Influence of canal preparation depth on the incidence of femoral medullary infarction with Zurich Cementless Canine Total Hip arthroplasty.
OBJECTIVE
To determine the incidence of femoral medullary infarction after modifying the depth of femoral reaming and filing when performing total hip replacement (THR) using the Zurich Cementless Total Hip Replacement system (ZCTHR).


METHODS
Case series.


METHODS
Dogs (n=31) that had ZCTHR (34).


METHODS
Thirty-one dogs (34 THR) had ZCTHR (May 2003-September 2006) and with >1 year radiographic (craniocaudal, mediolateral views) follow-up after THR were evaluated for the presence of femoral medullary infarcts. Incidence was compared with a previous study performed before the technique modification.


RESULTS
Femoral medullary infarction occurred in 1 femur (2.9%; dog <18 months at THR) compared with 19.5% before the technique change, a significant decrease (P<.001).


CONCLUSIONS
Limiting the depth of reaming and filing of the medullary canal resulted in a significant decrease in the incidence of femoral medullary infarction.


CONCLUSIONS
Depth of reaming and filing the medullary canal should be limited when performing THR using the ZCTHR.
Haney
Davida R
DR
Affiliated Veterinary Specialists, Maitland, FL 32751, USA. davidavet13@aol.com
Peck
Jeffrey N
JN
D000818:Animals; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000379:methods / Q000662:veterinary*; D004283:Dog Diseases / Q000517:prevention & control* / Q000601:surgery; D004285:Dogs; D005260:Female; D005269:Femur / Q000098:blood supply* / Q000000981:diagnostic imaging; D006619:Hip Dysplasia, Canine / Q000601:surgery; D006622:Hip Prosthesis / Q000009:adverse effects / Q000662:veterinary; D007238:Infarction / Q000209:etiology / Q000517:prevention & control / Q000662:veterinary*; D008297:Male; D011183:Postoperative Complications / Q000517:prevention & control / Q000662:veterinary*; D011859:Radiography