Comminuted fractures of the olecranon treated by the Weber-Vasey technique.
Summary Eleven patients with comminuted fractures of the olecranon have been treated by the Weber-Vasey technique. The operation, complications, and results are discussed.
Comminuted fractures of the olecranon: an appliance for internal fixation.
An appliance, the olecranon spike-plate, is described for use in the internal fixation of fractures of the olecranon where standard methods may be unsuitable. Some of these methods are reviewed. Two illustrative cases are presented, the problems of cancellous bone fixation are discussed, and possible complications of this procedure are commented upon.
Dimensional Errors of Fixtures, Locating and Measurement Datum Features in the Stream of Variation Modeling in Machining
Machining processes are usually multi-station processes involving a large number of operations and several locating datum changes. Machining errors are thus introduced, transformed and accumulated as the workpiece is being machined. This paper introduces procedures for expressing the influence of errors in fixtures, locating datum features and measurement datum features on dimensional errors in machining. These procedures are essential in the derivation of the Stream of Variation model of dimensional machining errors using the CAD/CAPP parameters of the machining process. The linear state space form of the Stream of Variation model allows for advanced control theory achievements to be employed in formal solutions to problems in multi-station machining. Modeling procedures presented in this paper were experimentally verified in machining of an automotive cylinder head.