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The most important feature of the Cannulated Screws is that it has no nut and the distal pitch is greater than the proximal pitch.
Therefore,with each rotation of the screw,the distance of the orthopedic bone screw in the distal bone segment is greater than that in the proximal bone segment, resulting in pressure effect.After fixation with conventional hollow screws,the nut is exposed outside the calcaneus, resulting in mobility impairment and pain,ultimately requiring screw removal.In order to retain the stability of screw fixation and overcome the disadvantages of traditional Orthopedic Screw,Herbert et al.developed a cannulated counterbore screw to solve the corresponding problems caused by the nut being exposed to the outside of bone,namely Herbert screw.
According to comparative clinical studies,Herbert screw percutaneous internal fixation provides higher fixation strength and stability,better fatigue resistance,and better fracture reduction during full weight-bearing.The mechanical test of yield strength also showed that the fixation strength of the Herbert cannulated screw was stronger than that of the conventional hollow screw.The failure of the instrument showed that the Herbert screw was more in line with the biomechanical characteristics of the foot,so that more stress was transmitted to the bone and the degree of stress destruction was reduced.Herbert screw orthopedic percutaneous internal fixation of calcaneal fractures has good stability, high fixation strength,can well maintain the fracture alignment,load the mechanical structure of the foot,and is more suitable for early functional exercise and weight-bearing.It has strong clinical application value.
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Main Product:
Orthopedic Implant ,
Orthopedic Instrument,
Locking Plate,
Orthopedic Power Tools,
Trauma Implant,
External Fixator
