Cement strain measurement surrounding loose and well‐fixed femoral component stems

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Abstract
Strain measurement within the cement surrounding stemmed total hip femoral components was accomplished using PMMA encapsulated and embedded strain gauges. Cement strain measurement associated with a well‐bonded stem–cement interface and an unbonded stem–cement interface (i.e., loose prosthesis) was performed. The presence of a stem–cement bond was found to reduce proximal cement strain magnitudes while having little effect on distal cement strain magnitudes. The assurance of a stem–cement bond on only the proximal third of the interface was found to have an effect similar to that of a complete stem–cement bond. The results of this experimental investigation confirm the theoretical prediction that the stem–cement bond is important in maintaining the integrity of the cement mantle surrounding a stemmed femoral component.

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