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báo cáo hóa học:" The impact of tensioning device mal-positioning on strand tension during Anterior Cruciate Ligament reconstruction"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học quốc tế đề tài : The impact of tensioning device mal-positioning on strand tension during Anterior Cruciate Ligament reconstruction | Maharjan et al. Journal of Orthopaedic Surgery and Research 2011 6 33 http www.josr-online.eom content 6 1 33 JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH RESEARCH ARTICLE Open Access The impact of tensioning device mal-positioning on strand tension during Anterior Cruciate Ligament reconstruction D i I í I 2 I J . X -1 l Cl 21 I Ì u l 1- 131 r r í I_I m i1 k i D c I Z-J zl 1 t Rajesh Iviariarjan John J Costi Richard M Stanley David Martin irevor C Hearn and John R Field Abstract Background In order to confer optimal strength and stiffness to the graft in Anterior Cruciate Ligament ACL reconstruction the maintenance of equal strand tension prior to fixation is desired positioning of the tensioning device can significantly affect strand tension This study aimed to determine the effect of tensioning device mal-positioning on individual strand tension in simulated cadaveric ACL reconstructions. Methods Twenty cadaveric specimens comprising bovine tibia and tendon harvested from sheep were used to simulate ACL reconstruction with a looped four-strand tendon graft. A proprietary tensioning device was used to tension the graft during tibial component fixation with graft tension recorded using load cells. The effects of the tensioning device at extreme angles and in various locking states was evaluated. Results Strand tension varied significantly when the tensioning device was held at extreme angles p 0.001 or in locked configurations of the tensioning device p 0.046 . Tendon position also produced significant effects p 0.016 on the resultant strand tension. Conclusion An even distribution of tension among individual graft strands is obtained by maintaining the tensioning device in an unlocked state aligned with the longitudinal axis of the tibial tunnel. If the maintenance of equal strand tension during tibial fixation of grafts is important close attention must be paid to positioning of the tensioning device in order to optimize the resultant graft tension and by .