Percutaneous repair of the Achilles tendon with one knot offers equivalent results as the same procedure with two knots. A comparative prospective study.

Purpose: The present prospective comparative study included patients with acute Achilles tendon rupture (ATR) who underwent percutaneous repair with one knot compared to percutaneous repair with two knots.

Methods: All patients underwent the procedure under local anesthesia. A total of 29 patients underwent percutaneous repair with two knots (Group A), and 33 patients underwent percutaneous repair with one knot (Group B). All patients were treated by a single surgeon between 2019 and 2021 and were followed prospectively for 24 months.

Results: Patients' characteristics at baseline were similar between the two groups, except for age [38.0(15.0) vs 32.0(15.0) years, P = 0.028]. The procedure took longer for the two knots technique [19.0(4.0) vs 13.0(3.0) min, P < 0.001]. The Achilles tendon total rupture score was not different between the two techniques (90.7 ± 3.26 vs 90.5 ± 2.18, P = 0.737), as was the elongation of the gastrosoleus-Achilles tendon complex measured by the Achilles tendon resting angle [-1.0(2.0) vs - 1.0(2.0), P < 0.380]. The calf circumference of the injured and non-injured leg did not differ between the groups. Plantarflexion strength of the operated leg was significantly weaker than the non-operated leg in both groups. The European Foot and Ankle Society and patient reported outcome measures score by Piedade et al. scores were not statistically significant different between the two groups. No patient experienced a re-rupture, a venous thrombo-embolism episode, or injury to the sural nerve.

Conclusion: The modified technique offered similar objective and subjective outcome measures, in addition to reduced operative time.