Patient Demographics and Anthropometric Measurements Predict Tibial and Femoral Component Sizing in Total Knee Arthroplasty

Abstract

Background: Accurate sizing is critical for the overall success of a total knee arthroplasty (TKA). This study's primary purpose was to investigate the ability to predict the tibial and femoral component size in a single implant system from patient demographics and anthropometric data. A secondary goal was to compare the predicted tibial and femoral component sizes from our statistical model with a previously validated electronic application used to predict the implant size. Methods: A consecutive series of 484 patients undergoing a primary TKA at a single institution was reviewed. Data on height, weight, body mass index, sex, age, and component size were collected. A proportional odds model was developed to predict tibial and femoral component sizes. The relationship between the proportional odds model predictions was also compared with the component sizes determined by the Arthroplasty Size Predictor electronic application. Results: Weight, height, and sex predicted the implanted component size with an accuracy of 54.0% (n ¼ 247/484) for the tibia and 51.1% (n ¼ 231/484) for the femur. The accuracy improved to 94.4% (n ¼ 457/ 484) for the tibia and 93.4% (n ¼ 452/484) for the femur within ±1 component size. Our data are highly correlated to the Arthroplasty Size Predictor for the predicted tibial component size (r ¼ 0.91, P < .001) and femoral component size (r ¼ 0.89, P < .001). Conclusions: Our novel templating model may improve operative efficiency for a single TKA system. Our findings have a high concordance with a widely available electronic application used to predict implant sizes for a variety of TKA systems.

Radiopacity Enhancements in Polymeric Implant Biomaterials: A Comprehensive Literature Review

“…25,42,87 These materials require radiopacity for many reasons, which include evaluation of root canal fillings, recurrent caries, overhangs, voids, and remnant cement during cement removal. 27,35,42,88 Filling and luting materials require differing levels of radiopacity depending on their surrounding anatomical structures. 35 In dentistry, either transmission densitometers or digital image analyses are used to evaluate the optical density/radiopacity in dental radiographs.…”

“…Dental implants are generally made from metal, normally titanium (implant and abutment) and a ceramic or metallic crown, all of which possess adequate radiopacity for radiological imaging. ,,, For this reason, the use of contrast agents in oral implant dentistry mainly applies to filling and luting materials such as composite resins, endodontic sealers, and cements, which should be distinguishable from the surrounding anatomic structures. ,, These materials require radiopacity for many reasons, which include evaluation of root canal fillings, recurrent caries, overhangs, voids, and remnant cement during cement removal. ,,, …”

“… 25 , 42 , 87 These materials require radiopacity for many reasons, which include evaluation of root canal fillings, recurrent caries, overhangs, voids, and remnant cement during cement removal. 27 , 35 , 42 , 88 …”

Preoperative predictors of implant size in patients undergoing total knee arthroplasty: a retrospective cohort study

“…Height, weight, and sex predicted the implanted component size with an accuracy of 54.0% for the tibia and 51.1% for the femur. These results were highly correlated to the tibial and femoral component size predicted by Arthroplasty Size Predictor [ 15 ].…”

Prediction of Total Knee Arthroplasty Sizes with Demographics, including Hand and Foot Sizes

“…Some studies have published TKA sizing equations that utilize the aforementioned demographic variables to predict TKA implant sizes (5,(7)(8)(9)(10). Demographic-based prediction models have demonstrated accuracy rates of 90-100% within one implant size (5,8,11,12). Additionally, other reports have shown 1 significant correlation between shoe size and TKA component sizes (13,14).…”