provided at an aggregate level for each of the variables of interest. Patients with osteoarthritis who were forty-five to sixty-four years of age and had undergone uncemented total hip arthroplasty were included in the present study. Analyses were performed on the basis of individual patient profiles, utilizing the variables collected from each registry. The outcome of interest was the time to the first revision (for any reason). Survival probabilities and their standard errors were extracted from each registry for each unique combination of the covariates and were combined through multivariate meta-analysis utilizing linear mixed models to compare survivorship for <32-mm, 32-mm, and >32-mm femoral head sizes. RESULTS: A total of 14,372 total hip arthroplasties were included in the study. The five-year rate of revision surgery varied from 1.9% to 3.2% among registries. The risk of revision did not differ significantly between <32-mm and 32-mm head sizes (HR [hazard ratio] = 0.91, 95% CI [confidence interval] = 0.69 to 1.19) or between >32-mm and 32-mm sizes (HR = 1.05, 95% CI = 0.70 to 1.55). CONCLUSIONS: The results of our study provide relevant data to orthopaedic surgeons deciding on the use of a larger articulation in a metal-on-polyethylene bearing. A larger head diameter should not be considered a detriment to device survival when an HXLPE liner is used. However, efforts to force the use of a large-size implant appear unsupported, as similar survivorship was observed for all head diameter groups.
BACKGROUND: HXLPE (highly cross-linked polyethylene) has greater wear resistance compared with UHMWPE (ultra-high molecular weight polyethylene), which may contribute to improving the outcomes of total hip arthroplasty with a large femoral head. However, no information is available regarding the effect of femoral head size on the survivorship of HXLPE hip prostheses. The aim of the present study was to provide evidence regarding whether femoral head size has an effect on the risk of revision when an HXLPE liner is used on a metal head. METHODS: A distributed health data network was developed by the ICOR (International Consortium of Orthopaedic Registries). Six national and regional registries are participating in this network: Kaiser Permanente, HealthEast, the Emilia-Romagna region in Italy, the Catalan region in Spain, Norway, and Australia. Data from each registry were standardized and provided at an aggregate level for each of the variables of interest. Patients with osteoarthritis who were forty-five to sixty-four years of age and had undergone uncemented total hip arthroplasty were included in the present study. Analyses were performed on the basis of individual patient profiles, utilizing the variables collected from each registry. The outcome of interest was the time to the first revision (for any reason). Survival probabilities and their standard errors were extracted from each registry for each unique combination of the covariates and were combined through multivariate meta-analysis utilizing linear mixed models to compare survivorship for <32-mm, 32-mm, and >32-mm femoral head sizes. RESULTS: A total of 14,372 total hip arthroplasties were included in the study. The five-year rate of revision surgery varied from 1.9% to 3.2% among registries. The risk of revision did not differ significantly between <32-mm and 32-mm head sizes (HR [hazard ratio] = 0.91, 95% CI [confidence interval] = 0.69 to 1.19) or between >32-mm and 32-mm sizes (HR = 1.05, 95% CI = 0.70 to 1.55). CONCLUSIONS: The results of our study provide relevant data to orthopaedic surgeons deciding on the use of a larger articulation in a metal-on-polyethylene bearing. A larger head diameter should not be considered a detriment to device survival when an HXLPE liner is used. However, efforts to force the use of a large-size implant appear unsupported, as similar survivorship was observed for all head diameter groups.
Authors: Richard W McCalden; Steven J MacDonald; Cecil H Rorabeck; Robert B Bourne; David G Chess; Kory D Charron Journal: J Bone Joint Surg Am Date: 2009-04 Impact factor: 5.284
Authors: Art Sedrakyan; Stephen Graves; Barbara Bordini; Miquel Pons; Leif Havelin; Susan Mehle; Elizabeth Paxton; Thomas Barber; Guy Cafri Journal: J Bone Joint Surg Am Date: 2014-12-17 Impact factor: 5.284
Authors: Art Sedrakyan; Elizabeth Paxton; Stephen Graves; Rebecca Love; Danica Marinac-Dabic Journal: J Bone Joint Surg Am Date: 2014-12-17 Impact factor: 5.284
Authors: Ove Furnes; Elizabeth Paxton; Guy Cafri; Stephen Graves; Barbara Bordini; Thomas Comfort; Moises Coll Rivas; Samprit Banerjee; Art Sedrakyan Journal: J Bone Joint Surg Am Date: 2014-12-17 Impact factor: 5.284
Authors: Elizabeth Paxton; Guy Cafri; Leif Havelin; Susanna Stea; Francesc Pallisó; Stephen Graves; Daniel Hoeffel; Art Sedrakyan Journal: J Bone Joint Surg Am Date: 2014-12-17 Impact factor: 5.284
Authors: Jeffrey B Stambough; Gail Pashos; Ningying Wu; Jacob A Haynes; John M Martell; John C Clohisy Journal: J Arthroplasty Date: 2015-10-28 Impact factor: 4.757