Risk factors for femoral fracture after canine press-fit cementless total hip arthroplasty.
OBJECTIVE
To evaluate risk factors for femoral fracture after porous-coated cementless total hip arthroplasty (THA).


METHODS
Case series.


METHODS
Dogs (n=74) that had cementless THA (n=84).


METHODS
Medical records of dogs from 2 referral hospitals were reviewed for occurrence of postoperative femoral fracture. Patient and operative (age, breed, sex, weight, and canal flare index [CFI], indication for arthroplasty, intraoperative fissure, cerclage usage, and implant sizes) factors were analyzed. Assessment of implant positioning and canal fill was performed on immediate postoperative radiographs. Femoral fractures (n=11) were evaluated and compared with 73 cases without fracture that met the inclusion criteria.


RESULTS
Mean (+/-SEM) age was 7.30+/-0.69 years for dogs with, and 4.77+/-0.37 years for dogs without femoral fracture. Age was positively associated with fracture (P=.022). Mean (+/-SEM) CFI was 1.80+/-0.09 for dogs with, and 1.98+/-0.04 for dogs without fracture. CFI was negatively associated with fracture (P=.045). Body weight, intraoperative fissure, cerclage use, implant size, position, and canal fill did not influence the occurrence of femoral fracture.


CONCLUSIONS
Older dogs and dogs with lower CFI may be at increased risk for femoral fracture after porous-coated cementless THA.


CONCLUSIONS
Risk factors exist for femoral fracture after cementless THA using porous-coated implants, and should be critically evaluated during the patient selection. These risks should be weighed against the benefits of the system, and measures to minimize femoral fracture in at-risk patients studied.
Ganz
Seth Mathus
SM
Fox Valley Animal Referral Center, Appleton, WI, USA.
Jackson
Joshua
J
VanEnkevort
Bruce
B
D000367:Age Factors; D000818:Animals; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000662:veterinary*; D001843:Bone Cements; D004285:Dogs; D005264:Femoral Fractures / Q000209:etiology / Q000662:veterinary*; D018579:Patient Selection; D011183:Postoperative Complications / Q000662:veterinary*; D018570:Risk Assessment; D012307:Risk Factors
D001843:Bone Cements