[Clinical studies of transpedicular system using TiNi rod with functionally optimal rigidity]

Transpedicular metal systems are very widely applied in surgical treatment of spinal pathology. Recently TiNi constructions were introduced into practice. This material is characterized by shape memory, superior elasticity and cyclic durability. Adequacy of mechanical interactions of tissues and TiNi-based alloys allows to suggest that TiNi systems are more physiological and functional in comparison with steel and titanium alloys. This enabled development of transpedicular TiNi system with good safety and stability properties in combination with physiologic compatibility and high functional value of TiNi connections. We performed computer modeling of different spine lesions treated by transpedicular systems using ANSYS program kit. Statistic and cyclic tests of transpedicular systems were made using test machine 'Terotest' according to international standards. Results of studies allowed to formulate guidelines for application of transpedicular systems with different level of rigidity in treatment of injuries and degenerative lesions of the spine. The authors performed 53 operations in patients with lesions of lower-thoracic and lumbar spine using TiNi rod with functionally optimal rigidity and obtined good postoperative results.