[The clinical efficacy of arthroscopic combined with dual-plane high tibial osteotomy in the treatment of anterior cruciate ligament injury combined with varus deformity of knee joint].

To explore the short-term effectiveness of arthroscopic combined with dual-plane high tibial osteotomy in the treatment of anterior cruciate ligament injury combined with varus deformity of knee joint. A retrospective study was performed on 17 patients with anterior cruciate ligament injury combined with varus deformity of knee joint who underwent arthroscopic combined with dual-plane high tibial osteotomy at Department of Bone and Joint, the Affiliated Hospital of Southwest Medical University from January 2017 to June 2018.There were 11 males (11 knees) and 6 females (6 knees), aged 41.3 years (range: 32 to 49 years) .During the surgery, the weight bearing line of lower extremity was set to 62.5% position of the tibial plateau on coronal plane. The tibial slope was adjusted to the normal range on sagittal plane, and anterior cruciate ligament was reconstructed to improve the stability of knee joint.At final follow up, full length weight bearing X ray was used to evaluate the position of weight bearing line, femoral tibial angle and tibial slope pre- and post-operatively.The Lysholm scores, Hospital for Special Surgery score, Tegner knee activity scores and International Knee Documentation Committee (IKDC) scores were used to estimate knee joint function, while the Lachman test, KT-1000 side-to-side difference and pivot-shift test were used to estimate the knee joint stability. The patients were followed up for 1.8 years(range:1.2 to 2.5 years). No complication such as infection, deep vein thrombosis, graft failure, nonunion or delayed union was observed.The weight bearing line was corrected from (28.48±2.24)% preoperatively to (57.43±1.02)% postoperatively (46.80, 0.00) .The femoral tibial angle was improved from (172.31±3.37) ° preoperatively to (178.91±1.34) ° postoperatively(10.46, 0.00). The tibial slope was decreased from (14.29±1.26) ° preoperatively to (9.31±0.79) ° postoperatively (24.59, 0.00) . The KT-1000 side-to-side difference decreased from (7.95±1.19) mm preoperatively to (1.79±0.49)mm postoperatively(18.34, 0.00). At the last follow-up, Lysholm score, Hospital for Special Surgery score, Tegner score, and the IKDC knee evaluation score of patients showed significant improvement from preoperative(0.05). Arthroscopic combined with dual-plane high tibial osteotomy can get a good short term efficacy in the treatment of anterior cruciate ligament injury combined with varus deformity of knee joint which can significantly improve the alignment of lower extremity and knee joint stability.