In-vitro evaluation of fatigue failure of locking screws in solid tibial nails

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• 作者：C. G?bler ; E. K. Tschegg ; M. Greitbauer ; S. Stanzl-Tschegg ; G. E. Wozasek ; W. Laube and V. Vécsei
• 关键词：Key words Solid tibial nail ? Locking screws ? Fatigue failure ? Mechanical fatigue testing
• 刊名：Der Unfallchirurg
• 出版年：1999
• 出版时间：January1999
• 年：1999
• 卷：102
• 期：1
• 页码：29-34
• 全文大小：274 KB
• 刊物类别：Medicine
• 刊物主题：Medicine & Public Health
  Traumatic Surgery
  Medicine/Public Health, general
  Sports Medicine
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1433-044X

文摘

Unreamed nailing with solid tibial nails is an accepted method of treatment for open tibial shaft fractures up to grade III and of closed tibial fractures with severe soft tissue damage. However, fatigue failure of the distal locking bolts is a frequent complication. We report a mechanical study investigating the fatigue limit of six different types of locking bolts used in solid tibial nails (Biorigid Tibial nail/aap, UTN/ace, STN/Howmedica, TLN/Howmedica, ΔR & T Tibial nail/Smith & Nephew, AO/ASIF UTN/Synthes). Our results prove a direct correlation between the bolt's diameter and mechanical properties. Further more we found that bolts with a continuing thread were weaker than bolts of the same diameter with only a short thread and an increased diameter at the nail's aperture. Our results suggest that mobilization with half of the average body weight (350N) allows osseous consolidation without fatigue failure of any of the tested locking bolts. Some of the tested locking bolts may even withstand full weight-bearing in a physiological walking cycle, but will not withstand the stress of a running cycle.