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Influence of cementing the pin on resistance to fracture in hip resurfacing
Publikationstyp
Journal Article
Date Issued
2011
Sprache
English
Author(s)
Siewe, Jan
Bitsch, Rudi G.
Koebke, Jürgen
Eysel, Peer
Journal
Volume
26
Issue
2
Start Page
136
End Page
140
Citation
Clinical Biomechanics 26 (2): 136-140 (2011)
Publisher DOI
Scopus ID
Publisher
Elsevier Science
Background: Since the introduction of modern hip resurfacing systems, there has been a controversy regarding the fixation of the centering pin in the femoral component. It has been suggested that cementing the pin may increase strength of the femoral neck. This in-vitro analysis investigated the influence of a cemented, femoral pin on resistance to fracture in the resurfaced hip. Methods: Five pairs of cadaveric, fresh-frozen femora underwent hip resurfacing (ASR™) using a high viscosity cementing technique. In one side of each pair only the inner surface of the implant was cemented, in the other side, cement was additionally hand-pressurized down the pinhole prior to implantation of the femoral component. Specimen were then mounted on a material testing machine and cyclic loading with increasing load steps was applied until fracture of the femoral neck. Findings: Fracture load was increased (P = 0.013) in the cemented pin group (Median = 4200 N) when compared with the cementless pin group (Median = 2800 N). The number of cycles to failure in the group with the cemented pin (Median = 8072) was likewise higher (P = 0.01) when compared to the group, in which the pin was not cemented (Median = 5906). Interpretation: Cementing the pin may provide additional fixation in hips with low bone mineral density or osteonecrotic lesions, as resistance to fracture could be improved in the presented in-vitro scenario. Although this was shown for a specific hip resurfacing system, this effect might be extrapolated to other, similar implant designs.
Subjects
Cementing pin
Femoral neck fracture
Hip resurfacing
Load
Resistance to fracture
DDC Class
610: Medicine, Health