Intramedullary compression osteosynthesis

The biomechanical principle of intramedullary compression osteosynthesis is based on the implantation of a movable intramedullary nail that is statica lly interlocked in distal round holes and dynamically interlocked in a prox imal slot. Distraction of the nail against the proximal interlocking screw by means of a compression screw leads to a relative movement of the proxima l fragment directed distally against the nail. This results in direct conta ct of the main fragments under increasing compression. Simple fractures, pseudarthroses and osteotomies within the diaphyses of th e long bones represent promising indications for the use of compression nai ling. Furthermore, this method enables extraordinarily stable knee and ankl e arthrodeses. Major positive aspects are controlled adaptation of fragment s and a significantly increased stability of the fracture as compared to co nventional intramedullary nailing techniques, especially as rotational forc es are concerned. The biomechanical advantages result in earlier full weightbearing and an in creased rate of fracture union in delayed healing. Given the use of optimiz ed implants and instruments, compression intramedullary osteosynthesis offe rs a remarkable potential for further improvement in both the spectrum and success of intramedullary nailing.