Cases reported "Fractures, Ununited"

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1/4. Difficulty in removal of the distal locking device of the Brooker-wills tibial nail.

    Complications in removal of the Brooker-wills tibial nail were encountered in eight patients, and breakage of the distal fins occurred in four of these patients. Although none of the patients experienced residual effects related to removal of the tibial nail, the procedure is associated with potential risks such as infection or nonunion. Three methods of nail removal are described.
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keywords = breakage
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2/4. Mechanical strength and optimal site of placement of a threaded bone screw assessed on the basis of the screw breakage for non-union of the scaphoid: a biomechanical study.

    We have performed the surgical procedure on the patients with the fracture of the scaphoid using mini-acutrak screws (ACUMED, Inc.). A 25-year-old man was injured in a fall. Surgical treatment for non-union of the scaphoid using a mini-acutrak screw was performed. However, this screw was broken, despite the absence of any obvious trauma mechanism. A structural examination was performed with a metal microscope and a hardness test was performed. A hardness evaluation was conducted on this broken screw and similar screws. Cannulated screws having diameters of 2.7 and 3.5 mm were also evaluated in the strength test as controls for comparison. The breakage of screw occurred due to fatigue. The screw provides the strength equivalent to that of a 3.5 mm cannulated screw but the bending strength of the head end portion in which the breakage occurred was assumed to be the strength of about one-third that of the intermediate portion.
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keywords = breakage
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3/4. Breakage of Knowles pins used for femoral neck fractures.

    We report the breakage of multiple Knowles pins in two patients with fractures of the femoral neck. The break occurred at the junction of the threaded and smooth sections of the pins before consolidation of the fracture.
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keywords = breakage
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4/4. Intramedullary nailing of subtrochanteric fractures: a critical review of device failure and case analysis.

    Although device failure in intramedullary (IM) nailing of subtrochanteric fractures is uncommon, breakage of the nail can occur. Following a review of the literature on this subject, a case is reported that illustrates the surgical and biomechanical factors that can lead to nail failure.
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ranking = 1
keywords = breakage
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