Original ArticleA Comparison of Acetate vs Digital Templating for Preoperative Planning of Total Hip Arthroplasty: Is Digital Templating Accurate and Safe?
Section snippets
Materials and Methods
Preoperative templating for THA requires standardized radiographs with consistent magnification and matching templates. Traditional pelvic and hip radiographs are performed with the x-ray tube at a standardized distance from the x-ray table 1, 2, 3, 12. The magnification of the images is proportional to the distance between the pelvis and the film. This distance can be affected by the size of the patient [1].
Traditional acetate templating uses a fixed magnification of the overlaid implant [1].
Results
Acetate templating predicted acetabular cup size within one size in 196 (78%) of 250 cases. Digital templating predicted acetabular cup size within one size in 30 (60%) of 50 cases. Acetate templating predicted femoral stem size within one size in 192 (77%) of 250 cases. Digital templating predicted femoral stem size within one size in 37 (74%) of 50 cases. Digital measurements significantly overpredicted cup size (negative error values, P < .001) (Table 1). Digital measurements significantly
Discussion
In this study, preoperative planning for THA was accurate and safe with acetate and digital templating. Digital templating, which represents a technologic innovation for reconstructive surgeons, was not more accurate than acetate templating. However, preoperative digital measurement was found to be acceptably safe for planning primary total hip arthroplasty operations. Preoperative acetate templating of appropriately magnified analog films demonstrated good to excellent interrater reliability.
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No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article. No funds were received in support of this study.
Investigation performed at the Department of Orthopedic Surgery, Lahey Clinic Medical Center, Burlington, Mass.