Table 2.
Cancellous Histomorphometric Characteristics at the Proximal Tibial Metaphysis after Sham Surgery (T9 Laminectomy) or Moderate/Severe (250 Kdyne) Spinal Cord Injury Alone or in Combination with a Low or High Dose of Testosterone-Enanthate
SHAM (a) | SCI (b) | SCI+LowTE (c) | SCI+HighTE (d) | |
---|---|---|---|---|
Cn.BV/TV, % | 4.6±2.6b* | 0.8±0.5a*,c*,d* | 3.5±1.4b* | 4.6±2.6b* |
Tb.N, #/mm | 3.7±1.9b* | 0.9±0.6a*,c*,d* | 3.3±1.3b* | 4.1±2.1b* |
Tb.Wi, μm | 14.6±3.2b | 10.7±3.0a,d | 12.5±1.2 | 13.0±1.4b |
Tb.Sp, μm | 463±566b* | 1520±911a*,c*,d* | 384±300b* | 322±224b* |
Oc.S/BS, % | 4.2±1.5 | 6.3±3.6d | 4.2±1.1 | 3.2±0.7b |
Ob.S/BS, % | 19.2±4.6 | 16.0±8.4 | 14.5±4.3 | 14.1±6.6 |
OS/BS, % | 16.1±3.6 | 13.5±7.0 | 12.2±4.4 | 11.8±5.3 |
MS/BS, % | 13.5±4.2b*,c* | 2.6±1.6a*,c*,d | 5.7±2.3a*,b* | 8.9±6.5b |
MAR, μm/day | 1.2±0.5b | 0.6±0.4a,d | 0.8±0.3 | 1.2±0.4b |
BFR/BS (dL), μm3/μm2/day | 16.6±7.8b*,c* | 1.2±0.9a*,c*,d* | 4.9±3.3a*,b* | 11.4±11.7b* |
Values are means±standard deviation of n=8–9/group. Letters a–d indicate differences from respectively labeled groups at p<0.05 or * p<0.01 (a=vs. SHAM, b=vs. SCI, c=vs. SCI+LowTE, d=vs. SCI+HighTE). SCI, spinal cord injury; SCI+LowTE, spinal cord injury plus low-dose testosterone-enanthate; SCI+HighTE, spinal cord injury plus high-dose testosterone-enanthate. Cn.BV/TV, cancellous bone volume; Tb.N, trabecular number, Tb.Wi, trabecular width; Tb.Sp, trabecular separation; Oc.S/BS, osteoclast surface; Ob.S/BS, osteoblast surface; OS/BS, osteoid surface; MS/BS, mineralizing surface; MAR, mineral apposition rate, BFR/BS, bone formation rate/bone surface.