- Assessing that the Achille tendon size of Vietnamese people suitable for shaping the post-knee joint posterior cruciate ligament surgery has the diameter of 9.14 ± 0.45 mm and the length of 15.3 ± 1.49 mm; specifying the method of treating the for congeners of Achilles allograft, orienting to select the diameter of the graft suitable to each specific patient group.