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Does PFNA II avoid lateral cortex impingement for unstable peritrochanteric fractures?

George A Macheras1, Stefanos D Koutsostathis, Spyridon Galanakos

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Summary

The PFNA II device effectively prevents lateral cortex impingement and ensures stable fixation for unstable peritrochanteric fractures, unlike its predecessor.

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Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Trauma care

Background:

  • Proximal femoral nail antirotation devices (PFNAs) offer biomechanical advantages over dynamic hip screws for unstable peritrochanteric fractures.
  • The PFNA II was designed to address lateral cortex impingement issues observed with the original PFNA.
  • Clinical evidence is needed to confirm if PFNA II improves outcomes without compromising fixation stability.

Purpose of the Study:

  • To evaluate if the PFNA II design eliminates lateral cortex impingement and fracture displacement compared to PFNA.
  • To assess the stability of fracture fixation and complication rates associated with PFNA II in European patients.

Main Methods:

  • A retrospective comparative study involving 108 patients with unstable peritrochanteric fractures.
  • 58 patients were treated with PFNA and 50 with PFNA II.
  • Key outcomes included nail positioning, complication rates, surgical/fluoroscopy time, blood transfusion, mobilization, hospital stay, fracture union, and Harris hip score.

Main Results:

  • PFNA II demonstrated no instances of lateral cortex impingement or loss of reduction, unlike the PFNA group.
  • All patients treated with PFNA II achieved fracture union without mechanical failure.
  • PFNA II cases showed a trend towards shorter surgical times (23 min vs. 27 min for PFNA).

Conclusions:

  • The PFNA II successfully avoids lateral cortex impingement, a known issue with the PFNA.
  • PFNA II provides fast and stable fixation for unstable peritrochanteric fractures.
  • This suggests PFNA II is a superior option for managing these complex fractures.