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Dissemination of Wear Particles to the Liver, Spleen, and Abdominal Lymph Nodes of Patients with Hip or Knee Replacement*
Robert M. Urban, †; Joshua J. Jacobs, M.D.†; Michael J. Tomlinson, D.V.M., PH.D.†; John Gavrilovic, PH.D.‡; Jonathan Black, PH.D.§; Michel Peoc'h, M.D.#
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Investigation performed at the Department of Orthopedic Surgery, The Rush Arthritis and Orthopedic Institute, Rush-Presbyterian-St. Luke's Medical Center, Chicago, Illinois
*One or more of the authors has received or will receive benefits for personal or professional use from a commercial party related directly or indirectly to the subject of this article. In addition, benefits have been or will be directed to a research fund, foundation, educational institution, or other nonprofit organization with which one or more of the authors is associated. Funds were received in total or partial support of the research or clinical study presented in this article. The funding sources were National Institutes of Health Grant AR39310, the Crown Family Chair in Orthopedic Surgery, and Zimmer USA.
†Department of Orthopedic Surgery, Rush-Presbyterian-St. Luke's Medical Center, 1653 West Congress Parkway, Chicago, Illinois 60612. E-mail address for R. M. Urban: rurban@rush.edu.
‡McCrone Associates, 850 Pasquinelli Drive, Westmont, Illinois 60559.
§IMN Biomaterials, 409 Dorothy Drive, King of Prussia, Pennsylvania 19406.
#Service D'Anatomie Pathologique, Centre Hospitalier Regional et Universitaire, 38043 Grenoble, France.

J Bone Joint Surg Am, 2000 Apr 01;82(4):457-457
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Background: The importance of particles generated by wear and corrosion of joint replacement prostheses has been understood primarily in the context of the local effects of particle-induced periprosthetic osteolysis and aseptic loosening. We studied dissemination of wear particles in patients with total hip and knee replacement to determine the prevalence of and the histopathological response to prosthetic wear debris in the liver, spleen, and abdominal para-aortic lymph nodes.

Methods: Postmortem specimens from twenty-nine patients and biopsy specimens from two living patients with a failed replacement were analyzed. Specimens of tissue obtained from the cadavera of fifteen patients who had not had a joint replacement served as controls. The concentration of particles and the associated tissue response were characterized with the use of light microscopy of stained histological sections. Metallic particles were identified by electron microprobe analysis. Polyethylene particles were studied with the use of oil-red-O stain and polarized light microscopy. The composition of polyethylene particles was confirmed in selected cases by Fourier transform infrared spectroscopy and hot-stage thermal analysis.

Twenty-one of the patients studied post mortem had had a primary total joint replacement. Eleven of them had had a hip prosthesis for a mean of sixty-nine months (range, forty-three to 171 months), and ten had had a knee replacement for a mean of eighty-four months (range, thirty-one to 179 months). The other eight patients studied post mortem had had a hip replacement in which one or more components had loosened and had been revised. The mean time between the initial arthroplasty and the time of death was 174 months (range, forty-seven to 292 months), and the mean time between the last revision procedure and the time of death was seventy-one months (range, one to 130 months).

Results: Metallic wear particles in the liver or spleen were more prevalent in patients who had had a failed hip arthroplasty (seven of eight) than in patients who had had a primary hip (two of eleven) or knee replacement (two of ten). The principal source of wear particles in the majority of these patients involved secondary nonbearing surfaces rather than wear between the two primary bearing surfaces as intended. In one living patient, dissemination of titanium alloy particles from a hip prosthesis with mechanical failure was associated with a visceral granulomatous reaction and hepatosplenomegaly, which required operative and medical treatment.

Metallic wear particles were detected in the para-aortic lymph nodes in 68 percent (nineteen) of the twenty-eight patients with an implant from whom lymph nodes were available for study. In 38 percent (eleven) of all twenty-nine patients with an implant who were studied post mortem, metallic particles had been further disseminated to the liver or spleen, where they were usually found within small aggregates of macrophages occurring as infiltrates without apparent pathological importance. Polyethylene particles elicited a similar response. They were identified in the para-aortic lymph nodes of 68 percent (nineteen) of the twenty-eight patients and the liver or spleen of 14 percent (four) of the twenty-nine patients. The majority of the disseminated wear particles were less than one micrometer in size. Currently available methods lack the sensitivity and specificity necessary to detect very low concentrations of submicrometer polyethylene particles and probably underestimated the prevalence of polyethylene wear debris in the liver and spleen.

Conclusions: In this study, systemic distribution of metallic and polyethylene wear particles was a common finding, both in patients with a previously failed implant and in those with a primary total joint prosthesis. The prevalence of particles in the liver or spleen was greater after reconstructions with mechanical failure. In the majority of patients, the concentration of wear particles in these organs was relatively low and without apparent pathological importance. However, in one rare case, granulomas formed in the liver, spleen, and abdominal lymph nodes in response to heavy accumulation of wear debris from a hip prosthesis with mechanical failure and compromised hepatic function.

Clinical Relevance: These findings underscore the necessity of minimizing the production of particulate debris by joint replacement devices and the need for the surgeon to consider expeditious revision in patients in whom large amounts of particulate debris may be generated. Serum and urine trace-metal analyses may provide early confirmation of failure and aid in the timing of a revision operation in a patient with a symptomatic or failed device.

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    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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