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Migration characteristics and early clinical results of the NANOS® short-stem hip arthroplasty

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Femoral short stems promise essential advantages in total hip arthroplasty. Up to now, only short- and midterm clinical studies exist. Data on early stem migration that could predict later aseptic loosening at an early stage are rare. The purpose of this study was to assess migration patterns and clinical outcome 2 years after hip replacement by a metaphyseal anchored cementless short stem.


Migration data and clinical results were prospectively assessed in 49 patients. Clinical outcome was measured using the Harris Hip Score (HHS). Migration analyses were performed using the computer-assisted Einzel-Bild-Roentgen-Analyse (EBRA) system.


At 2 years after surgery, none of the implants needed revision, and HHS increased from 47.9 up to 98.1. Of 49 patients, 5 (10 %) showed increased vertical stem migration (1.5 mm/2a) that might predict late aseptic loosening. Of 49 stems, 44 (90 %) showed stable migration patterns indicating a beneficial long-term outcome.


Results of this study confirm the excellent clinical data of previous works. Migration patterns strongly suggest that short-stem arthroplasty is not only an innovative but also a reliable strategy in total hip replacement.

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The authors would like to thank Sabrina Kunze for helping with the data management on behalf of ImplanTec GmbH.

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The authors declare that there is no actual or potential conflicts of interest in relation to this article.

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Correspondence to Martin Kaipel MD.

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Kaipel, M., Grabowiecki, P., Sinz, K. et al. Migration characteristics and early clinical results of the NANOS® short-stem hip arthroplasty. Wien Klin Wochenschr 127, 375–378 (2015).

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