Axial Correction of Pes Varus by Transverse-Opening Wedge Osteotomy and T-Plate Fixation with Beta-Tricalcium Phosphate (.BETA.-TCP) Transplantation in Dachshunds

Abstract

ABSTRACT. Axial correction was performed surgically in two miniature dachshunds presenting with lateral patellar dislocation and limping caused by pes varus. Pes varus had resulted from asymmetric closure of the physis of the distal tibia. Prior to surgery, osteotomy was simulated by measuring X-ray films to determine the distance required for the wedge opening. Transverse-opening wedge osteotomy was performed on the medial side of the distal tibia, and beta-tricalcium phosphate (β-TCP) was inserted in a wedge shape into the area created by the cuneiform osteotomy. Finally, the tibia was fixed by a veterinary 1.5/2.0-mm T-plate. Both dogs were able to walk a few days after surgery, and the lateral dislocation of the patella normalized almost completely in about one month. At two months, Xray films showed that the implant had remained in position without any dislocation, and the β-TCP had fused with the surrounding bone.KEY WORDS: opening wedge osteotomy, pes varus, T-plate fixation.

Use of hinged circular fixator constructs for the correction of crural deformities in three dogs

“…Hinged circular external skeletal fixation and distraction osteogenesis were used in the three dogs reported here because this technique allowed progressive correction of the deformities and afforded the possibility of lengthening the tibiae, as was done in dogs 1 and 2. Other reported techniques describing acute correction of crural angular deformities include dome, opening wedge or closing wedge tibial osteotomies stabilised with a bone plate, a plate–rod construct or an external fixator 7,14–16 . Acute correction techniques do not allow potential or existing tibial length discrepancy to be addressed, because acute correction of length discrepancies at the time of angular correction is limited by soft tissue constraints 3 …”

Clinical Application of Macroporous Ceramic to Promote Bone Healing in Veterinary Clinical Cases

“…In both cases, the postoperative angles were corrected and maintained during the follow-up period, and, morphologically, the body of the tibia in the affected hind limb nearly equalled that found in healthy limbs. Dogs were able to walk a few days postoperatively, and the authors concluded that the corrective transverse-opening osteotomy together with synthetic bone graft substitute β-TCP and veterinary T plate fixation is an effective method for the treatment of pes varus in small-breed dogs [35]. A single case of tarsal joint fusion with β-TCP and platelet-rich plasma (PRP) was reported by Hauschild et al, and ACBG, and hence the need of additional surgery to harvest the bone graft, was successfully avoided.…”

The rationale behind novel bone grafting techniques in small animals

“…Thermochemical treatment of coral with ammonium phosphate results in tricalcium phosphate (TCP) d with a structure and porosity similar to cancellous bone. Synthetic β-tricalcium phosphate e has been used to fill gaps associated with open corrective osteotomies in Dachshunds, and was found to integrate with the surrounding bone within two months (20). Calcium phosphate materials are available in a variety of products, including blocks, granules, powders, and cements (21,22).…”