Article Figures & Data
Figures
- Figure 1
Graph of biomechanical parameters studied by clinical variables (bone mineral density, age, vertebral body height, and disc height). Each circle represents angular position–data recorded quasi-statically (after holding a steady load for 45 seconds) at the 6 different loads applied. The angular displacement where the lax zone transitions to the stiff zone is found by extrapolating a best-fit to points 4, 5, and 6 to 0 load. The lax and stiff zones sum to provide the range of motion. Used with permission from Barrow Neurological Institute.
- Figure 2
Mobility of all lumbar levels plotted versus age during flexion-extension for (A) range of motion (ROM), (B) lax zone (LZ), and (C) stiff zone (SZ) including males (M) and females (F). Note the lack of correlation when considering ROM (LZ+SZ) (M: r = 0.044, P = .612; F: r = 0.020, P = .833) but positive correlations considering LZ (M: r = 0.160, P = .063; F: r = 0.182, P = .050) and negative correlations when considering SZ (M: r = −0.414, P < .001; F: r = −0.488, P < .001). Used with permission from Barrow Neurological Institute.
- Figure 3
Mobility of all lumbar levels plotted versus bone mineral density (BMD) during flexion-extension for (A) range of motion (ROM), (B) lax zone (LZ), and (C) stiff zone (SZ) including males (M) and females (F). Note the negative correlations when considering ROM (LZ+SZ) (M, r = −0.311, P < .001; F: r = −0.269, P = .005), and LZ (M: r = −0.296, P < .001; F: r = −0.269, P = .009) but lack of correlations when considering SZ (M: r = −0.128, P = .140; F: r = −0.135, P = .163). Used with permission from Barrow Neurological Institute.
- Figure 4
Mobility of all lumbar levels plotted versus vertebral body height during lateral bending for (A) range of motion (ROM), (B) lax zone (LZ), and (C) stiff zone (SZ) including males and females. Note the lack of correlations with vertebral body height for male segments (ROM: r = 0.010, P = .916; LZ: r = 0.003, P = .997; SZ: r = −0.006, P = .95), compared with the correlations with vertebral body height for female segments (ROM: r = 0.173, P = .117; LZ: r = 0.230, P = .037; SZ: r = 0.035, P = .751). Used with permission from Barrow Neurological Institute.
- Figure 5
Mobility of all lumbar levels plotted versus disc height during flexion-extension for (A) range of motion (ROM), (B) lax zone (LZ), and (C) stiff zone (SZ) including males and females. Note the slight negative correlations for male segments for ROM (r = −0.178, P = .087) and LZ (r = −0.266, P = .009) while positive for SZ (r = 0.206, P = .046). There were no significant correlations for female segments (ROM: r = 0.103, P = .407; LZ: r = 0.133, P = .285; and SZ: −0.165, P = .181). Used with permission from Barrow Neurological Institute.
- Figure 6
Mobility of all lumbar levels plotted versus disc height during lateral bending for (A) range of motion (ROM), (B) lax zone (LZ), and (C) stiff zone (SZ) for males (M) and females (F). Note the slightly positive correlation when considering ROM (LZ+SZ) (M: r = 0.127, P = .222; F: r = 0.283, P = .020), lack of correlation when considering LZ (M: r = 0.072, P = .489; F: r = 0.117, P = .346), and positive correlation when considering SZ (M: r = 0.358, P < .001; F: r = 0.125, P = .313). Used with permission from Barrow Neurological Institute.
- Figure 7
Mobility of all lumbar levels plotted versus disc height during axial rotation for (A) range of motion (ROM), (B) lax zone (LZ), and (C) stiff zone (SZ) for males and females. Note the negative correlations for male segments (ROM: r = −0.244, P = .018; LZ: r = −0.230, P = .026; SZ: r = −0.125, P = .228), and positive correlations for female segments (ROM: r = 0.120, P = .333; LZ: r = 0.119, P = .336; and SZ: r = 0.237, P = .054). Used with permission from Barrow Neurological Institute.
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