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Journal of Bone and Joint Surgery - British Volume, Vol 89-B, Issue 7, 962-970.
doi: 10.1302/0301-620X.89B7.18717  
Copyright © 2007 by British Editorial Society of Bone and Joint Surgery
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Cement penetration and primary stability of the femoral component after impaction allografting

A BIOMECHANICAL STUDY IN THE CADAVERIC FEMUR

C. Albert, MASc, PhD Candidate1; S. Patil, FRCS, Consultant Orthopaedic Surgeon2; H. Frei, PhD, Postdoctoral Fellow1; B. Masri, FRCSC, Professor3; C. Duncan, FRCSC, Professor3; T. Oxland, PhD, Professor3; and G. Fernlund, PhD, Associate Professor4

1 Division of Orthopaedic Engineering Research
2 Southern General Hospital, 1345 Govan Road, Glasgow GS14 4TP, UK.
3 Department of Orthopaedics
4 Department of Materials Engineering, University of British Columbia, 910 West 10th Avenue, Vancouver, British Columbia V5Z 4E3, Canada.

Correspondence should be sent to Professor T. Oxland; e-mail: toxland{at}interchange.ubc.ca

This study explored the relationship between the initial stability of the femoral component and penetration of cement into the graft bed following impaction allografting.

Impaction allografting was carried out in human cadaveric femurs. In one group the cement was pressurised conventionally but in the other it was not pressurised. Migration and micromotion of the implant were measured under simulated walking loads. The specimens were then cross-sectioned and penetration of the cement measured.

Around the distal half of the implant we found approximately 70% and 40% of contact of the cement with the endosteum in the pressure and no-pressure groups, respectively. The distal migration/micromotion, and valgus/varus migration were significantly higher in the no-pressure group than in that subjected to pressure. These motion components correlated negatively with the mean area of cement and its contact with the endosteum.

The presence of cement at the endosteum appears to play an important role in the initial stability of the implant following impaction allografting.






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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General