Evaluation of Anthropometric Measurements of the Aspect Ratio of Knee in Indian Population and its Correlation with the Sizing of Current Knee Arthroplasty System

Abstract

Background Most of the commercially available TKR implants are designed for western populations, which are known to have larger build and stature compared to Asian counterparts often leading to mismatch between resected bony surfaces and implant components. There is paucity of morphometric data of distal femur and proximal tibia in the Indian population. Thus, it becomes important to obtain anthropometric data to achieve the best stability and long-term success of implant. Materials and Methods Intraoperative morphological measurements of 100 knees (59 female and 41 males) were done using vernier calliper during TKR. The anteroposterior (AP) and mediolateral (ML) dimensions of cross-section of the femur and tibia were noted before bony resection. The aspect ratios were calculated and compared with that of implant used (DePuy, Stryker, Maxx). Results We have found that Indian males have larger dimensions of distal femur as well as proximal tibia than females. There exists some degree of mismatch in patients’ dimensions and the sizes of all the three commercially available implant system as well their aspect ratios. Conclusion Specific designing of implants with dimensions in accordance with the morphometric measurements of Indian population should be done. Also gender specific implant designing should be done.

Estimating aspect ratio of the distal femur and proximal tibia in the Emirati population from MRI scans of the knee: a preliminary experience

“…There are several reasons contributing to this, including an increasing elderly population with a higher life expectancy, increased accessibility and awareness of medical facilities and procedures, a larger group of younger, active and physically demanding patients who undergo total knee replacement to help alleviate end-stage symptoms enabling functional return of activities, and a general overall acceptance of knee arthroplasty as an excellent procedure to improve pain, function and mobility in end-stage arthritis 18 , 21 . Since most knee implants in the market are generally tailored for those of European descent, our objective was to estimate dimensions of the Emirati knee, compare morphological data with other ethnic populations, and investigate differences in knee morphometry between genders within the Emirati population 22 . Identification of differences are crucial to gender and ethnic specific design and longevity of implant.…”

A Reproducible and Robust Representation of Tibiofemoral Kinematics of the Healthy Knee Joint during Stair Descent using REFRAME – Part I: REFRAME Foundations and Validation

“…Intuitively, envisioning solely what is usually clinically understood by AP translation between the femur and tibia (i.e. excluding any cross-talk effects entirely) in a healthy subject with intact soft-tissue structures, 7 mm of displacement seems highly plausible, especially considering the proximal tibia has an average AP dimension of about 50 mm [34,35]). However, notwithstanding the possibility to make further first crude attempts at clinically interpreting REFRAMEd signals, the clinical "accuracy" of the values given by the REFRAMEd kinematic signals is very much open for debate, and additional efforts are certainly needed before any kind of consensus can be reached.…”