Objective To explore clinical results of arthroscopically assisted treatment for tibial plateau fractures.Methods Thirty-eight cases of tibial plateau fractures were treated under arthoscope.According to the Schatzker classification,there were 8 cases of type Ⅰ, 10 cases of type Ⅱ,11 cases of type Ⅲ,4 cases of type Ⅳ,3 cases of type Ⅴ,and 2 cases of type Ⅵ,respectively.Routine arthoscopic examination of the knee found 15 cases of meniscus injury,12 cases of partial or complete rupture of anterior cruciate ligament(ACL),and 7 cases of medial collateral ligament (MCL) injury.Fracture reduction and fixation was performed under arthroscopic surveillance.The tibia plateau fracture was fixed with the cancellous bone screws(Schatzker Ⅰ~Ⅲ) or minimally invasive plate osteosynthesis(Schatzker Ⅳ~Ⅵ).Results The operation time was 30~72 min(mean,40 min) and the intraoperative blood loss was less than 20 ml.A follow-up was carried out in 36 cases for 4~36 months(mean,15 months).The X-ray findings at the 3 postoperative month showed bone union in all the 36 cases.There were no wound or joint infection,skin necrosis,or delayed union.The Hospital for Special Surgery(HSS) knee scores 3 months after operation revealed excellent results in 28 cases,good in 6 cases,and fair in 2.The main untoward manifestations at this period were lacking of muscle force and limited extension and incurvation of the knee joint.The HSS scores 6 months after operation showed excellent result in 33 cases and good in 3 cases. Conclusions Arthroscopically assisted treatment of tibial plateau fractures has advantages of accurate reduction and fixation and early detection and management of associated intraarticular injuries.Different methods of internal fixation should be chosen according to different types of facture.

Objective:To study the effects and mechanisms of acetyl-11-keto-β-boswellic acid ( AKBA) in myocardial ischemic model induced by isoproterenol hydrochloride ( ISO) in rats. Methods:The SD rats were randomly divided into the sham group, model group, AKBA low dose group and AKBA high dose group. Myocardial injury model was induced by subcutaneous injection of ISO (100 mg·kg-1 ) . The change of ST segment in ECG was observed. Creatine kinase ( CK-MB) , cardiac troponin I ( cTnI) , lactate dehydro-genase( LDH) , malondialdehyde( MDA) and superoxide dismutase( SOD) in the blood were detected by ELISA. The change of histo-logical tissue was determined by HE staining, and cell apoptosis was analyzed by TUNEL assay. Results: Serum CK-MB, cTnI and LDH were decreased significantly in AKBA high dose group when compared with those in the model group. Compared with that in the model group, MDA content was lowered and the SOD activity was increased in AKBA high dose group. Furthermore, AKBA high dose group improved the pathologic changes of myocardium. TUNEL assay revealed significant reduction of cardiomyocytes apoptosis in the hearts of the ischemic rats in AKBA high dose group. Conclusion:AKBA has excellent cardioprotective effect on myocardial ischemic induced by ISO and protection of myocardial cells from injury.