髋关节置换ppt

1、These images demonstrate a distal femoral shaft fracture occurring from blunt trauma.,Before performing antegrade femoral nailing, a high-quality AP radiograph of the hip is necessary to rule out occult femoral neck fracture.,Many patients with femoral shaft injuries have CT scans performed to rule

2、out intraabdominal injury. The CT scan cuts through the femoral neck should also be reviewed to rule out fracture.,Lateral decubitus position is preferred for antegrade femoral nailing in the patient with normal pulmonary status and no spine or pelvic injury. The affected leg is flexed, exposing the

3、 piriformis fossa without steric interference from the patients torso.,The downside leg is well supported and padded to avoid neuropraxia. The surgeon is pointing to the starting point for the piriformis entry point.,View of the area that is prepped out for performing the nailing.,PIRIFORMIS FOSSA,T

4、he piriformis fossa entry portal is directly in line with the canal of the shaft. However, it is slightly posterior to the femoral neck. It is curvilinear and angled posteriorly.,Because the piriformis entry portal is on a sloped surface, a straight awl must be introduced first at an angle to the fe

5、moral shaft directly anteriorly,1,2,and then as its introduced, the hand is raised up to go in line with the femoral shaft.,1cm,The skin incision, which can be approximately 1 to 1-1/2cm in length, should be made at a distance away from the piriformis fossa to allow for direct entry into the fossa.

6、This can be best estimated by looking,1cm,at the AP radiograph to determine how proximal the incision needs to be with respect to the trochanter. The heavier the patient, the more proximal in the buttocks the incision needs to be in order to be in line with the femoral shaft.,The fascia of the Tenso

7、r fascia Lata muscle is divided, exposing some of the musculature.,The perfect lateral radiograph of the hip demonstrates the neck to be colinear with the shaft and slightly anterior to it. The piriformis fossa is easier visualized.,The straight awl is introduced through the incision, then gently pl

8、aced against the piriformis fossa directed anteriorly.,The awl is introduced into the femoral canal; as it enters the bone, the awl is adjusted to be in line with the femoral shaft by moving the hand and awl anteriorly.,The awl is introduced into the femoral canal; as it enters the bone, the awl is

9、adjusted to be in line with the femoral shaft by moving the hand and awl anteriorly.,Once the awl has been introduced gently, it is tapped down past the calcar to allow for easy passage of the guidewire.,Once the awl has been introduced gently, it is tapped down past the calcar to allow for easy pas

10、sage of the guidewire.,The guidewire should have a gentle distal bend to allow easy passage across the fracture site. The guidewire is introduced down the femoral shaft.,A soft tissue protector can be used to minimize muscle injury proximally.,The guidewire is advanced down the canal. Note the colin

11、earity of the entry point with the center of the shaft.,The guidewire is introduced to the level of the fracture.,The fracture is reduced and the guidewire is passed across and distally until it is just shy of the epiphyseal scar in the center of the femur on the AP radiograph. This is particularly

12、important for distal fractures.,Once the guidewire is fully introduced, length may be measured in many ways. While some systems have jigs to measure length, a foolproof system is to measure a residual of a guidewire of the same length.,The above image demonstrates a second guidewire of the same leng

13、th introduced to the level of the trochanter.,A Kocher clamp is placed on the guidewire so that the residual can be directly measured.,Measuring the residual from this guidewire will give an exact measurement of the longest nail that is possible for this patient. After measurement is obtained, the f

14、emoral canal is reamed.,The reamer introduced through the stab incision and the soft-tissue protector used to protect the musculature.,After reaming is complete, the appropriate size nail is chosen. Before the nail is inserted, as with any nailing procedure, the proximal jig needs to be checked for

15、appropriate alignment of the locking mechanism.,An exchange tube is placed over the ball-tip guidewire, which is then removed. A straight guidewire is then placed through the exchange tube, which is then removed,allowing for placement of the nail over the straight guidewire.,The nail is gently tappe

16、d down the canal. Any significant resistance warrants biplanar radiographic confirmation of appropriate position of both the guidewire and the nail, as well as areas of the femoral neck for possible fracture.,After the nail is appropriately seated, with the jig at the level of the greater trochanter, the proximal jig is used to lock the nail. Distal locking is generally performed using a freehand technique via perfect circles.,The above image demonstrates the C-arm in a position to view a perfect circle.,T