Bone Cell Repair

After acknowledging cellular fracture mechanics Rooney declined further study. How far Rooney got with fractures is indicated in the link below, which serves at this point as an interesting historical reference:

http://www.horseshoes.com/farrierssites/sites/rooney/fracturesoflongbones/fracturesoflongbones.htm

While we want to avoid serious fracture as considered in Rooney's article, day to day we're more consistently interested in how soon we can go again given whatever damage was done. This post will consider the repair process in damaged bone cells and speed of repair.

Last post on this I surmised, hypothesized, wildly speculated (concluded) that:
1. In a 240 stride race there is some minimal bone cell damage.
2. That this damage involves but 1%(or less) of the cannon bone cells.
3. That since 4% of bone cells at anyone time are in process of construction or destruction, an additional 1% damage seems insignificant.
4. BUT, that there is the concern of accumulated damage from multiple breezing events e.g. 1%+1%+1% etc. unless there is repair!

Consider what happens when Preston Burch breezes Preakness winner Bold 10 times per month sans any process of repairing damaged bone cells. At the end of the month Bold would have 14% of his cannon bone cells fractured. (10% + the 4% undergoing normal reconstruction).

That 14% damage obviously fails to occur is one reason for my calculation of 1% damage or less per race. The 1% figure will be further substantiated as the analysis proceeds.

There has to be a fairly rapid bone cell repair process since were it otherwise, the horse Bold would be in grave danger for breeze #11.

What thus is the process of repair for a single bone cell and how quickly does complete repair take place?

Google reveal nothing on this, so engage in some speculation and put together some info that we know. We know, e.g. that simple soft tissue lacerations generally take about two weeks for complete healing. Horse gets a simple deep cut, it's mostly healed within two weeks.

Can the rate of healing/repair be any different for bone cells?

Here are reasons why bone cells might repair slower than soft tissue:
1. There is far less immediate circulation in the form of capillaries near our damaged bone cell than with soft tissue, and hence less piping to transfer repair materials.

Here are reasons why bone cells might actually repair faster than soft tissue:
1. Unlike soft tissue, bone cells have an existing matrix around which repair materials may congeal.

Thus, may we conclude that though bone cell repair is hindered by lack of immediate capillary circulation, it is greatly aided because the repair materials (which will be secreted by the local collagen cells) will immediately commence congealing around the existing lattice.

Do we then have a hardened, good as new, bone cell within two weeks after damage? I'm still thinking about that one.

Training:
A brief August rain respite after the wettest KC July in history has turned into an early September deluge. The 3 inches of rain we received from the 3rd to the 5th was topped off by 3.1 meteorological inches this morning, and it drizzled all day Saturday the 8th for good measure. We got enough rain this morning to put us out of the galloping business for the week absent unusual drying. There's little to be done but proceed with plans to get to the race track as quickly as possible, a dry one preferably. Here's what our training looked like since some decent galloping after the early August tendon injury:
Tues. 9/3--normal off day.
Wed. Off rain.
Thurs. Off rain.
Fri. Off--could have gone but farm still a complete mess.
Sat. Art 1 mile trot under tack. Both horses 10 min riderless slow in the mud.
Sun: Art. 1 mile trot with some galloping where we could under tack, both horses a fairly fast intense 10 min. riderless in the mud.
Mon. 3.1 more inches. Off.