Three-dimensional morphometric differences of resected distal femurs and proximal tibias in osteoarthritic and normal knees

Abstract

Background There is a paucity of data concerning the morphological differences of resected distal femurs and proximal tibias in osteoarthritic (OA) and normal knees. The objective of this study was to determine whether morphometric differences in the surfaces of resected distal femurs and proximal tibias exist between OA and normal knees in a Chinese population. Methods Ninety-four OA knees and ninety-five normal knees were evaluated in Chinese individuals. Computed tomography was used to measure the femoral mediolateral (fML), medial anteroposterior (fMAP), lateral anteroposterior (fLAP), medial condylar width (fMCW), lateral condylar width (fLCW), medial posterior condylar curvature radii (fMCR), lateral posterior condyle curvature radii (fLCR), fML/fMAP aspect ratio, tibial mediolateral (tML), middle anteroposterior (tAP), medial anteroposterior (tMAP), and lateral anteroposterior (tLAP) tML/tMAP aspect ratio to determine the morphologic differences between OA and normal knees. Results The average fMCW and tMAP dimensions of OA knees were larger than those of normal knees in both male and female (p <0.05). The fMAP/fML aspect ratio and tMAP/tML aspect ratio were also significantly different in both sexs (p <0.05). OA knees have an oval-shaped distal femur with a wider ML length and more spherical-shaped proximal tibiae with relatively narrow ML dimensions. Conclusions The study revealed the morphological differences in fMCW, tMAP, fMAP/fML and tMAP/tML between OA and normal knees in both males and females. These findings may provide guidelines that can be used to design better knee implants that are more size-matched for OA knees.

A Morphometric Study of the Distal Femoral Resected Surface In Osteoarthritis Knees of the Patients in Southwest China and a Comparison with Femoral Components in Six Total Knee Arthroplasty Systems

“…We believe that our data are more reliable. [16][17][18]20,22,37 Of course, this study has some limitations. First, all patients enrolled in this study mainly came from the southwest region of China, which may not be representative of the entire Chinese population.…”

“…16 Dong et al measured the morphometry of the distal femur resected surface of both osteoarthritis (OA) and normal knees, concluding that OA knees have an oval-shaped distal femur with a wider ML length compared with normal knees. 17 According to the results of another study, individuals under 40 had significantly different knee morphologies from those over 40. 19 Xu et al 24 also conducted the morphometric analysis of Chinese OA knees, however, their study was performed on the distal femur that had completed quadruple osteotomy (anterior, posterior, posterior chamfer, and then anterior chamfer).…”

“…11 Currently, most contemporary TKA prostheses available in Asia are designed based on anthropometric measurements of Caucasian knees, which has proven to be inappropriate in Asian patients. [12][13][14][15] Little morphometric research on Chinese knees has been published in recent years, [16][17][18][19][20][21][22][23] and of those that have, only a few 16,18,23,24 have compared the measured morphometric data of the distal femur resection surfaces with the size of femoral components. Since most osteoarthritic (OA) knees that undergo TKA are distorted and may have various resected surfaces, Cheng et al's choice of normal knees as the research participants may not have been acceptable.…”

“…16 Dong et al . measured the morphometry of the distal femur resected surface of both osteoarthritis (OA) and normal knees, concluding that OA knees have an oval‐shaped distal femur with a wider ML length compared with normal knees 17 . According to the results of another study, individuals under 40 had significantly different knee morphologies from those over 40 19 .…”

A study on morphometric features of the distal femoral resected surface in the osteoarthritis knees of Chinese patients and the differences in Males and Females.

“…The anthropometric measurement of the distal femoral resected surface could be more valuable because they are the nal size prepared for the femoral component before implantation [11]. As the purpose of the morphometric research was to improve the design of the prosthesis, Dong XH et al [12] measured the morphometry of the resected distal femur surface between osteoarthritis (OA) and normal knees, nding that OA knees have an oval-shaped distal femur with a wider ML length than the normal knees. We insist that research should be based on data from osteoarthritis (OA) knees rather than normal knees.…”