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Journal of Orthopaedics and Traumatology

Official Journal of the Italian Society of Orthopaedics and Traumatology

Fig. 3 | Journal of Orthopaedics and Traumatology

Fig. 3

From: Unexpected early loosening of rectangular straight femoral Zweymüller stems with an alumina-reduced surface after total hip arthroplasty—a prospective, double-blind, randomized controlled trial

Fig. 3

a Evolution of the mean bone mineral density (BMD, in g/cm2, including 95% confidence interval) in the different Gruen zones over time for the NT and the STD stem. b Plot of raw mean bone mineral density (BMD) differences over time from 3 to 24 months postoperatively, grouped in Gruen zone and stem cohort. Abbreviations: fup follow-up in months, G0 STD stem, G1 NT stem, Z1-7 Gruen zones 1–7, mvalue mean value

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