Absorbable lag screw was used to treat 44 cases of cross-belt injury with embryonic bone fragments. 44 cases of knee joint cross-belt injury with iliac bone fragments were treated with internal fixation. The satisfactory results were obtained. The report is as follows. 1 Clinical data 1.1 General information In this group of 44 patients, 35 males and 9 females. Age 17 to 55 years old. All were closed lesions, and 27 cases were posterior cross-belt (PCL) lesions with humeral bone fragments, 4 of which had anterior cross-belt (ACL) fracture. 17 cases were anterior cross-belt (ACL) lesions with tibial bone fragments. 10 patients had combined traumatic brain injury and 10 patients had multiple fractures. X-ray films showed that the avulsion fracture of the anterior or posterior aspect of the humerus of the knee joint was 1.0anX1.5cm~1.5cmX2.2cm. From injury to surgery time 5h ~ 20d. Average 6 1.2 knee joint examination knee joint lateral stress test positive 5 cases, front drawer test (ADT) positive 21 cases, rear drawer test (PDT) neutral position and external rotation position positive 27 cases The lower edge of the friend's nest was obviously tender in 27 cases. Treatment method: 44 cases of Finnish high molecular polymer *BIOFIX* (Baiyou) with SR 4.5nnn, length 35~5Qmn. Surgical treatment of average rice, after successful anesthesia, for PCL injury, take prone Position, the S-shaped incision on the posterior side of the knee is 8 to the middle of the tourniquet, and the posterior tibial artery can be touched. The posterior tibial artery, vein and nerve are pulled together with the surrounding tissue. The semitendinosus tendon, the semimembranosus tendon, and the medial head of the gastrocnemius are pulled inward. Cut the switch capsule, expose the fracture, remove the blood clot on the fracture section, bend the knee 20°~30* to directly reset the fracture block, drill the bone block with a diameter of 5nnn or 3.5nnn to the screw. The length is 2~3nnn, and then tapped with a tap and screwed into the corresponding absorbable lag screw. For those with ACL injury, the upper tourniquet is taken, the anterior medial incision is taken, the humerus is pulled outward, the joint cavity is exposed, the fracture block and the meniscus injury are examined, and the meniscus is repaired or removed, and then the fracture is reset. In the same way, the fracture block is fixed and the knee joint is extended and flexed. The fracture block is fixed firmly, and the damaged side band is repaired. The knee is flexed by 20°~30° postoperatively. On the 2nd day, the quadriceps of the quadriceps contracted and the flexion and extension of the ankle. 4 weeks to go to the gypsum line knee joint weight-free function exercise. After 8 to 12 weeks of fracture, the fracture can be walked with weight after clinical healing. 1.4 Treatment results The follow-up time was 6 months and 4 years, with an average of 2 years and 7 months. According to the symptoms, knee function and drawer test to assess the treatment effect. Excellent: no symptoms of knee joint, normal activity, drawer test (1) good: no symptoms of knee joint, normal activity (heavily labored, uncomfortable, slightly struggling on the stairs) drawer test (1) poor: knee joint activity Sometimes pain, limited mobility, instability, drawer test (10). In this group of patients, the bones of the tibia attachment were all healed, and 23 cases of simple patella (PCL) injury were superior. Among the 4 cases with ACL fracture, 1 case was excellent, 1 case was good, and 2 cases were poor. In 17 cases of simple (ACL) injury with tibia bone fragments, 11 cases were excellent and 6 cases were good. 2 Discussion The anterior and posterior humeral condyle is a flat cell in front of and behind the humeral intercondylar nodule. The anterior and posterior cruciate ligaments are attached to it. The main function is to limit the anterior and posterior humerus and knee extension. It can also limit the rotation and lateral movement. Mostly caused by external forces from the front of the knee when the knee flexes or stretches. After the injury, the joint is most unstable when the knee is bent at 90*, and the humerus subluxation is prone to occur. Therefore, it is helpful to diagnose by comparing the height of the bilateral humeral nodule protrusion. Combined with drawer test positive and X-ray film can be diagnosed. Once diagnosed, surgery should be performed in time. Otherwise, the cross-belt collapses and the scars in the joints proliferate, resulting in increased difficulty in surgery and poor recovery of knee joint function after surgery. If the fracture does not heal, the knee joint can be formed. Therefore, an early anatomical reduction should be made for the anterior and posterior intercondylar fractures. Because of the intersection of the cross-belts, even small bone fragments can not be ignored, so as not to cause serious dysfunction. The absorbable lag screw is a high molecular polymer. The commonly used polymers are poly(ethylene glycol) (R-PGA) and polylactide (SR-PLLA). Experiments have shown that SR-PGA and SR-PLLA have good organisms. Compatibility, non-toxic, decomposition formation is mainly hydrolysis, and its hydrolysis products are mainly water and carbon dioxide. After 3 months in the human body, the intensity gradually weakens and is completely absorbed within 1 to 2 years. The initial bending strength is 250~350Mpa, the shear strength is 170~22CMp, which is 20~30 times of the cancellous bone strength, and the elastic modulus is 8~15Gpa, which exceeds the elastic modulus of cancellous bone (~5Gpa), *BIOFIX *(百优) SR-PGA implant loses its mechanical strength at 30~60d, and the hydrophobic SR-PLLA implant loses mechanical strength in 3~12 months. The time maintained by both can meet the clinical condition of bone. The time required for healing 31. The observation results of this group show that the absorbable lag screw is used to fix the cross-belt injury with the tibial bone piece, which is stable and reliable, easy to use, no irritative reaction caused by metal corrosion, no magnetic image, postoperative Does not affect the patient's CT and MRI. Two operations can be dispensed with to reduce the chance of infection. 1. Elegant circular high-power underwater LED luminaire for underwater landscape lightings.
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