Age-related cancellous bone loss in the proximal femur of caucasian females.
The purpose of this investigation was to directly define the age-related intrafemoral variations in cancellous bone density, bone mineralization and rate of bone loss in a cadaveric population of Caucasian female femoral necks and trochanters. Forty-three Caucasian female femora were obtained and divided into premenopausal, postmenopausal and elderly age groups. The neck and trochanter were removed, and cores of cancellous bone were taken from the superior, middle and inferior regions; volume fraction and ash fraction were determined for each core. The cancellous bone volume fraction of the neck was significantly greater than that of the trochanter, as was that of the inferior region of the neck compared with the superior and middle regions at all age groups (p<0.05). The mean neck/trochanter and neck inferior/superior volume fraction ratios did not change with age; however, the variance increased with age (p<0.001). This increasing variability with age suggests that there may be a subpopulation of individuals within the elderly Caucasian population with a significantly different intrafemoral bone density distribution than was present prior to menopause. This study identified no mineralization changes with age in the cancellous bone of the proximal femur (p>0.05). The influence of increased neck/trochanter and neck inferior/superior ratios on femoral neck integrity and fracture prediction is of interest and requires further investigation.
Lundeen
G A
GA
Bone and Joint Research Laboratory, VAMC, Salt Lake City, Utah 84148, USA.
Vajda
E G
EG
Bloebaum
R D
RD
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D015519:Bone Density / Q000502:physiology*; D002102:Cadaver; D002113:Calcification, Physiologic / Q000502:physiology; D005260:Female; D005270:Femur Head / Q000378:metabolism / Q000503:physiopathology*; D005272:Femur Neck / Q000378:metabolism / Q000503:physiopathology*; D006801:Humans; D008875:Middle Aged; D010024:Osteoporosis / Q000378:metabolism / Q000503:physiopathology*; D015663:Osteoporosis, Postmenopausal / Q000378:metabolism; D017697:Premenopause; D044465:White People