The Journal of Bone and Joint Surgery, Vol 75, Issue 4 519-525, Copyright © 1993 by Journal of Bone and Joint Surgery, Inc
The use of one compared with two distal screws in the treatment of femoral shaft fractures with interlocking intramedullary nailing. A clinical and biomechanical analysis
PD Hajek, HR Bicknell, WE Bronson, JA Albright and S Saha
Department of Orthopaedic Surgery, Louisiana State University Medical Center, Shreveport 71130-3932.
The torsional and compressive biomechanical characteristics of a system for
intramedullary fixation with a slotted locking nail and either one or two
distal locking screws were evaluated in sixteen femora obtained from eight
cadavera. No significant difference was found in the torsional rigidity or
axial load to failure when one as opposed to two distal screws had been
used. We also managed twenty-seven patients who had a fracture of the
femoral shaft with interlocking fixation, using only a single distal screw
for distal fixation. The average duration of follow-up was nine months
(range, three to twenty-five months). The average time to radiographic
healing was three months (range, two to six and one-half months). There
were no non-unions or failures of the implant. Clinically unimportant
migration of the distal screw occurred in five patients. We concluded that
one distal screw provides adequate distal fixation of fractures of the
femoral shaft treated with interlocking intramedullary nailing.