Journal of Orthopaedic Surgery 2008;16(3):312-5
Morphologic differences of the distal femur
between Caucasian and Japanese women
K Urabe,1 OM Mahoney,2 K Mabuchi,3 M Itoman1
Department of Orthopaedic Surgery, Kitasato University School of Medicine, Kanagawa, Japan
Athens Orthopedic Clinic & Department of Kinesiology, University of Georgia, Athens, Georgia, USA
Department of Biomedical Engineering, School of Allied Health Sciences, Kitasato University, Kanagawa, Japan
longer in Caucasian women, but the posterior condyle
was longer in Japanese women.
ABSTRACT Conclusion. Both the size of the femur and the
anterior and posterior condyles are significantly
Purpose. To compare the morphology of the distal larger in Caucasian than Japanese women.
femur between Caucasian and Japanese women.
Methods. 30 Caucasian women aged 41 to 84 (mean, Key words: arthroplasty, replacement, knee; Asian continental
67) years and 70 Japanese women aged 54 to 86 (mean, ancestry group; continental population groups; European
70) years who underwent total knee arthroplasty for continental ancestry group; femur
osteoarthritis were randomly selected. Morphologic
measurements of the distal femur were compared using
lateral radiographs. Both race and height influenced INTRODUCTION
the morphology. To adjust for the influence of height
on morphology, each measurement was divided by Morphology of the distal femur helps elucidate the
the patient’s height and the ratios were compared. causes of osteoarthritis,1–3 the outcome of osteotomy
Results. Caucasian women were generally taller and for osteoarthritis,4,5 and the optimal design and
heavier (p<0.001) and had higher body mass index procedure for total knee arthroplasty (TKA).6,7 The
(p=0.03) than the Japanese women. Each morphologic ratio of anteroposterior width to mediolateral width
measurement of the distal femur was significantly of the distal femur differs between Caucasian and
longer in the Caucasian women. In both groups, Japanese populations,8,9 such that mismatch of the
anteroposterior width of the condyle correlated more prosthesis may occur.10 We aimed to compare the
with height than weight. In women of equal height, morphology of the distal femur between Caucasian
the anteroposterior and metaphyseal widths of the and Japanese osteoarthritic women using lateral
femur and the anterior and resected condyles were radiographs.
Address correspondence and reprint requests to: Dr Ken Urabe, Department of Orthopaedic Surgery, Kitasato University School
of Medicine, 1-15-1 Kitasato, Kanagawa, 228-8555, Japan. E-mail: firstname.lastname@example.org
Vol. 16 No. 3, December 2008 Morphologic differences of the distal femur between Caucasian and Japanese women 313
length of the remaining condyle.
Correlations between the AP width of the
condyle/shaft and height/weight were measured
using the Pearson correlation coefficient (r). Both race
and height influenced the morphology of the distal
femur. Therefore to adjust for the influence of height
on morphology, each measurement was divided by
the patient’s height and the ratios were compared.