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

Wien Klin Wochenschr. 2015 May;127(9-10):375-8. doi: 10.1007/s00508-015-0756-0. Epub 2015 Mar 5.


Background: 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.

Methods: 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.

Results: 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.

Conclusions: 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.

Publication types

  • Clinical Study

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Arthroplasty, Replacement, Hip / methods*
  • Female
  • Femur Head Necrosis / surgery*
  • Follow-Up Studies
  • Hip Prosthesis*
  • Humans
  • Image Interpretation, Computer-Assisted
  • Male
  • Middle Aged
  • Osteoarthritis, Hip / surgery*
  • Postoperative Complications / diagnosis
  • Postoperative Complications / etiology*
  • Prospective Studies
  • Prosthesis Design*
  • Prosthesis Failure*
  • Prosthesis Fitting
  • Radiographic Image Enhancement