BACKGROUND:Anterior cruciate ligament (ACL) reconstruction is the primary treatment method for ACL rupture. Currently, studies on ACL reconstruction involve histology and embryology, anatomical structure, biomechanics, reconstruction materials, operating technology, and rehabilitation after reconstruction. However, clinical epidemiological studies describing ACL rupture and reconstruction remain scarce. OBJECTIVE:To analyze the clinical epidemiological characteristics of ACL rupture and reconstruction to provide guidance for prevention and treatment of ACL rupture. METHODS:Data of 352 patients forage, gender, cause and mechanism of injury,treatment time, and the impact of ACL rupture on menisci and articular cartilage were gathered. Meanwhile, the events during surgery, operation methods and reconstruction materials were analyzed. RESULTS AND CONCLUSION:ACL rupture mostly occurred in young men,andhappened more often to theleft knee; male patients got hurt in basketbal, footbal and accidental injuries,whilefemale patients got hurt in the accidental injuries, badminton and sking injuries, internal rotation with valgus stress accounted for the predominant injury mechanism. The ACL reconstruction wasmostlyperformedwithin1-3 months after ACL rupture, often accompanied by meniscal and articular cartilage damage. Lateral meniscus injury incidence was relatively stable, medial meniscusinjury incidence increased significantly over the half year after ACL rupture. Most articular cartilage injury occurred to patelar cartilage.Asignificant increase in medial condylar cartilage damage over 1 year after ACL rupturewas often observed. Anatomic single-bundle ACL reconstruction was the primary surgical approach, the resident ridge and the lateral bifurcate ridge could be used to position bone tunnel and autogenous semitendinosus and gracilis tendon were the most commonly used reconstructionmaterials. Our results indicate that anatomic ACL reconstruction should be performed as early as possibleinrestore knee joint stability and prevent secondary injury of the medial meniscus and cartilage of medial femoral condyle.

A case report of periprosthetic hip clostridium perfringens infection 13 years after total hip arthroplasty, the patient had hip pain with fever for one week. Physical examination and imaging examination confirmed the periprosthetic joint infection. The pathogenic bacterium was clostridium perfringens according to bacterial culture, and the pathogenic bacterium of clostridium perfringens was suspected relating to the gallbladder disease in this patient. Considering such periprosthetic joint infection was early stage hematogenous periprosthetic joint infection, treatment of debridement, retention of the prosthesis, irrigating, and indwelling drainage tube were conducted. By reviewing literature about periprosthetic clostridium perfringens infection, only seven reports of periprosthetic joint infection were caused by clostridium perfringens, which were all case reports. From the previous case reports and our case, we found that the infection around the prosthesis caused by clostridium perfringens was limited to the area around the joint, and prognosis of such cases may not be as severe as the natural gas gangrene which developed very rapidly, but great attention should be paid to. The hematogenous periprosthetic joint infection caused by clostridium perfringens who had gastrointestinal symptoms in the early stage should be highly suspicious of gallbladder lesions and thorough debridement, retention of the prosthesis, irrigating and indwelling drainage tube maybe a treatment method.