Comparative evaluation of pin-in-fiberglass cast and Kirschner-Ehmer external fixative in the management of radius-ulna fractures in dogs

Abstract

Four adult (two males and two females) dogs were used to comparatively evaluate the effectiveness of pin-in-fiberglass cast with Kirschner-Ehmer type I external skeletal fixative in the management of surgically created radius-ulna fractures in dogs. These dogs were assigned to two groups (A and B) with each group made up of two dogs. The radius-ulna fracture was created in all the dogs under general anaesthesia as follows: Group A, pin-in-fiberglass casting; and Group B, Kirschner-Ehmer type I external fixation. Post-operatively, minimal increase in vital parameters were observed, but were not significant (P>0.05) when compared with pre-operative values in both groups. The haematological indices were within acceptable normal limits for both group (P>0.05). Dogs in both groups bore weight on the operated limb and could walk within 24 hours post-operative. Radiographic evaluation revealed minimal soft tissue swelling and minimal periosteal tissue reaction in both groups. The Kirschner-Ehmer external fixative group attained the faster fracture healing time (7 weeks) compared to the pin-in-fiberglass group (8 weeks). Functional and cosmetic appearances were graded as excellent for both groups. Complications associated with the two techniques were cast sores in the pin-in-fiberglass group while pin loosening and serous pin tract drainage were observed in the Kirschner-Ehmer external fixative group. Thus, it was concluded that pin-in-fiberglass cast could be used as a satisfactory substitute to Kirschner-Ehmer type I external fixative in the management of simple radius-ulna fractures in dogs.

Keywords: Bone, Dog, Fracture, Kirschner-Ehmer external fixative, Pin-in-fiberglass cast, Radius-ulna