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Torsional deformity after intramedullary nailing of femoral shaft fractures. Measurement of anteversion angles in 110 patients



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Abstract

The torsion of both femora was evaluated in 110 patients who had been treated by intramedullary nailing for unilateral femoral shaft fractures. The anteversion (AV) angle was measured by ultrasound, using a tilted-transducer technique. True torsional deformity, defined as an AV difference of 15 degrees or more between sides was found in 21 patients, but only eight had complaints related to the deformity. Three patients had reoperations for troublesome external torsional deformities. Of 26 patients with AV differences of 10 degrees to 14 degrees, defined as possible torsional deformity, three had complaints, but none had serious problems. AV differences of up to 29 degrees were observed in symptom-free patients, and no patients with AV differences below 10 degrees had complaints. Static and dynamic nailing showed almost equal tendencies to lead to torsional deformity. We conclude that torsional deformities are usually established during the operation. Many patients tolerate abnormal torsion, but efforts should be made to reduce and stabilise the femoral shaft fracture with an AV difference of less than 15 degrees.

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