TREATMENT OF FEMORAL SHAFT FRACTURES IN CHILDREN BY CLOSED REDUCTION AND EXTERNAL FIXATION

This is a prospective study performed from December 2005 to November 2007 on 25 children with closed traumatic femoral shaft fractures admitted to the orthopedic department of Sulemani Teaching and Causality Hospital. Their ages ranged from 3 to 13 years with male to female ratio of 17:8. All cases were treated by gentle fracture reduction and application of monolateral external fixation by the closed method. The average time needed for the fracture to unite was 72.6 days (ranged from 45 – 121 days). The complications reported in the study were: 12 % pin tract infection, 8% of temporary knee joint stiffness and 4% of heterotopic ossification at the site of pin insertion. Neither bone refracture or clinical shortening of the injured limb were reported. The study concluded that unilateral external fixation is a good method of holding femoral shaft fractures in children. The treatment is associated with minimum morbidity and will result in satisfactory bony union, low rates of complications, and early return to school. Introduction emoral shaft fractures are the most common major injury treated by pediatric orthopedists. These fractures typically occur either in early childhood, when weak woven bone is changing to the stronger lamellar bone, or during adolescence, when children (4 to 15 years) are subjected to high-energy trauma from sports and motor vehicle accidents. Child abuse must be considered, especially in infants 1 . Pathological fractures are common in generalized disorders such as spina bifida and osteogenesis imperfecta and local lesion e.g. a benign cyst or tumors 2 . The Winquist and Hansen (1984) classifications system 3 for femoral shaft fractures is based on the diameter of bone that is comminuted .It consists of 4 types. Type I and II fractures are axially stable, whereas type Ill and IV fractures are both axially and rotationally unstable. Patients with femoral shaft fracture are unable to walk and are in extreme pain with an obvious swelling of the thigh. Physical examinations are sufficient for documentation of the presence of fractures. Swelling, instability, crepitus and tenderness are usually present 4 . The diagnosis is more difficult in patient with multiple trauma or head injury and in non-ambulatory, and severely disabled children. Anteroposterior (AP) and lateral views are usually adequate in demonstrating the fracture. Stress fractures of the femoral shaft may not be visualized on these routine views. Hip and knee joints should be included in Xray taken as there is a significant incidence of associated injury 5 . Treatment of femoral shaft fracture is age dependent with considerable overlap between age groups 6 . Other important factors to consider in the treatment are family concerns and whether the fracture is complicated or uncomplicated (table I). F Treatment of femoral shaft fractures in children Omer A. Rafiq Barawi & Saman Hama Khursheed Sharef Bas J Surg, March, 18, 2012 57 Table I: Treatment options according to the patient age 6. The most common complication after femoral shaft fractures in children is limb length discrepancy, usually resulting from "overgrowth" of the injured femur. Although some angular deformity occurs after femoral shaft fractures in children, it usually remodels with growth. The acceptable amount of angular deformity is controversial, but as a general guideline, angulation of more than 15 degrees in the coronal plane or lateral and 20 degrees in the sagittal plane or anteroposterior is unacceptable. Delayed union and nonunion of femoral shaft fractures are rare in children and occur most often after open fractures 7 . Patients and methods A prospective study was carried out at the Department of Orthopedics and Traumatology of the Sulemani teaching and casualty Hospitals during the period from Dec. 2005 to Nov. 2007. A total number of 25 children with 25 closed fractures shaft femur were evaluated and surgically treated by closed external fixation. Their ages ranged from 3 to 13 years (Fig. 1). There were 17 boys and 8 girls. Figure 1: Age distribution in years. Operative technique The operation was performed under general anesthesia on an ordinary operation table without the use of fluoroscopy. Preparation of the skin over entire lower limb with usual antiseptic solution (aqueous povidone-iodine) and draping were done. Sustained manual traction was first applied to the injured limb to restore its normal length followed by closed manipulation of the fracture and application of monolateral external fixation. The external fixator device used in the study was of the Orthofix type (made in USA) figure 2. Treatment of femoral shaft fractures in children Omer A. Rafiq Barawi & Saman Hama Khursheed Sharef Bas J Surg, March, 18, 2012 58 Figure 2: External fixator apparatus: A: Jacob chuck, B: T-shaped handle, C: Schantz pins, D: Clamps, E: Bar or Tube, F: Allen key. A total number of four Schantz pins were used in every patient. For better control and reproducibility, we prefer hand insertion of the pins as opposed to selfdrilling pins inserted with a motorized power unit. First pin was inserted proximally at approximately the level of lesser trochanter, the second pin was inserted distally into lower femoral metaphysis several centimeters away from the epiphyseal plate .Two more Schantz pins were placed both proximal and distal to fracture site. These pins should be placed perpendicular to the anatomic axis of each segment of the fractured femur. Then they were fastened with one parallel lateral bar. Stability of fracture reduction and fixation and the ability to obtain passive knee flexion greater than 90° was tested in every patient following completion of Surgery (Fig.3). Figure 3: Clinical testing while the patient is still anesthetized. a: The external fixation in situ, limb alignment is checked. b: testing passive knee flexion. c: Checking length of the injured limb. Post operative treatment From the first postoperative day, isometric exercises of the thigh and active movements of the ankle were encouraged together with gentle passive movement of the patella by the child's mother. A daily pin insertion site cleaning and dressing was started. The patient is encouraged to stand on the sound site but without weight bearing on the fractured limb. The main hospital stay was 1.5 days and it ranged from 1-3 days. Follow-up visits were arranged to evaluate the progress of the fracture healing and to monitor the patient and the limb for possible complications. The first follow-up visit was arranged two weeks post operatively and then at a monthly interval till there is union of the fracture. Special emphasis was on monitoring of limb alignment, limb length discrepancy (up to 1.5 cm shortening was accepted), pin sites for pin track infection, thigh Treatment of femoral shaft fractures in children Omer A. Rafiq Barawi & Saman Hama Khursheed Sharef Bas J Surg, March, 18, 2012 59 muscles power and range of hip and knee movements. Radiological monitoring for fracture union and callus formation was performed at each visit. (see Figure 4). Figure 4: Radiographic monitoring of the same patient. a: Initial radiograph. b: 2 weeks postoperative showing early signs of union. c to e after removal of the external fixation at 6,10 and 12 weeks (postoperatively) showed progression to complete bony union. Partial weight bearing was allowed 3-5 days postoperatively and full weight bearing after 2 weeks. The time period of holding the fracture by the external fixator had ranged from 45-121 days and the average was 72.6 days. Follow-up was continued after removal of the device with the first visit being after two weeks and a second last visit at 6 months. Limb length, alignment of the injured limb and range of active and passive movements of hip and knee joints of the involved limb are checked in the follow up visits (fig.5). Figure 5: Clinical evaluation of the same patient after removal of the external