Why is wound contraction very slow?

I am working on mathematical model for healing of dermal wounds. For anyone who's a bit familiar with Physics and Math, for the model I use the Cauchy Momentum Equation as a basis, and from there I use already established literature to expand to a so-called morphoelastic model.

From a physical perspective, if a force is exerted, you would expect a material to start moving, upon which stresses arise, until a new balance is found. This all usually happens on a timescale of second. Now when wound healing is regarded, the contraction force is exerted by fibroblasts. I have read that wound contraction happens at a speed of up to 0.75/mm per day. On the one hand this is impressive, yet on the other hand it is very slow when viewed from the mechanical perspective.

So my question is: Is there a biological effect or phenomenon that slows down? Could it be that the migration speed of fibroblasts is the bottle neck? Or maybe skin is in some way tethered to underlying tissue? I know very little about biology, so any help would be appreciated!

• Is it really that slow? What are you comparing it to? If you're comparing it to simple muscle contraction, you should note that muscle movement is transient and returns to its original shape when the stimulus/energy input ceases. When a wound is healing, it wants to change its shape permanently so it's more like tissue growth. (1/2)
– Jam
Jul 3, 2019 at 15:42
• If you compare it with growth of maize root tips, which grow at only 2.4 mm/day or dendritic spine growth, which is only 0.13-0.17 mm/day it doesn't seem that bad. (2/2)
– Jam
Jul 3, 2019 at 15:42
• As far as my biological knowledge goes (which is not very far), wound contraction happens due to stresses induced by ((proto-)myo-)fibroblasts. Before, during, and after wound contraction, collagen fibres are secreted in order to replace the injured skin. The new arrangement of the collagen is reflected by the mechanical properties of the tissue. If wound contraction was to be attributed to a tissue growth-like process, the rate at which it happened would completely make sense to me. But from what I have understood, wound contraction is a mechanical process. Jul 3, 2019 at 20:41
• Your comment actually cuts right into the heart of morphoelasticity theory, where deformations are decomposed into an elastic (transient) and a plastic (growth) component Jul 3, 2019 at 20:43