Abstract
This case series describes the clinical results following stabilization of comminuted
diaphyseal femoral fractures, two of which extended into the proximal metaphyseal
region, using an articulated intramedullary (IM) pin-hybridized circular external
fixator construct in three cats. An IM pin was placed to initially align and stabilize
each fracture via an open reduction. The fixator construct consisted of a proximal
partial ring arch and a distal stretch ring. Half-pins were used as fixation elements
on the proximal ring, whereas olive wires were used as fixation elements on the distal
ring. All three fractures were acceptably reduced and aligned. The constructs afforded
functional use of the limb during the post-operative convalescent period with few
complications. The constructs were maintained for 8, 15, and 16 weeks until there
was sufficient radiographic fracture healing for fixator removal. In one cat, the
IM pin was maintained following fixator removal and was articulated with a single
retained half-pin engaging the greater trochanter and femoral neck. All three cats
were reported to have acceptable pelvic limb function at 12, 25, and 93 months following
surgery, with two of the cats reported to have occasional, intermittent nominal lameness.
Keywords circular external skeletal fixator - cats - comminuted diaphyseal femur fracture -
hybridized
