Biomechanical Variables Affecting Stability and Stresses in the Fractured Femur During Intramedullary Nailing / MC. Sherman, AF. Tencer, KD. Johnson
- Conference Author:
- Intramedullary Rods: Clinical Performance and Related Laboratory Testing (1987 : Cincinnati, Ohio)
- Physical Description:
- 1 online resource (21 pages) : illustrations, figures, tables
- Additional Creators:
- Sherman, MC.
American Society for Testing and Materials
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- Closed intramedullary nailing is an accepted method of treatment for femoral shaft fractures. Technical complications of this procedure include fracture instability, which may result in nail migration and malrotation, and femoral bursting during nail insertion. These complications were investigated in terms of geometric and mechanical parameters of the bone-implant system. Mechanical test results indicate that nails of the same nominal size from different manufacturers possess more than a twofold difference in flexural rigidity and a threefold difference in torsional modulus. These differences are due to variations on the cross-sectional shape and wall thickness. Measurements in insertion force and hoop stress in cadaver femora were significantly different for most of the nails tested due to differences in mechanical and geometric properties. Insertion forces in the distal fracture component were consistently lower than those in the proximal fracture component and decreased linearly with component length. Increasing the reamed diameter in the distal component 1 mm over the nail size decreased the insertion forces significantly. The most significant variable affecting femoral bursting was found to be the placement of the starting hole. Anterior offset from the neutral axis of the canal by more than 6.0 mm consistently resulted in excessive hoop stresses and femoral bursting. Case reports are presented to illustrate these biomechanical principles clinically.
- Dates of Publication and/or Sequential Designation:
- Volume 1989, Issue 1008 (January 1989)
- 9780803150737 (e-ISBN)
- Digital File Characteristics:
- text file PDF
- Bibliography Note:
- Includes bibliographical references 40.
- Other Forms:
- Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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- Reproduction Note:
- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1989. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
- Technical Details:
- Mode of access: World Wide Web.
- Source of Acquisition:
- ASTM International PDF Purchase price USD25.
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