Original Article - Clinical
Radiographic Evaluation of Early Periprosthetic Femoral Bone Contrast and Prosthetic Stem Alignment after Uncemented and Cemented Total Hip Replacement in Dogs
Article first published online: 20 DEC 2011
© Copyright 2011 by The American College of Veterinary Surgeons
Volume 41, Issue 1, pages 69–77, January 2012
How to Cite
Mostafa, A. A., Drüen, S., Nolte, I. and Wefstaedt, P. (2012), Radiographic Evaluation of Early Periprosthetic Femoral Bone Contrast and Prosthetic Stem Alignment after Uncemented and Cemented Total Hip Replacement in Dogs. Veterinary Surgery, 41: 69–77. doi: 10.1111/j.1532-950X.2011.00931.x
- Issue published online: 23 JAN 2012
- Article first published online: 20 DEC 2011
- Manuscript Accepted: JAN 2011
- Manuscript Received: OCT 2010
To radiographically evaluate periprosthetic femoral bone contrast and assess alignment of the prosthetic stem after uncemented and cemented total hip replacement (THR).
Prospective clinical study.
Dogs (n = 15).
Dogs were classified into uncemented (n = 8) and cemented (n = 7) THR groups. Radiographs were analyzed using image processing software to evaluate femoral bone contrast (gray scale value, GV) for each and combined modified Gruen zone(s) immediately and 4 months after THR. Modified Gruen zones were classified into 5 zones to analyze retrospectively the regional radiographic GV of the femur around uncemented and cemented prosthetic stem. Alignment of prosthetic stem was assessed immediately and 4 months postoperatively. Variables were compared by use of 2-tailed t-test, with P < .05 considered significant.
Zone 1 showed significant decrease in the mean bone GV 4 months after uncemented THR. No differences in zones 1–5 after 4 months of cemented THR. Combined zones showed significant decrease in overall mean bone GV 4 months after uncemented THR. No changes were observed 4 months after cemented THR. Number of limbs with varus-aligned femoral stem markedly increased after 4 months of uncemented THR.
Regional bone contrast and prosthetic stem alignment vary with the design of THR.