髌骨骨折（英文版）课件

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,*,It is important to fully evaluate patella fractures on the AP x-ray as well as,the lateral x-ray.The AP x-ray demonstrates the number of fragments and,vertical splits in the sagittal plane that are not visible on the lateral x-ray.,It is important to fully evaluate patella fractures on the AP x-ray as well as,the lateral x-ray.The AP x-ray demonstrates the number of fragments and,vertical splits in the sagittal plane that are not visible on the lateral x-ray.,Lateral radiograph demonstrating complete separation of,the patella with loss of extensor mechanism.,A vertical midline incision is performed over the patella.,After coming through subcutaneous tissue,the patella,fracture is immediately evident.The clot and cancellous,bone edges are cleaned.,A lamina spreader demonstrates the fracture site.,PATELLA ARTICULAR,SURFACE,TROCHLEAR,GROOVE,PROXIMAL,DISTAL,The articular surface of the patella and trochlear groove are,evident upon flexion of the knee.,RETINACULAR TEAR,With displaced patella fractures there are concomitant,retinacular tears medially and laterally.,PATELLA ARTICULAR,SURFACE,TROCHLEA,After complete debridement and cleaning of the fractures,a,cannulated screw guidewire can be placed retrograde through,the fracture site,close and parallel to the articular surface.,The drill is then used also in a retrograde fashion.,The saggital plane split is seen when the distal fragment is flexed.,This fracture is fixed with a transverse lag screw that will not,interfere with the cannulated screws.,Using a clamp,the fracture is reduced.,FRACTURE,REDUCTION,Using a clamp,the fracture is reduced.,A second clamp is necessary in this,case to maintain the reduction.,Closeup of the complete reduction,using several clamps.,After the reduction is complete,the K-wires are visualized in the,lateral and AP planes,which are used to evaluate not only the,guidewire placement but also the reduction.,Lateral and AP views.Notice that the lag screw is placed,between the inferior lateral and inferior central fragment,but does not extend into the fragment on the medial side,as,this would interfere with the placement of the K-wire.,The two cannulated screws are placed over the guidewires.These,screws must be large enough to enable the tension band to be placed,through them.,Each manufacturer is different;the surgeon must be confident that,the cannulation of the screw will accommodate the cable or wire system.,The screw should be placed such that it is short of the end of the,bone.This is to avoid the cable or wire system from being injured,by the sharp threaded end of the screw.,The cable system is introduced through one screw looped around,anteriorly,then placed in the same direction through the second,screw.,The two ends are pulled through a connector and underneath,the clamp,which remains in place during the tightening.,In this case the Dahl-Miles system is used and the tightener,is connected to the two free ends after a fastener is attached.,Lateral X-Ray,AP x-ray demonstrating the tightening,of the cable grip system.,After the wire is sufficiently tightened and crimped,in place,it is trimmed very close to the sleeve.,The retinaculum is then carefully repaired on both the,medial and lateral sides to afford stability and additional,support to the reconstruction.,Closeup of the final reconstruction.,Lateral radiograph demonstrating the reduction.Notice that the,screw tips are shy of the cartilage on the patella.The cable grip,system wraps around the bone and is not making a sharp angle,at the tip of the screw.,AP x-ray demonstrating the reconstruction using the cannulated,screws to fix the central distal fragment and the medial distal fragment,back to the proximal fragment.The distal lateral fragment is held with,a lag screw.After fixation,the knee is brought to a complete range of,motion to confirm stability and repeat radiographs are obtained.,