Abstract
The purpose of this study is to introduce our technique of free hand screw insertion for scaphoid fractures and clarify the indications of this procedure.
From 1988 to date, we performed this method in 86 cases (75 males and 11 females). Ages ranged from 11 to 73 years (av.: 29). There were 24 cases of acute stable type, 46 of acute unstable and 16 of delayed fibrous union. Screws used were original Herbert screws in 48, other cannulated type screws in 38.
Using an image intensifier, from a small skin incision over the scaphotrapezium joint, a Kirschner wire is inserted to stabilize the fracture temporarily. The wire is pulled volarward to rotate the scaphoid and a second wire is inserted along the intended line of the screw. With the original Herbert screw, after removing the wire, the screw is inserted free-hand. With the other cannulated screws, the second wire is used as guide pin.
Results of 82 cases with follow-up times over 6 months were reviewed. In one case, bony fusion was achieved but revealed symptomatic malunion. In two cases, bony fusion was not achieved. In one of them, an additional bone graft was performed, and good bony union was achieved. In the remaining 79 cases, good bony fusion and good clinical results were achieved.
The best indication for this method is an acute unstable fracture. For acute stable fractures, we recommend this method for three types of patients: those who cannot accept long term immobilization, those who desire to return to athletic activities as soon as possible, and those who also have another fracture in the forearm. It can also be used in cases of delayed fibrous union when good alignment can be achieved and a bone graft is unnecessary.
The abstracts were prepared by Mr Simon Donell. Correspondence should be addressed to him at the Department of Orthopaedics, Norfolk & Norwich Hospital, Level 4, Centre Block, Colney Lane, Norwich NR4 7UY, United Kingdom.
