Periacetabular osteolysis is a potentially difficult surgical challenge, which can often drive the choice of reconstruction methods used in revision hip replacement. For smaller defects, impaction of bone grafts may be sufficient, but larger defects can require filler materials that provide structural support in addition to filling a void. This study utilized finite element analysis (FEA) to examine the state of stress in periprosthetic pelvic bone when subjected to a stair-climbing load and in the presence of two simulated defects, to show the effect of implanting a defect repair implant fabricated from Trabecular Metal™. Even a small medial bone defect showed a local stress elevation of compared with that seen with an acetabular implant supported by intact periacetabular bone. Local bone stress was much greater ( the baseline level) for a defect case in which the loss of bone superior to the acetabular implant permitted significant migration. FEA results showed that a repair of the small defect with a Trabecular Metal™ restrictor lowered periprosthetic bone stress to a level comparable to that in the case of a primary implant. For the larger defect case, the use of a Trabecular Metal™ augment provides structural stabilization and helps to restore the THR head center. However, stress in the adjacent periprosthetic bone is lower than that observed in the defect-free acetabulum. In the augment case, the load path between the femoral head and the pelvis now passes through the augment as the superior rim of the acetabulum has been replaced. Contact-induced stress in the augment is similar in magnitude to that seen in the superior rim of the baseline case, although the stress pattern in the augment is noticeably different from that in intact bone.
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February 2010
Research Papers
Repair of Periprosthetic Pelvis Defects With Porous Metal Implants: A Finite Element Study
Mehul A. Dharia,
Mehul A. Dharia
Orthopaedic Implant Division,
Zimmer, Inc.
, Warsaw, IN 46580
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Eik Siggelkow,
Eik Siggelkow
Orthopaedic Implant Division,
Zimmer GmbH
, Winterthur CH-4804, Switzerland
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Roy D. Crowninshield,
Roy D. Crowninshield
Crowninshield, Inc.
, Asheville, NC 28803
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Dale A. Degroff,
Dale A. Degroff
Orthopaedic Implant Division,
Zimmer, Inc.
, Warsaw, IN 46580
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Douglas H. Wentz
Douglas H. Wentz
Orthopaedic Implant Division,
Zimmer, Inc.
, Warsaw, IN 46580
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Danny L. Levine
Mehul A. Dharia
Orthopaedic Implant Division,
Zimmer, Inc.
, Warsaw, IN 46580
Eik Siggelkow
Orthopaedic Implant Division,
Zimmer GmbH
, Winterthur CH-4804, Switzerland
Roy D. Crowninshield
Crowninshield, Inc.
, Asheville, NC 28803
Dale A. Degroff
Orthopaedic Implant Division,
Zimmer, Inc.
, Warsaw, IN 46580
Douglas H. Wentz
Orthopaedic Implant Division,
Zimmer, Inc.
, Warsaw, IN 46580J Biomech Eng. Feb 2010, 132(2): 021006 (9 pages)
Published Online: January 29, 2010
Article history
Received:
April 24, 2008
Revised:
October 15, 2009
Posted:
December 17, 2009
Published:
January 29, 2010
Online:
January 29, 2010
Citation
Levine, D. L., Dharia, M. A., Siggelkow, E., Crowninshield, R. D., Degroff, D. A., and Wentz, D. H. (January 29, 2010). "Repair of Periprosthetic Pelvis Defects With Porous Metal Implants: A Finite Element Study." ASME. J Biomech Eng. February 2010; 132(2): 021006. https://doi.org/10.1115/1.4000853
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