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Stem anteversion in total hip arthroplasty is well known to have a high impact on dislocation, but empirical data regarding the clinical and biomechanical influence is lacking. Therefore, we evaluated the impact of different anteversion alignments on the primary stability and strain distribution of a cementless stem. The cementless CLS Spotorno stem was implanted in 3 different groups (each group n=6, total n=21) with different anteversion alignments reference anteversion (8°), +15° torsion in anteversion (+23°), -15° torsion in retrov