Characterization of Long-Term Femoral-Head-Penetration Rates

Dowd, James E.; Sychterz, Christi J.; Young, Anthony; Engh, Charles A.

doi:10.2106/00004623-200008000-00006

Cited by 227 publications

(101 citation statements)

References 13 publications

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“…Early followup, however, is important to determine safety of new implants and provide some information regarding possible long-term performance. For example, initial performance of a conventional polyethylene liner has been shown to be predictive of longterm wear [14]. The use of 26-and 28-mm heads in our cohort also may be perceived as a weakness given that Values are expressed as means with ranges in parentheses; UCLA = University of California-Los Angeles.…”

Section: Discussionmentioning

confidence: 99%

“…Heisel et al [22] reported an 81% reduction in clinical wear and a 72% reduction in wear per million cycles in HCLPE compared with conventional polyethylene in early followup. The 5-year wear data for Durasul 1 (Zimmer, Warsaw, IN) HCLPE in patients with a mean age in their 60s had a linear wear rate of 0.029 mm per year, well below the 0.10 mm per year average threshold for osteolysis [13,14,43,44]. Durasul 1 is manufactured by electron beam radiation with 9.5 Mrad at 120°C; it then is remelted at 150°C and stored in ethylene oxide.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies have shown a direct correlation between the amount of polyethylene wear occurring in THAs and the rate of osteolysis [14,43]. According to one study, wear rates less than 0.1 mm per year were associated with a zero incidence of osteolysis, but rates exceeding 0.3 mm per year were associated with a 100% incidence of osteolysis [14].…”

Section: Introductionmentioning

confidence: 99%

“…According to one study, wear rates less than 0.1 mm per year were associated with a zero incidence of osteolysis, but rates exceeding 0.3 mm per year were associated with a 100% incidence of osteolysis [14]. Alternative bearing surfaces such as ceramic-onceramic, metal-on-metal, and metal-on-HCLPE endeavor to decrease the production of biologically active particulate matter, thereby theoretically decreasing the incidence of osteolysis.…”

Section: Introductionmentioning

confidence: 99%

“…It is unclear, however, whether these wear rates apply to a younger population in whom one might anticipate relatively higher wear rates. Conventional polyethylene has had a linear wear rate with time that allows the prediction of long-term polyethylene wear [14]. HCLPE also may have a linear wear rate with time such that short-term wear characteristics may predict long-term performance.…”

Section: Introductionmentioning

confidence: 99%

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THA with Highly Cross-linked Polyethylene in Patients 50 Years or Younger

Shia¹,

Clohisy²,

Schinsky³

et al. 2009

Clinical Orthopaedics &Amp; Related Research

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Highly cross-linked polyethylene has been associated with low in vitro wear, but also has decreased in vitro ultimate yield strength. We therefore asked whether highly cross-linked polyethylene would result in lower outcome scores, wear, or early failure in a young patient population. Seventy THAs in 64 patients were performed using a highly cross-linked (electron beam-irradiated to 9 Mrads) acetabular liner and a cobalt-chrome femoral head. The average age of the patients at surgery was 41 years (range, 19-50 years). The minimum followup was 2.4 years (average, 4 years; range, 2.4-6.5 years). We recorded demographic and clinical data, including Harris hip score. Polyethylene wear measurements were analyzed with a validated, computer-assisted, edge detection method. The average Harris hip score improved from 53 to 92 at last followup. There was no evidence of acetabular or femoral loss of fixation, subsidence, or loosening. Linear wear was undetectable at this followup interval. No patient experienced catastrophic failure or underwent revision surgery. These data show low polyethylene wear rates and no catastrophic failures at early followup in a young patient cohort.

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Section: Discussionmentioning

confidence: 99%