Abstract:Objective To investigate the effect of arthroscopic anterior approach combined with posterior internal approach in the precise treatment of popliteal cyst with internal drainage.Methods 114 popliteal cyst patients from October 2018 to November 2021 were selected as the research objects, and they were divided into control group and study group by random number table method, with 57 cases in each group. The study group was treated with arthroscopic anterior approach combined with posterior internal approach for cystic wall resection and internal drainage, while control group was treated with arthroscopic anterior approach combined with posterior internal approach for internal drainage of popliteal cyst. The operation status, visual analogue score (VAS) , knee function, the grade of popliteal cyst, complications rate and residual popliteal cavity in the two groups were compared.Results The operative time and duration of popliteal fossa ecchymosis in the study group were longer than those of the control group, intraoperative blood loss in the study group was more than that of the control group (P < 0.05). VAS of pain in the study group and the control group were compared before, 1 d, 3 d and 7 d after surgery, and the results showed as follows: VAS was different at different time points (P < 0.05), VAS was not different between the two groups (P > 0.05), the trend of VAS changes were different in the two groups (P < 0.05). The differences of Lysholm score and American Knee Society score (AKS) before and 6 months after operation in the study group were higher than the control group (P < 0.05). The knee motion of affected limb was compared before operation, 3 and 6 months after operation, and the results showed that: The range of motion of knee joint was different at different time points (P < 0.05), the range of motion of knee joint was different between the two groups (P < 0.05), the range of motion of knee joint in study group was bigger than control group, the trend of motion changes of knee joint was different (P < 0.05). Grade of popliteal cyst 6 months after surgery in the study group was better than control group (P < 0.05). There was no significant difference in incidence of postoperative complications (P > 0.05). The incidence of residual cyst in the study group was lower than control group (P < 0.05).Conclusion Compared with arthroscopic internal drainage alone, arthroscopic anterior approach combined with posterior internal approach for capsular wall resection and internal drainage for precise treatment of popliteal cyst can prolong operative time, but has better improvement effect on short-term knee function, knee range of motion and popliteal cyst grading, and lower cyst residual rate.