No abstract

No abstract

Proximal tibiofibular synostosis without multiple hereditary exostosis is extremely rare and only 7 cases have been reported in the literature. All of the previously reported cases accompanied deformities such as distal positioning of the proximal tibiofibular joint, leg length discrepancy, bowing of the fibula, and valgus deformity of the knee. The present case of a 24-year-old man had neither a history of trauma nor deformity around the knee. Therefore, it was suggested that this type of synostosis occurred after epiphyseal plate closure.Résumé Une synostose tibio-fibulaire proximale sans une maladie exostosante héréditaire multiple est extréme-ment rare et seulement sept cas ont été mentionnés dans la bibliographie. Tous les cas précédemment rapportés s'accompagnaient de déformations telles qu'un positionnement distal de l'articulation tibio-fibulaire proximale, une anomalie dans la longueur de la jambe, une courbure de la fibula avec une distance interosseuse augmentée, et/ou une déformation en valgus du genou. Le cas présent concerne un homme âgé de 24 ans ne présentant pas l'antécédent d'un trauma ni d'un déformation du genou. Par conséquent, il est suggéré que ce type de synostose s'est produit aprés une obturation de la plaque épiphysaire.

No abstract

The objective of this study was to develop a non-destructive method for monitoring fracture healing with acoustic emission (AE). Experimentally produced fractures of the rat femur were tested in tension and in torsion at 4,6,8 and 12 weeks after fracture. AE signals were monitored during these mechanical tests. The values for load and torque at the initiation of the AE signal were defined as new mechanical parameters. The apparent density and ash density of the fracture site were also measured at each time period. Tensile strength, tensile stiffness, maximum torque and torsional stiffness of the fracture site increased with time. The AE signal was detected before complete specimen failure. Load and torque for initiation of AE increased proportionally with increasing mechanical properties. The mineral density, however, reached a plateau at 8 weeks, when callus mechanical strength was approximately 50% of control. Load for initiation of AE was strongly correlated with the strength (I = 0.98), stiffness (I = 0.88). and failure strain ( Y = -0.63) of the callus. Torque for initiation of AE was highly correlated with the maximum torque (I = 0.95) and torsional stiffness (I = 0.93) of the callus. The findings of the present study indicated that some mechanical properties of healing fractures could be estimated by monitoring AE signals.