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Objective

To document outcome in 2 dogs and 2 cats after conversion of femoral head and neck excision (FHNE) to total hip replacement (THR).

Study Design

Case series.

Animals

Dogs (n = 2) and 2 cats.

Methods

For 1 dog and 2 cats, THR was performed using cemented acetabular and femoral components. Noncemented acetabular and cemented femoral components were used in 1 dog.

Results

All animals presented with severe hip pain and chronic lameness after unsuccessful FHNE. Potential causes of suboptimal outcome after FHNE were incomplete resection of the femoral neck (n = 3) and fibrous adhesions involving the sciatic nerve (n = 2). Post-FHNE remodeling of the proximal femur and acetabulum necessitated unconventional modifications of surgical technique. In all 4 cases, final clinical outcome and radiographic reassessment were satisfactory. Aseptic loosening of the acetabular bone-cement interface necessitating surgical revision was the only complication noted in 1 cat.

Conclusions

Despite severe preoperative pain and chronic functional impairment in all cases, conversion of FHNE to THR produced marked clinical improvement including return to unrestricted exercise within 12 weeks of surgery.