CANNULATED TELESCOPIC FEMORAL NECK SCREW DEVICE AND RELATED FIXATION METHOD

摘要

A screw assembly and method developed for the fixation of femoral neck fractures without interruption of the growth process is disclosed. The screw assembly includes a male component that is attached to the lateral cortex and a female component that is attached at the proximal epiphysis. Anchorage of the components is achieved through screw-type fixation. The screw has a built-in feature that allows for free extension of its length as the fracture site or the slipped capital physeal plate heals and normal patient growth continues. Stable fixation and rotational stability are created at the fracture (slip) site while avoiding compression forces, thus avoiding premature closure of the physeal plate.

主权项

1. A screw assembly comprising:
a female component including a hollow elongated shaft defining a medial threaded portion at one end of the hollow shaft and a lateral end opening at the opposite end thereof, wherein the lateral end opening is in communication with a non-cylindrically shaped channel formed along the hollow shaft; a male component configured to be received within the non-cylindrically shaped channel of the female component, the male component including a non-cylindrical shaped shaft defining a lateral threaded portion at one end; and a cap configured to engage the male component; wherein the non-cylindrical shaped channel of the female component defines substantially the same cross-sectional configuration as the non-cylindrical shaped shaft of the male component such that the male component is freely slidable relative to the female component along a longitudinal axis defined by the screw assembly.