Temporary application of ox muzzle drainage in knee arthroscopic surgery

Background: Ox muzzle drainage is temporary a type of drainage system surrounding the anterior internal and lateral incision of knee arthroscopy. In order to make the operation visual field clear, reduce the operation time, reduce the knee pain； Methods: A total of 104 patients with meniscal associated injury who underwent knee arthroscopic meniscus between May 2014 and June 2017 were retrospectively analyzed. Temporary use during surgery Ox muzzle drainage was applied in 51 patients, while the other 53 patients were served as conventional group. The volume of irrigation fluid drained from the knee articular cavity, duration of operation, operative view clarity and occurrence of anterior knee pain.Visual clarity was evaluated with a numerical rating scale. Results: The irrigation fluid volume was significantly greater, while duration of operation was markedly shorter in the ox muzzle drainage group than the control (3200–6200ml：1700-4500ml，14-49min：22-63min，t=11.494，t=9.846，P<0.01). The operative view clarity in the ox muzzle drainage group was obviously better than the control (87.42%：66.09%，t=5.474，P<0.05). The incidence of anterior knee pain was lower than that of the control group(c 2 =11.105，P<0.01). Conclusions: Ox muzzle drainage temporary is feasible for intra-operative irrigation and stretching of the fat pad in knee arthroscopy, It is conducive to the operation of surgical instruments, shortening the operation time, reducing the injury of the subpatellar fat pad and the occurrence of anterior knee pain.