RESUMO
PURPOSE: This study was undertaken to compare the activity of beta-Ig H3 (BigH3) and transforming growth factor (TGF)-beta on chondrogenesis by mesenchymal stem cells (MSCs). MATERIALS AND METHODS: MSCs in human bone marrow aspirated from 20 healthy donors were isolated by density gradient Ficoll-hypaque separation and expanded in culture. MSC-alginate beads were prepared and incubated for 28 days in the presence of 0.5 or 10 ng/mL of TGF-beta 1, TGF-beta 1+TGF-beta 3 or BigH3. Cellular viability, total collagen and glycosaminoglycan (GAG) contents were measured and compared. SPSS version 9.0 was used for the statistical analysis. RESULTS: TGF-beta 3 significantly enhanced cell viability in beads by day 21 (p=0.029). No significant differences were found in terms of cell viability (p=0.197) or in total GAG content (p=0.253) between 10 ng/mL of TGF-beta 1+3 and 10 ng/mL of BigH3. Total collagen content was higher in the BigH3 added group on day 21 (p=0.041). CONCLUSION: The replacement of BigH3 instead of TGF-beta produced appropriate external signals indicating the chondrogenic differentiation of human bone marrow MSCs.
Assuntos
Humanos , Medula Óssea , Sobrevivência Celular , Condrogênese , Colágeno , Células-Tronco Mesenquimais , Doadores de Tecidos , Fator de Crescimento Transformador beta , Fatores de Crescimento TransformadoresRESUMO
Seidel nail is one of locked humeral nail and Seidel himself reported excellent result in his preliminary report using his nail. But our early experience showed disappointing result with high rate of complications, So we reviewed our 16 cases of humeral shaft fracture with polytrauma treated with Seidel nail and studied anatomical fitness of the nail within the distal medullary space using CT scan. The most frequent complication was intraoperative fracture of the proximal humerus and this seemed to be due to lateral placement of pilot hole. There were 3 cases of nonunion and these cases showed insufficient distal anchorage, either primarily or postoperatively. Anatomical fitness study showed insufficient spreading of nail flanges in 5 cases of distal canal width below 9mm and nonunion cases were in this group. Other problems of Seidel nail were technical difficulties due to occasionally incorrect proximal targeting device and frequent breakage of adaptor screw. Study of more cases may be needed to confirm the design problem of Seidel nail.
Assuntos
Úmero , Traumatismo Múltiplo , Tomografia Computadorizada por Raios XRESUMO
We measured normal range and mean value of the posterior laxity of normal knee which might be reference for objective and accurate diagnosis, decision of operative indication and position of knee during fixation of ligament, and role of quadriceps building in posterior cruciate ligament injury patients. These results were obtained by measurement and analysis of posterior laxity of normal knee by means of KT-2000 Knee Ligament Arthrometer. We measured 184 Korean adults (100 males, 84 females), and their average age, height, weight, and thigh circumference were 29.8 years, 165.8cm, 59.8kg, 41.2cm, respectively. At 25 degrees of knee flexion, mean posterior displacement of normal knee was 21.2mm with 15lb posterior tibial loading, 2.41mm with 20lb posterior tibial loading. And when quadriceps were tense, laxity was 0.79mm and 0.95mm at the same degree of knee flexion. At 75 degrees of knee flexion, the results were 0.57mm, 0.58mm, 0.26mm, and 0.28mm respectively. Right to left difference of posterior displacement with 20lb posterior tibial loading was 0.07mm at 25 degrees of knee flexion and 0.06mm at 75 degrees of knee flexion. We thought that above 75 degrees of knee flexion is suitable for knee position at the time of graft fixation because 75 degrees of knee flexion markedly decreased(75%) posterior displacement compare to 25 degrees of knee flexion. When quadriceps were tense, remarkable decrease of posterior laxity of normal knee was checked(58%), so we noticed quadriceps building is important to management of posterior cruciate ligament injury patients.