The relationship of antiresorptive drug use to structural findings and symptoms of knee osteoarthritis.
OBJECTIVE
To examine the cross-sectional association between use of medications that have a bone antiresorptive effect (estrogen, raloxifene, and alendronate) and both the structural features of knee osteoarthritis (OA), assessed by magnetic resonance imaging (MRI) and radiography, and the symptoms of knee OA in elderly women.


METHODS
Women in the Health, Aging and Body Composition Study underwent MRI and radiography of the knee if they reported symptoms of knee OA, and women without significant knee symptoms were selected as controls. MR images of the knee were assessed for multiple features of OA using the Whole-Organ MRI scoring method, and radiographs were read for Kellgren and Lawrence grade and individual features of OA. Concurrent medication use and knee symptoms were assessed by interview, and knee pain severity was evaluated using the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC).


RESULTS
There were 818 postmenopausal women from whom we obtained MR images of the knee and data on medication use. Among these women, 214 (26.2%) were receiving antiresorptive drugs. We found no significant association between overall use of antiresorptive drugs and the presence of knee pain and radiographic changes of OA of the knee. Use of alendronate, but not estrogen, was associated with less severity of knee pain as assessed by WOMAC scores. Both alendronate use and estrogen use were associated with significantly less subchondral bone attrition and bone marrow edema-like abnormalities in the knee as assessed by MRI, as compared with women who had not received these medications.


CONCLUSIONS
Elderly women being treated with alendronate and estrogen had a significantly decreased prevalence of knee OA-related subchondral bone lesions compared with those reporting no use of these medications. Alendronate use was also associated with a reduction in knee pain according to the WOMAC scores.
Carbone
Laura D
LD
University of Tennessee Health Sciences Center, 956 Court Avenue, Rm. E336 Coleman Building, Memphis, TN 38163, USA. lcarbone@utmem.edu
Nevitt
Michael C
MC
Wildy
Kathryn
K
Barrow
Karen D
KD
Harris
Fran
F
Felson
David
D
Peterfy
Charles
C
Visser
Marjolein
M
Harris
Tamara B
TB
Wang
Benjamin W E
BW
Kritchevsky
Stephen B
SB
D000368:Aged; D019386:Alendronate / Q000627:therapeutic use*; D001175:Arthrography; D001862:Bone Resorption / Q000517:prevention & control*; D016022:Case-Control Studies; D003430:Cross-Sectional Studies; D004967:Estrogens / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D007717:Knee / Q000000981:diagnostic imaging / Q000473:pathology; D008279:Magnetic Resonance Imaging; D020370:Osteoarthritis, Knee / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000517:prevention & control*; D010146:Pain / Q000517:prevention & control*; D012720:Severity of Illness Index
D004967:Estrogens; D019386:Alendronate