J‐integral fracture toughness and tearing modulus measurement of radiation cross‐linked UHMWPE

Journal of Orthopaedic Research - Tập 20 Số 6 - Trang 1152-1156 - 2002
Andreas H. Gomoll1, T Wanich, Anuj Bellare
1Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, Brigham and Women’s Hospital, Harvard Medical School, 75 Francis Street, MRB 106, Boston, MA 02135, USA

Tóm tắt

AbstractRadiation and chemical cross‐linking of medical grade ultrahigh molecular weight polyethylene (UHMWPE) has recently been utilized in an effort to improve wear performance of total joint replacement components. However, reductions in mechanical properties with cross‐linking are cause for concern regarding the use of cross‐linked UHMWPE for high‐stress applications such as in total knee replacement prostheses. In this study, the fracture behavior of radiation cross‐linked UHMWPE was compared to that of uncross‐linked UHMWPE. The Rice and Sorensen model that utilizes mechanical parameters obtained from uniaxial tensile and compact tension tests was used to calculate the steady state J‐integral fracture toughness, Jss, for radiation cross‐linked UHMWPE. Jss decreased monotonically with increase in radiation dose. UHMWPE exhibited tough, ductile tearing behavior with stable crack growth when it was cross‐linked using a gamma radiation dose of 0–50 kGy. However, in cross‐linked UHMWPE irradiated to a dose of 100 and 200 kGy, unstable fracture occurred spontaneously upon attaining the initial crack driving force, J1c. This indicates that a high degree of cross‐linking is less desirable for high‐stress applications in orthopaedic implants. However, a substantial increase in J1c, even at a low degree of cross‐linking, suggests that a low degree of cross‐linking may be beneficial for resistance to delamination and catastrophic failure, both of which require an initiation step for the fracture to propagate in the material. This mechanical test should, however, be considered along with fatigue tests and joint simulator testing before determination of an appropriate amount of cross‐linking for total joint replacement prostheses that experience high stresses.© 2002 Orthopaedic Research Society. Published by Elsevier Science Ltd. All rights reserved.

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Tài liệu tham khảo

BakerDA BellareA PruittLA.Fatigue analysis of crosslinked UHMWPE: an evaluation of resistance to initiation and propagation of flaws at varying crosslink densities. 11th Int Conf Deformation Yield and Fracture of Polymers Cambridge/UK 2000. p.69–72.

10.1002/(SICI)1097-4636(19990915)46:4<573::AID-JBM16>3.0.CO;2-A

Baldini T, 1997, The effect of resin type and sterilization method on the static (J‐integral) fracture resistance of UHMW polyethylene, Trans Orthop Res Soc, 22, 780

10.1016/0032-3861(89)90184-5

Duus LC, 2000, The effect of resin grade, manufacturing method and cross linking on the fracture toughness of commercially available UHMWPE, Trans Orthop Res Soc, 25, 544

Gillis AM, 1999, An independent evaluation of the mechanical, chemical and fracture properties of UHMWPE cross linked by 34 different conditions, Trans Orthop Res Soc, 24, 908

10.1016/0032-3861(87)90215-1

10.1002/(SICI)1097-4636(199606)31:2<257::AID-JBM13>3.0.CO;2-I

KumarV GermanM ShihC.An engineering approach for elastic‐plastic fracture analysis. NP‐1931 research project 1237–1. General Electric Company 1981.

10.1016/S0142-9612(99)00053-8

10.1016/S0142-9612(99)00038-1

Levine D, 1999, Mechanical behavior of UHMWPE characterized by uniaxial and biaxial tension tests, Trans Orthop Res Soc, 24, 820

10.2106/00004623-199407000-00020

Maguire J, 1987, Foreign body reaction to polymeric debris following total hip arthroplasty, Clin Orthop, 216, 213, 10.1097/00003086-198703000-00035

McKellop H, 1995, The origin of submicron polyethylene wear debris in total hip arthroplasty, Clin Orthop, 311, 3

10.1002/jor.1100170203

10.1016/0032-3861(95)99294-5

10.1016/S0142-9612(99)00039-3

Muratoglu O, 1999, A novel method of crosslinking UHMWPE to improve wear with little or no sacrifice on mechanical properties, Trans Orthop Res Soc, 24, 829

O'Connor DO, 1999, Wear and high cycle fatigue of a highly crosslinked UHMWPE, Trans Orthop Res Soc, 24, 816

10.1016/0022-5096(78)90007-8

Total Hip Replacement. NIH Consensus Statement 1994. p.1–31.

Wunderlich B, 1967, Heat of fusion of polyethylene, J Polym Sci, Part A‐2, 5, 987, 10.1002/pol.1967.160050514

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Journal of Orthopaedic Research

Tập 20 Số 6

1152-1156

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