[Verse 1]
Snap in the schoolyard, the shinbone splits apart,
Blood rushes to the fracture like it's answering the heart,
Within hours a clot comes rolling, dark and red,
A fibrin bridge gets built where living bone once spread,
Macrophages marching in to sweep away the wreck,
Clearing out the rubble, sending signals down the neck
Of growth factors shouting, "time to start the build,"
Inflammation's noisy, but it's how the gap gets filled.
[Chorus]
Clot it, knit it, harden it, carve it,
Four stages dancing till the break's departed,
Hematoma, soft callus, hard callus, then the carving crew,
Wolff's law whispers: shape the bone for what it's gonna do.
[Verse 2]
Two weeks later, something rubbery appears,
Fibroblasts and cartilage cells erasing all the fears,
A soft callus forming, squishy as a bridge of clay,
Too weak to bear your weight yet, but it holds the gap at bay,
Collagen and chondrocytes are weaving strand by strand,
A fibrocartilage splint, half jelly and half plan,
Flexible and living, like scaffolding of lace,
Waiting for the builders in osteoblast to take their place.
[Verse 3]
Six weeks in, the osteoblasts arrive to do their trade,
Turning rubber into woven bone, a lumpy bridge they've made,
A hard callus on the X-ray, bulging like a knot,
Doctors smile and say "it's healing," though it's not the final shot,
Woven bone is strong but scattered, fibers every way,
It needs a sculptor's patience to be chiseled right one day,
That's when remodeling creeps in, slow across the years,
Osteoclasts chew the extra, osteoblasts stack the tiers.
[Chorus]
Clot it, knit it, harden it, carve it,
Four stages dancing till the break's departed,
Hematoma, soft callus, hard callus, then the carving crew,
Wolff's law whispers: shape the bone for what it's gonna do.
[Bridge]
Pin it rigid, screw it tight, let the two ends kiss,
Primary healing skips the callus, bone just knits like this,
But leave a little wiggle, a little room to sway,
Secondary healing calls the whole callus crew to play,
Children bounce back quickest, their growing bones comply,
A crooked break grows straighter as the seasons wander by.
[Verse 4]
Months turn into seasons, the lamellar lines align,
Stress along the shinbone tells the cells where to design,
Wolff's law is the architect, pressure draws the plan,
Bone remembers running, jumping, holding up a man,
From a fragile crimson clot to a girder straight and sure,
The body's quiet masonry, patient and obscure.
[Chorus]
Clot it, knit it, harden it, carve it,
Four stages dancing till the break's departed,
Hematoma, soft callus, hard callus, then the carving crew,
Wolff's law whispers: shape the bone for what it's gonna do.
[Outro]
Clot, callus soft, callus hard, then carve it clean,
That's the whole parade of healing moving in between,
Bone by bone, the body knows,
Exactly how to mend and grow.