Niloofar Namazi, MD; Fereydoon Mojtahed Jaberi, MD; Sara Pakbaz, MD; Amir-Reza Vosooghi, MD; Mehrad Mojtahed Jaberi, MD
Abstract
Background: Destruction of pain receptors around patella by electrocauterization is commonly used during total knee arthroplasty. Its effect on cartilage was the goal of this survey.Methods: In a clinical trail study, 20 rabbits, divided into two equality sized groups (experimental-control) and experimental ...
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Background: Destruction of pain receptors around patella by electrocauterization is commonly used during total knee arthroplasty. Its effect on cartilage was the goal of this survey.Methods: In a clinical trail study, 20 rabbits, divided into two equality sized groups (experimental-control) and experimental group underwent surgery via medial parapatellar arthrotomy of the knee joint. Electrocauterization denervation at a depth of 1 mm and a distance of 3 mm from border of patella performed in the cases animals. No patellar denervation was done in the control group. Range of motion of joint, macroscopic evaluation using modified outerbridge score, and histopathologic scoring were assessed after twelve weeks. Results: Finally, nine cases and eight control animals were included due to death of three animals. Full range of motion was seen in all rabbits. Statistically significant difference in outerbridge score (p < /em>=.002), cellularity (p < /em>=.016), loss of matrix (p < /em>=.004), and clustering of chondrocytes (p < /em>=.008) were obtained.Conclusions: Cartilage destruction may be the result of electrocauterization of patellar rim. So, routine electrocauterization should be discouraged.
Fereidoon Mojtahed Jaberi, MD; Hooman Abbasi, MD; Nasrin Saki; Amir Lotfazar; Ahmad Ensafdaran, MD; Soraya Saki; Mehrad Mojtahed Jaberi
Abstract
Background: This study presents a modification of tibial inlay technique in posterior cruciate ligament (PCL) reconstruction and evaluates the structural properties of tibial side fixation of the graft, comparing tibial inlay technique and a new modification, that is interference screw fixation of tibial ...
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Background: This study presents a modification of tibial inlay technique in posterior cruciate ligament (PCL) reconstruction and evaluates the structural properties of tibial side fixation of the 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 calf knees that were prepared from 20 healthy 3 years old calves which were between 200 and 220 kg were the subject of this study. The tibias were separately used simulating tibial side PCL reconstruction with tibial tuberosity-patellar tendon–patellar bone graft. Tibial side of the graft was fixed using two cancellous screws in 20 tibiae and with interference screw in obliquely oriented canal in another 20 tibiae. Load-to-failure test was carried out on ten samples from each group. The remaining samples were used for cycling loading. Structural properties of each 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 than tibial inlay technique.Conclusion: In this biomechanical experimental study there found no significant differences between two methods at load-to-failure 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 cyclic loading test where the mean elongation at 1,000 cycles of the modified technique group was significantly lower than tibial inlay technique (p < /em>= .01).
