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A Biomechanical Analysis of Intrascaphoid Compression Using the Herbert Scaphoid Screw System

An in vitro cadaveric study

From the Musculoskeletal Research Laboratory, Hand and Upper Limb Centre, St Joseph’s Health Centre, London, Ontario, Canada

Correspondence: D. C. Chess MD FRCSC, Hand and Upper Limb Centre, St Joseph’s Health Centre, 268 Grosvenor Street, London, Ontario, Canada N6A 4L6.

The purpose of this study was to evaluate the compressive capabilities of the Herbert scaphoid screw system. A transverse osteotomy was performed at the waist of eight scaphoids removing a 3 mm wafer of bone. A custom-designed load washer was inserted within this defect to measure intrascaphoid compression during Huene guide application, during screw insertion, after screw insertion and after guide release. The intrascaphoid compression was noted to peak during screw insertion; however it dramatically decreased without any clinical subjective evidence of decreased insertional torque by the surgeon. The average final compression as a percentage of maximal compression was 38 (SD 26) %.

Journal of Hand Surgery (British and European Volume), Vol. 23, No. 2, 209-213 (1998)
DOI: 10.1016/S0266-7681(98)80176-9


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