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Journal of Hand Surgery (British and European Volume)
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Articles

Biomechanical Evaluation of a New Composite Bioresorbable Screw

C. A. BAILEY
J. H. KUIPER
C. P. KELLY

From the Hand and Upper Limb Unit, Robert Jones and Agnes Hunt Hospital, Oswestry, Shropshire, UK

Correspondence: Mr Chris Bailey, MRCS, Specialist Registrar, Hand and Upper Limb Unit, Robert Jones and Agnes Hunt Hospital, Oswestry, Shropshire SY10 7AG, UK. Tel.: +1691 404221; fax: +1691 404426. E-mail: cabailey{at}tinyworld.co.uk

A new bioresorbable composite cannulated screw has been developed for small bone fracture fixation. The LG ("Little Grafter") screw is manufactured from BiosteonTM, which is a composite of poly L-lactic acid and hydroxyapatite. This study aimed to compare interfragmentary compression generated by this new screw with conventional metal screws commonly used in scaphoid fracture fixation. Four small metallic screws were compared with the LG screw, using a bone model produced from rigid polyurethane foam. The screws included the Acutrak, Asnis III, Herbert and Herbert–Whipple screws. The mean maximum compression forces for the LG screw, the Asnis and the Acutrak were comparable (LG 32.3 N, Asnis 32.8 N, Acutrak 38.3 N), whereas those using the Herbert and the Herbert–Whipple screw were significantly lower (Herbert 21.8 N, Herbert–Whipple 19.9 N). The bioresorbable LG screw has been shown to have good compressive properties compared to commonly used small bone fragment compression screws.

Key Words: bioresorbable • compression strength • fracture • scaphoid • screw • small fragment

Journal of Hand Surgery (British and European Volume), Vol. 31, No. 2, 208-212 (2006)
DOI: 10.1016/J.JHSB.2005.10.015
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