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Re: nonunion of femur
послал Djoldas Kuldjanov 15 Август 2005, 02:12
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I agree that avascular necrosis and infection should be ruled out at the level of the femoral nonunion.
The treatment of this femoral nonunion seems straightforward. Straighten the bone. Prepare the canal. Place a stronger, bigger nail. Dynamize and the problem is resolved. However, this idea was previously tried three times and the patient still has a femoral nonunion.
In my opinion, there is no nail strong enough to tolerate a varus deformity of femur after nailing. The AP view of the distal femur shows that the femur has been repeatedly nailed in varus. The tip of the nail is short and lateral in distal lateral metaphysis. It should be central over the intercondylar notch and buried in the distal epiphyseal scar. This has resulted in constant bending forces on the nail (see the "windshield wiper" sign) and its eventual fatigue failure.
I would first determine the degree of varus deformity with a long standing AP x-ray. After nail removal, irrigation, debridement and reaming of the nonunion, specimens would be sent for pathology and culture. If there was any sign of infection, placement of custom made antibiotic nail e.g.
J Orthop Trauma. 2002 Nov-Dec;16(10):723-9.
for two or three weeks would be performed before an ORIF plate fixation with Judet decortications and bone graft.
My first definitive treatment choice would be a long lateral tension band plate with insertion of proximal screws directed proximally at an angle of about 25-30 degrees. Correction of the varus would be accomplished by using a tensioning device distally or compressing with two eccentrically placed distal screws simultaneously as shown in Lawrence Webb's OTA BFC lecture
or two distal screws directed distally. Fixation would be completed by a pair of locking screws each side of the nonunion..
My second choice would be an Ilizarov compression over nail if there is familiarity with both nailing and Ilizarov technique.
Djoldas Kuldjanov, MD
Department of Orthopedic Surgery
St. Louis University Medical Center
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