Patent ID: 7935122

Claim:
A method for performing a surgical procedure comprising: introducing an assembly into a bone structure, the assembly including a threaded cannula wherein each thread comprises an asymmetric cross-section, and a stylet positioned at least partially within an opening defined within the threaded cannula, wherein the asymmetrical cross-section comprises a leading edge having a first slope and a trailing edge having a second slope and wherein the first slope is significantly less steep than the second slope; injecting bone cement through the threaded cannula into an implantation site; determining when a depth of insertion of the threaded cannula with respect to the implantation site of the bone structure is to be adjusted; and applying a rotational motion to the threaded cannula to bite and grip the bone structure and to adjust the depth of insertion with respect to the implantation site when it is determined that the depth of insertion of the threaded cannula with respect to the implantation site is to be adjusted; wherein said threaded cannula leading edge facilitates the cannula being pushed into the bone structure during the introduction step.