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International Orthopaedics

, Volume 36, Issue 11, pp 2347–2354 | Cite as

Tip apex distance, hip screw placement, and neck shaft angle as potential risk factors for cut-out failure of hip screws after surgical treatment of intertrochanteric fractures

  • Hagen Andruszkow
  • Michael Frink
  • Cornelia Frömke
  • Amir Matityahu
  • Christian Zeckey
  • Philipp Mommsen
  • Stefanie Suntardjo
  • Christian Krettek
  • Frank Hildebrand
Original Paper

Abstract

Purpose

To describe the quality of osteosynthesis after intertrochanteric fractures evaluation of tip apex distance (TAD) and position of the hip screw have been established. Furthermore, a slightly valgus fracture reduction has been suggested to reduce the risk of cut-out failure. However, uniform recommendations for optimal screw positioning and fracture reduction are still missing. The purpose of our study was to confirm potential risk factors for cut-out of hip screws of intertrochanteric fractures and to provide recommendations for practical clinical use.

Methods

A retrospective analysis of all patients with intertrochanteric fractures treated with a DHS or a gamma nail between January of 2007 and May of 2010 was performed at a level I trauma center.

Results

Two hundred thirty-five patients with intertrochanteric fractures after intra- and extramedullary stabilization were analyzed. A TAD of more than 25 mm was demonstrated to be the most important factor for cut-out in stable and unstable fractures. Fracture reduction with a valgus NSA of 5–10° was associated with a trend towards a lower rate of screw cut-out while an anterior placement of the screw (Parker’s ratio index of <40) significantly increased cut-out incidence.

Conclusions

According to our results, the TAD should not exceed 25 mm in stable (AO/OTA A1) as well as unstable (AO/OTA A2) fractures. An increased anterior hip screw placement should be avoided while fracture reduction with a slight valgus Neck Shaft seems favorable.

Keywords

Fracture Reduction Screw Placement Unstable Fracture Intertrochanteric Fracture Neck Shaft Angle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Hagen Andruszkow
    • 1
  • Michael Frink
    • 1
  • Cornelia Frömke
    • 3
  • Amir Matityahu
    • 2
  • Christian Zeckey
    • 1
  • Philipp Mommsen
    • 1
  • Stefanie Suntardjo
    • 1
  • Christian Krettek
    • 1
  • Frank Hildebrand
    • 1
  1. 1.Trauma DepartmentHannover Medical SchoolHannoverGermany
  2. 2.Department of Orthopedic Surgery, Orthopaedic Trauma InstituteUniversity of California, San Francisco, San Francisco General HospitalSan FranciscoUSA
  3. 3.Institute of Biostatistics, Hannover Medical SchoolHannoverGermany

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