A quantitative analysis of bone support comparing cementless tapered and distal fixation total hip replacements.
The purpose of this study was to develop a technique to accurately assess cementless femoral stem-bone contact. Using this technique, differences in contact patterns between tapered (Synergy) and cylindrical distal fixation (Prodigy) cementless stems were explored. Femurs were prepared and the 2 types of femoral stems were implanted. After implantation, the femurs were imaged in a spiral computed tomography scanner and analyzed using novel custom-developed imaging software. This analysis used a geometric deformable-model UNIX-based software that determined bone-prosthesis contact area. The tapered stem features proximal, cancellous bone contact and a 3-point fixation pattern. The cylindrical distal fixation stem demonstrates cortical support in the distal aspect of the stem.
Howard
James L
JL
Division of Orthopaedic Surgery, London Health Sciences Centre-University Campus, Canada.
Hui
Andrew J
AJ
Bourne
Robert B
RB
McCalden
Richard W
RW
MacDonald
Steven J
SJ
Rorabeck
Cecil H
CH
D000465:Algorithms; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D001696:Biomechanical Phenomena; D001843:Bone Cements; D002102:Cadaver; D005269:Femur / Q000502:physiology* / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D015207:Osteoarthritis, Hip / Q000601:surgery; D011474:Prosthesis Design; D036542:Tomography, Spiral Computed
D001843:Bone Cements