MMP3 and rheumatoid arthritis: BMD, bone mineral density; BMI, body mass index; BR, buckling ratio; CRP, C-reactive protein; CSA, cross-sectional area; CSMI, cross-sectional moment of inertia; CT, cortical thickness; DAS28, Disease Activity Score assessing 28 joints; DM, diabetes mellitus; ESR, erythrocyte sedimentation rate; FS, femoral shaft; GCs, glucocorticoids; IT, intertrochanteric region; MMP-3, matrix metalloproteinase-3; NN, narrow neck; RA, rheumatoid arthritis; RF, rheumatoid factor; TBS, trabecular bone score; Z, section modulus