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Table 1 Demographic, disease-specific, and DXA characteristics of rheumatic patients scheduled for THA and TKA

From: Bone mineral density assessment by DXA in rheumatic patients with end-stage osteoarthritis undergoing total joint arthroplasty

  THA TKA  
Mean (SD) or n (%) Mean (SD) or n (%) p-value
Demographic characteristics
 Females (%) 11/25 (44%) 18/25 (72%) 0.045*#
 Age (yr.) 71.0 (10.8) 63.2 (14.2) 0.035*
 Height (cm) 170.2 (8.2) 166.6 (10.6) 0.093
 Weight (kg) 77.4 (13.4) 78.1 (16.2) 0.861
 BMI (kg/m2) 26.6 (3.6) 28.5 (5.4) 0.150
 Smoking (%) 4/25 (16%) 4/25 (16%) 1.0#
Disease & treatment regimen
 RA 21/25 (84%) 21/25 (84%) 1.000#
 PsA 1/25 (4%) 3/25 (12%) 0.297#
 AS 3/25 (12%) 1/25 (4%) 0.297#
 Glucocorticoids 12/25 (48%) 17/25 (68%) 0.152
 Glucocorticoid dose (mg) 5.3 (2.7) 5.4 (3.3) 0.937
 MTX (%) 12/25 (48%) 17/25 (68%) 0.152#
 MTX dose (mg) 14.2 (2.9) 14.7 (4.0) 0.719
 Biologicals (%) 6/25 (24%) 4/25 (16%) 0.480#
OA severity & implant fixation
 Kellgren-Lawrence Score 3.1 (0.73) 3.1 (0.64) 0.837
 Cemented femoral component fixation 11/25 (44%) 14/25 (56%) 0.396#
DXA & osteopenia/osteoporosis
 T-score – femur lowest −1.0 (1.3) −1.7 (1.2) 0.067
 Z-score – femur lowest 0.0 (1.2) −0.9 (1.2) 0.010*
 T-score – affected femur −0.8 (1.3) −1.4 (1.3) 0.114
 Z-score – affected femur 0.2 (1.2) −0.7 (1.2) 0.013*
 T-score – contralateral femur −0.8 (1.1) −1.4 (1.2) 0.136
 Z-score – contralateral femur 0.3 (0.9) −0.6 (1.2) 0.012*
 T-score – lumbar spine −0.5 (2.1) −1.1 (1.8) 0.333
 Z-score – lumbar spine 0.4 (1.8) −0.4 (2.2) 0.180
 Osteoporosis (T-score ≤ −2.5) 3/25 (12%) 8/25 (32%) 0.088#
 Osteopenia (T-score ≤ −1 - ≤ −2.5) 13/25 (52%) 13/25 (52%) 1.000#
 Vitamin D supplementation 6/25 (24%) 7/25 (26%) 0.747#
 Bone-specific treatment 1/25 (4%) 2/25 (8%) 0.552#
 Indication bone-specific treatment 10/25 (40%) 11/25 (44%) 0.774#
  1. *indicates significant differences. #determined by the Chi2 test