Biomechanical comparison of straight and helical compression plates for fixation of transverse and oblique bone fractures: Modeling and experiments

Total deformation and stability of straight and helical compression plates were studied by means of the finite element method (FEM) and in vitro biomechanical experiments. Fixations of transverse (TF) and oblique (45°) bone (OF) fractures have been analyzed on sheep tibias by designing the straight compression (SP) and Helical Compression Plate (HP) models. The effects of axial compression, bending and torsion loads on both plating systems were analyzed in terms of total displacements. Numerical models and experimental models suggested that under compression loadings, bone fracture gap closures for both fracture types were found to be in the favor of helical plate designs. The helical plate (HP) fixations provided maximum torsional resistance compared to the (SP) fixations. The fracture gap closure and stability of helical plate fixation for transverse fractures was determined to be higher than that found for the oblique fractures. The comparison of average compression stress, bending and torsion moments showed that the FEM and experimental results are in good agreement and such designs are likely to have a positive impact in future bone fracture fixation designs

Clinical Comparison of Patients Undergoing Anterior Cruciate Ligament Reconstruction Using an Allograft or Autograft

Aim: The purpose of this study was to examine the clinical results of individuals who underwent an autograft or allograft repair of the anterior cruciate ligament (ACL). Material and Methods: Retrospective analysis was done on the patient files of patients who underwent ACL reconstruction between 2014 and 2020 using semitendinosus-gracilis tendon autografts (SGT-A) and tibialis anterior tendon allografts (TAT-A). In this study, the data of 30 patients in each group were included. Knee laxity tests, the Lysholm knee grading system, the Tegner activity score, and the International Knee Documentation Committee (IKDC) score were used to compare patient results. Results: While there was no significant difference in the Tegner activity score between the preoperative and the final measurement (p=0.241), the IKDC scores and the Lysholm knee ratings changed statistically significantly between the preoperative measurement and the last control visit (p=0.020, and p=0.038, respectively) for both groups in this study. The SGT-A group’s Lysholm knee score had a preoperative value of 60.97% and a final control value of 90.48%. The preoperative Lysholm knee score for the TAT-A group was 61.31%, and the final control value was 95.03%. The anterior drawer and Lachman test findings showed statistically significant intergroup (autograft and allograft) alterations in both the autograft and allograft groups (both p<0.001). Conclusion: In terms of knee function and laxity, this study achieved a better clinical outcome in the allograft group compared to the autograft group

Management of developmental dysplasia of the hip in less than 24 months old children

Background: There is no consensus on the treatment of developmental dysplasia of the hip in children less than 24 months of age. The aim of this study was to present the results of open reduction and concomitant primary soft-tissue intervention in patients with developmental dysplasia of the hip in children less than 24 months of age. Materials and Methods: Sixty hips of 50 patients (4 male, 46 female) with mean age of 14.62 ± 5.88 (range 5-24 months) months with a mean followup of 40.00 ± 6.22 (range 24-58 months) months were included. Twenty five right and 35 left hips (10 bilaterally involved) were operated. Open reduction was performed using the medial approach in patients aged < 20 months (with Tönnis type II-III and IV hip dysplasias) and for those aged 20-24 months with Tönnis type II and III hip dysplasias ( n = 47). However for 13 patients aged 20-24 months with Tönnis type IV hip dysplasias, anterior bikini incision was used. Results: Mean acetabular index was 41.03 ± 3.78° (range 34°-50°) in the preoperative period and 22.98 ± 3.01° (range 15°-32°) at the final visits. Mean center-edge angle at the final visits was 22.85 ± 3.35° (18°-32°). Based on Severin radiological classification, 29 (48.3%) were type I (very good), 25 (41.7%) were type II (good) and 6 (10%) were type III (fair) hips. According to the McKay clinical classification, postoperatively the hips were evaluated as excellent ( n = 42; 70%), good ( n = 14; 23.3%) and fair ( n = 4; 6.7%). Reduction of all hip dislocations was achieved. Additional pelvic osteotomies were performed in 14 (23.3%) hips for continued acetabular dysplasia and recurrent subluxation. (Salter [ n = 12]/Pemberton [ n = 2] osteotomy was performed). Avascular necrosis (AVN) developed in 7 (11.7%) hips. Conclusion: In DDH only soft-tissue procedures are not enough, because of the high rate of the secondary surgery and AVN for all cases aged less than 24 months. Bone procedures may be necessary in the walking age group with high acetabular index

Believe it or not:Kapalıçarşı is cheap if...

Taha Toros Arşivi, Dosya No: 8-Kapalıçarşıİstanbul Kalkınma Ajansı (TR10/14/YEN/0033) İstanbul Development Agency (TR10/14/YEN/0033)Yanlış kanı yıkılmalı / Disillusions must be correctedGüven sorunu var / A matter of mistrustHata rehberlerde / Guides lie about the BazaarDoğru adres Kapalıçarşı / The Bazaar is the right addressFiyatı müşteri belirler / Customers determine the pricesTicari ahlak eksildi / Ethics must be observedDolaşın, pazarlık yapın / Shop around and bargainBizden ucuz olamazlar / They can't be cheaper than usKuyumda bir numarayız / We are the best in jewelleryRehberler bizi kötülüyorlar / Guides slander usTemel prensip şeffaflık / We have to be transparentRekabet ucuzlatır / Competetion means cheapnessBüyük firmalar suçlu / Big firms and guides are lyingGerçek serbest piyasa / It's free competetion hereBiz işin özünü biliyoruz / We know the essence of this businessÇarşı pazarlık demektir / Kapalıçarşı means bargainin