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248 Victor Cotoros and Eugen Merticaru iv) displacement of the lower fractured fragment is smaller than for the first analyzed technique of osteosynthesis, so that this technique is better also, from this point of view, than the previous technique. Fig. 5 – CAD model of the assembly tibia – Kirschner broaches – metalic wire. Fig. 6 – Longitu<strong>din</strong>al section through osteosynthesis assembly.
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 249 Fig. 7 – Stress distribution for the osteosynthesis assembly bone-broaches-wire. In Fig. 7 the fracture fragments were born away, after simulation, in order to envision the stresses in broaches. Simulation performed for the virtual model tibia-two broahes-bracing wire was done for ideal condition of mechanical loa<strong>din</strong>g, namely for normal gate, with a healthy articulation, without taking into account that ankle immobilization reduces the force acting on tibia at only 30 … 40 N, in regard to value of 750 N considered for simulation. 4. CAD Model of Kirschner Broaches, Link with Bracing Wire and Cortical Screw and Finite Element Analysis of Virtual Assembly In the case of the third osteosynthesis technique, there were modeled, additionally to the previous technique, the cortical screw and the bracing wire for tieing the cortical screw with the two Kirschner broaches. The connecting screw is intended for joints with cortical bone structures and is characterized by saw shape profile with small deep and filleted bottom. The cortical screw is standardized element with the symbol M 3.5 and has the following features (dimensions): central axis diamater: 2.4 mm; spire diameter: 3.5 mm; thread length: 12 mm; total length: 20 mm; thread deep: 0.45 mm; thread pitch: 0.5 mm; head diameter: 6 mm; internal hole diameter: 3 mm.
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BULETINUL INSTITUTULUI POLITEHNIC D
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