Pressure (Continued)

and then this 200 nm (larger) image of a bone showing collagen fibrils which have been mineralized "by being coated with knobby mineral plates of hydroxyapatite. " External to (i.e. on top of and surrounding) these mineralized fibrils is the(visible)protein matrix called bone glue that acts as an interface or bond between the fibrils.
Now, what happens to this cell as our horse breezes? A much larger image of the material appears below:

My point in the many illustrations is to emphasize first the lattice or matrix by which the bone materials are constructed and held together. You can see this patterning even in the larger image above, and we may imagine that initially the pressure of concussion caused by the hoof strike will compress the above materials, or will it? I'll continue next post.

Training:
Tues. 8/12: The third consecutive training night since Art's tendon injury, and in this workout we'll test the tendon to see if we get any swelling. As it turns out, we do. We're in race training now, and so note, significantly, we're doing tack work BEFORE the riderless work, whereas previously we'd done the reverse. Both horses trotted a .8 mile, and then (in near dark) were driven riderless at intermittent fast-slow speeds with the fastest at 14 sec/f. We wanted a fast workout with Art without doing too much. Afterwards we had slight upper tendon swelling (as I'd half way expected), and an hour later some significant thickening. BUT, the swelling disappeared as expected by the next morning. The tendon is still in a state of healing and we'll have to be careful.
Wed. 8/13 Off.