In vitro analysis of Exeter stem torsional stability
The effect of cyclic loading on the torsional stiffness of a polished double tapered femoral stem was investigated in vitro. Initial torsional stability was compared to torsional stability following cyclic loading. Stems were removed from the cement mantle and reinserted without the use of additional cement. Torsional stability was measured following reinsertion and following further cyclic loading.
Subsidence of the stem was observed. No difference in torsional stiffness was observed during loading. No difference between the stiffness prior to extraction and following reinsertion was observed.
Torsional stiffness of an Exeter stem does not decrease following axial subsidence under cyclic loading. Stability is retained following reinsertion into the original cement mantle. Debonding of the Exeter stem is not associated with rotational instability of the implant.
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