What Remains After It Heals

Once the cast comes off, you cannot make a full fist. When you rotate your wrist, it catches at a certain angle, and after using it a little, it feels heavy by evening. Yet you were told the bone healed well.

Both statements are true. They simply measure different things. One measures whether the break has been fixed; the other measures whether the arm can be used the way it once was. The test that checks whether the bone has healed looks only at the former. It does not tell you about the rest, not because it missed something, but because it was measuring something different from the start.

What Broke Is the Bone, but What Was Injured Is Not Only the Bone

At the moment of fracture, other tissues are compressed, torn, and swollen along with it — the thin membrane covering the bone (the periosteum), the sac enclosing the joint (the joint capsule), ligaments and tendons, muscle and the fascia running through it, the lymphatic vessels that carry fluid away, and the fine nerves and blood vessels running through the gaps between them.

Being told the bone has healed means that, among all of this, the bone's part of the job is finished. Whether the bone has healed or not is clear-cut, so it is checked first. Everything else keeps moving afterward, each at its own pace.

While It Goes Unused, a Loop Closes

Fluid that pools at an injury does not return the way it came. A substantial share of it drains out slowly through a separate path — the lymphatic vessels. Much of the force that pushes it along that path comes from the movement of the surrounding tissue. Muscles contracting and joints bending and straightening are, in themselves, that force.

But an injured spot hurts, so it does not move.

Because it hurts, you use it less. Because you use it less, the fluid drains more slowly. Tissue holding fluid becomes heavy and stiff. That makes it hurt more, and you use it even less. If this loop turns for months, the site becomes uncomfortable for a different reason than the original injury. It is the same path I described in Why Swelling Takes So Long to Settle.

The Body Narrows the Range You Do Not Use

When a joint cannot move for a long time, the body adjusts its range to match how much it is currently used. In animal studies, muscle and tendon narrow the range of motion first, and as time goes on, the changes in the tissue enclosing the joint itself grow larger.

From the joint's standpoint, this makes sense. Keeping an unused range wide costs that much more effort to maintain. The trouble is, when you start using it again, that narrowed range is the first thing you run into.

Recovery Has an Order

Being fixed and being used again do not proceed side by side. The former has to be nearing its end before the latter can begin. As long as the break is still unstable, you cannot use the arm, so the portion of recovery that comes from use does not even begin before that.

So the moment you are told the bone has healed is closer to the starting line for using it again. From the very moment the test tells you it has finished its job, the body begins the next one.

Heaviness, not being able to straighten it all the way, a jolt from the slightest touch even though the sensation in that spot is actually dull — if these remain, it is closer to the truth to see it as the sequence still being unfinished, rather than recovery having gone wrong.

Somewhere Else First

Sometimes what remains is not a trace of recovery but something new.

When the pain has moved away from where the injury was. What recovery leaves behind is usually located at the site of the original injury. If a spot that had been fine starts hurting anew, look first for something new happening there. This is especially true if a vertebra has ever collapsed before (a compression fracture).

When you cannot bear force or weight on the injured site, or it looks different in shape. This is different in kind from heaviness or not straightening all the way.

There is somewhere to check first.

I regard the bone healing as only the start of recovery. Recovery extends through the pooled fluid finally draining, the stiffness releasing, the dulled sensation returning, and the arm being used again.

That is why “it has healed” and “it feels like it used to” do not arrive together. The test makes the first statement; the body makes the second while the arm is used again. The remaining sequence passes through the space between those two statements. I continued this discussion in Pain After the Fracture Healed.

Written by Dr. Heo Ji-young (PhD in Korean Medicine Pathology, Kyung Hee University · former Research Professor of Herbology, Kyung Hee University)