ObjectiveTo investigate the short-term effectiveness of arthroscopic single bundle four-strand reconstruction using autologous semitendinosus tendon and anterior half of peroneus longus tendon for posterior cruciate ligament (PCL) injuries.MethodsA clinical data of 30 patients with PCL injury, who were admitted between December 2015 and September 2018 and met the selection criteria, was retrospectively analyzed. All patients were treated with arthroscopic single bundle four-strand reconstruction using autologous semitendinosus tendon and anterior half of peroneus longus tendon and TightRope technique. Among them, 19 were male and 11 were female, aged 17-48 years (mean, 28.2 years). The PCL injury was caused by traffic accident in 8 cases, sport in 14 cases, falling and bruising by a heavy objective in 5 cases, and other injuries in 3 cases. The interval between injury and operation was 10-90 days (mean, 39.3 days). The PCL injury was rated as grade Ⅱ in 6 cases and grade Ⅲ in 24 cases. The posterior drawer test was positive in 26 cases and the inverse Lachman test was positive in 24 cases. The International Knee Documentation Committee (IKDC) score was 61.37±8.49, and the objective IKDC ligament grading was near normal in 2 cases, abnormal in 8 cases, and significantly abnormal in 20 cases. The modified Lysholm knee score was 62.20±5.67. The knee range of motion (ROM) was (101.83±8.15) °.ResultsThe operative time ranged from 70 to 110 minutes (mean, 79.7 minutes). All incisions healed by first intetion. All patients were followed up 12-24 months (mean, 19.0 months). There were 3 cases of deep vein thrombosis in the lower extremity after operation, and 1 case of approximately 10° limitation of knee extension. At last follow-up, the posterior drawer test was positive in 2 cases and the inverse Lachman test was positive in 1 case, with significant differences compared with the preoperative period (χ2=38.571, P=0.000; χ2=36.274, P=0.000). The IKDC score was 84.67±3.67, and the objective IKDC ligament grading was normal in 16 cases, nearly normal in 10 cases, abnormal in 3 cases, and significantly abnormal in 1 case; the modified Lysholm knee score was 90.37±4.49; all of the above indexes were significantly better than preoperative ones, and the differences were significant (t=−12.387, P=0.000; Z=−2.810, P=0.005; t=−22.865, P=0.000). Knee ROM was (88.33±9.86)° at 1 month after operation and reached (113.33±13.48)° at last follow-up, showing significant differences between pre- and post-operation (P<0.05). MRI re-examination showed that the form and position of reconstructed PCL were satisfactory.ConclusionIt can obtain good short-term effectiveness for PCL injuries by arthroscopic single bundle four-strand reconstruction using autologous semitendinosus tendon and anterior half of peroneus longus tendon, which has the advantages of reliable surgical approach, safe operation, and precise effectiveness.