Migration of the uncemented CLS femoral component

The migration of uncemented CLS (Cementless Total Hip Replacement System) f emoral stems was measured retrospectively from standard anteroposterior pel vic radiographs using a digitizer and software specifically designed for th is study. The study population was comprised of 117 patients with 126 uncem ented CLS femoral stems. All radiographs were reviewed and the incidence of thigh pain obtained by means of a questionnaire. The mean clinical follow- up was 3 years and the mean follow-up for radiographic review was 2.77 year s. The mean femoral stem migration was 2 mm at 2 years and 3.66 mm at 7 years. Radiographic features varied little with no specific predictive features i n patients with excessive early migration or those who complained of thigh pain. There was no statistical relationship between the presence of thigh p ain and femoral stem migration.