The influence of design parameters on cortical strain distribution of a cementless titanium femoral stem.
The strain distribution imposed on a femur following a total joint replacement is an important factor, in proximal bone loss due to stress shielding, and long term clinical success. This study investigated how five different design parameters of a cementless titanium femoral prosthesis influenced cortical strains. Test loads were applied and strains were measured with and without an abductor force simulation, using six human cadaveric femora. The cementless design used demonstrated significant calcar loading proximally and a similar strain distribution to the intact femur distally. Implant gross geometry was the major factor in determining the cortical strain distributions under abductor simulation in both axial and torsional loading.
Gillies
R M
RM
Orthopaedic Research Laboratories, Dept of Orthopaedics, University of New South Wales, Prince of Wales Hospital, High Street, Edmund Blackett Building, Randwick 2031, NSW, Australia.
Morberg
P H
PH
Bruce
W J M
WJ
Turnbull
A
A
Walsh
W R
WR
D000368:Aged; D000497:Alloys; D001843:Bone Cements; D002102:Cadaver; D019245:Compressive Strength; D004548:Elasticity; D005269:Femur / Q000502:physiology*; D006622:Hip Prosthesis; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design / Q000379:methods*; D012399:Rotation; D013314:Stress, Mechanical; D014025:Titanium / Q000502:physiology; D016474:Weight-Bearing
D000497:Alloys; D001843:Bone Cements; C031462:titanium alloy (TiAl6V4); D014025:Titanium