روش تغيير يافته كارگذاري بخش استخواني گرافت در بازسازي رباط متقاطع پشتي زانو با پيچ اينترفرانس (مطالعه بيومكانيك بر روي مدل حيواني استخان گاو)

Modification of Tibial Inlay Fixation In Posterior Cruclate Ligament Reconstruction by Interference Screw

Backgrouud: This stu dy presents a modification oftibial inla y technique in post erior cruciare Iige ment (peL) reconstruction and evaluates the structural properties oftibi al side fixation ofthe graft, comparing tibial inlay technique and a new modification, that is interference screw fixation of tibial side of the graft in suggested supine position which is more applicable, with less potential intraoperative neurovascular complications. Methods: Forty fresh calfknees that were prepared from 20 healthy 3 years old calves which were between 200 and 220 kg were the subject of this study. The tib ias were separately nsed simulating tibial side PeL reeo nstruction with tibial tuberositypatellar tendon-patellar bone g raft. Tibial side oft he g raft wa s fixed using two cancell ODS screws in 20 ti biae and w ith interference screw in obliquely oriented canal in another 20 tibiae. Load-to-failure test was carried out on ten samples from each group. Theremaining samples were used for cycling loading. Structural properties ofeach group were compared. Results: No significant differences were observed between two methods at load-to- failure test; but mean elongation at 1,000 cycles of new modification was significantly lower thantibial inlay technique. Cenefuslon: In this biomechanical experimental study there found no significant differences between two methods at load-tofailure tests. Maximum load (N) was different between the tibial inlay method and the modified method but the difference was not statistically significant. Yield load and linear stiffness and deformation at the yield point were also not different between the two methods. The only important difference between the two methods was at cy clic loading test where the mean elongation at 1.000 cycles of the modified technique group was significantly lower than tibial inlay technique IJr= 0.01).