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Objective@#To examine the surgical method and clinical outcome of primary repair of chronic Achilles tendon rupture.@*Methods@#From March 2012 to August 2017, clinical data of 35 consecutive patients with chronic Achilles tendon rupture who were treated with primary repair by the same group of doctors at Department of Sports Medicine, Peking University Third Hospital were retrospectively analyzed.There were 29 males and 6 females with age of (41.0±9.3)years(range29-65 years). All the patients had unilateral tendon rupture with 22 cases on the left and 13 cases on the right. The preoperative and postoperative Visual Analogue Scale(VAS), American Orthopaedic Foot and Ankle Society Ankle-Hindfoot Score(AOFAS), the Victorian Institute of Sport Assessment-Achilles(VISA-A), the Achilles tendon Total Rupture Score(ATRS) and the Tegner Activity Score of patients were collected and compared by paired-t test.@*Results@#The patients were followed up for (45.6±17.2) months (range17-28 months).No serious postoperative complications such as infection or nerve damage and rerupture outcomes were reported. At the last follow-up,the VAS decreased from 1.0(2.0) (M(QR) preoperative to 0.0(0.8)(Z=-3.586, P=0.00), AOFAS increased from 64.3±12.5 to 97.0±5.0(t=-14.359, P=0.00), VISA-A increased from 51.3±9.8 to 87.8±18.0(t=-17.656, P=0.00), Tegner increased from 0.9±0.3 to 4.6±1.7(t=-12.524, P=0.00) and ATRS increased from 40.0±3.5 to 97.9±3.9(t=-64.133, P=0.00). Twenty-eight patients (80.0%) had returned to their preinjury activity levels, and 7 patients (20.0%) no longer participate in recreational sports. According to Arner-Lindholm curative effect evaluation criteria, 32 cases(91.4%) gained the excellent results, 1 case (2.9%) of good and 2 cases(5.7%) bad, and the percentage of the cases with the excellent or good results was 94.3%.All except 2 patients with bad results could perform a single-limb heel rise painlessly.@*Conclusions@#Primary repair is an efficient approach for chronic Achilles tendon rupture.The mid-and-long curative effect is satisfactory and stable. Compared with other surgical techniques, operation is relatively simple and economical.The primary repair is considerably safe, with few serious complications such as infection or nerve damage and reruptures.