[Photoelastic study of fragment compression in fracture of the femoral neck stabilized with the Zespol hip fixator].

The paper presents analysis of the forces within fracture line of femoral neck stabilized with Zespol hip fixator. The investigation has been carried out on specifically designed model of the proximal femur; the forces were measured in photoelastic fashion with the use of epoxy resin cubes as dynamometers. The magnitude of forces within fracture line has been verified and related to the position of the platforms of the screws versus the plate before tightening the nuts.