The Reliability of Radiographic Assessment of Femoral Neck-Shaft and Implant Angulation in Hip Resurfacing Arthroplasty

Abstract Fifteen sets of patient radiographs were analyzed by 3 different observers on 2 occasions. Each observer measured the femoral neck-shaft angles (NSAs) of the preoperative digital radiographs and stem-shaft angles (SSAs) of the postoperative radiographs. The effect of femur position on SSA m...

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Bibliographic Details
Published in:The Journal of arthroplasty 2009-04, Vol.24 (3), p.333-340
Main Authors: Olsen, Michael, BSc, PhD, Davis, Edward T., MB, ChB, MSc, FRCS, Gallie, Price A.M., FRACS, Waddell, James P., MD, FRCS(C), Schemitsch, Emil H., MD, FRCS(C)
Format: Article
Language:English
Subjects:
Arthroplasty, Replacement, Hip - adverse effects
Arthroplasty, Replacement, Hip - methods
Femur - diagnostic imaging
Femur Neck - diagnostic imaging
Hip Prosthesis
hip resurfacing
Humans
measurement error
neck-shaft angle
Orthopedics
Osteoarthritis, Hip - surgery
preoperative planning
Prosthesis Fitting
Radiographic Image Enhancement
Reproducibility of Results
stem-shaft angle
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Summary:Abstract Fifteen sets of patient radiographs were analyzed by 3 different observers on 2 occasions. Each observer measured the femoral neck-shaft angles (NSAs) of the preoperative digital radiographs and stem-shaft angles (SSAs) of the postoperative radiographs. The effect of femur position on SSA measured by digital radiographs was also investigated using a resurfaced synthetic femur. Radiographs were taken with the synthetic specimen positioned in 10° increments of either flexion or rotation. Measurement by digital radiographs proved less than optimal in assessing preoperative NSA but was better in assessing the postoperative component SSA. External rotation of 30° and flexion of 40° resulted in a clinically significant disparity in SSA measurements. Patient malposition during radiographic imaging can contribute to erroneous NSA and SSA results.
ISSN:0883-5403
1532-8406
DOI:10.1016/j.arth.2008.01.304