Biomechanical comparison of single-tunnel double-bundle and single-bundle reconstruction of anterior cruciate ligament

王 慶(Wang Qing，Dept Bo Joint Diseases，Guangzhou Gen Hosp Guangzhou Mil Command，Guangzhou，Guangdong 510010)…∥Chin J Clin Basic Orthop Res.－2010，2(4).－271～276

Biomechanical comparison of single-tunnel double-bundle and single-bundle reconstruction of anterior cruciate ligament

王 慶(Wang Qing，Dept Bo Joint Diseases，Guangzhou Gen Hosp Guangzhou Mil Command，Guangzhou，Guangdong 510010)…∥Chin J Clin Basic Orthop Res.－2010，2(4).－271～276

ObjectiveTo compare the difference in stability of the knee joint after single-tunnel double-bundle and single-bundle anterior cruciate ligament(ACL)reconstruction.MethodsSix formalin-soaked specimens of the human knee with retained joint capsult and surrounding ligaments underwent the single-tunnel double-dundle and single-bundle ACL reconstruction.The kinematic response of the knee joint under anterior tibial load(134 N)and rotational load(internal rotation of tibia，5 N·m)when the knee flexion was 0°，15°，30°，60°and 90°were investigated using the MTS-858 biomaterial test system.Each knee was tested sequentially under 4 conditions:intact ACL，deficient ACL，single-tunnel doublebundle ACL reconstruction as well as single-tunnel single-bundle ACL reconstruction.All ACL reconstructions utilized double quardupled hamstring tendon grafts.Results(1)Anterior tibial load condition:the anteriorposterior stability of knee joint restored when the knee was flexed at 30°，60°and 90°in double-bundle group and 90°in single-bundle group(P ＞0.05)，the anterior tibial translations in double-bundle group were smaller than those after single-bundle ACL reconstruction when knee flexion at 60°(P ＜ 0.05).(2)Rotational load condition:compared with the internal rotation degrees under the condition of intact ACL，those in double-bundle group had no statistical difference with knee flexion at 0°and 60°(P ＞0.05)，but decreased at 90°flexion(P ＜0.05);those in single-bundle group changed slightly with knee flextion at 0°(P ＞0.05).There was statistical significance between double-bundle and single-bundle group when knee flexion at 60°and 90°(P ＜ 0.05).ConclusionThe single-tunnel double-bundle ACL construction can effectively provide more anterior-posterior and rotational stability than single-bundle ACL reconstruction.12 refs，7 figs，2 tabs.

(Authors)