Fracture to the neck of femur is frequently stabilised with a hip
screw system, however the host bone is often weak or osteoporotic.
This causes premature failure of the system, commonly by cut-out of
the lag screw through the head of the femur. While augmentation of
the fixation with bone cement improves the holding power and
decreases failure rate, current methods of administering the cement
are messy and inaccurate. This project proposes a lag screw design
which allows for direct injection of the cement, via the lag screw
itself, after the screw has been inserted and correctly positioned
in the femur. A method is also suggested to reduce the risk of
cement leakage into the joint space when the guide wire has
punctured the head of the femur. The design uses a system of holes
in the threaded section of a cannulated screw to allow delivery of
cement to the desired area. Testing was conducted in a synthetic
bone analogue as well as in cadaveric porcine femurs.
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