The Journal of Bone and Joint Surgery, Vol 67, Issue 1 48-56, Copyright © 1985 by Journal of Bone and Joint Surgery, Inc
Radiographic analysis of a low-modulus titanium-alloy femoral total hip component. Two to six-year follow-up
A Sarmiento and TA Gruen
We performed a detailed serial radiographic analysis of the femoral
component of 323 cemented low-modulus titanium-alloy total hip prostheses.
There was a low incidence of femoral component loosening as manifested by
radiolucent zones at the stem-cement interface or cement fractures. There
was also a low incidence of resorption of the calcar and cortical
hypertrophy. Comparison of our data with those of others indicated that the
incidence of loosening, calcar resorption, and cortical hypertrophy was
usually lower than with similarly designed conventional high-modulus
Charnley stems. These findings appear to support computer-modeling studies
that have predicted a more even distribution of stresses along the entire
length of the stem of the titanium-alloy prosthesis. Of the two
configurations of femoral components used, the straight stems demonstrated
a significantly lower incidence of radiographic evidence of loosening,
calcar resorption, and cortical hypertrophy than the curved stems did.
These findings have provided sufficient biomechanical rationale for the
evolutionary development of the second-generation femoral components, which
incorporate many features of the straight stem.
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