[Verse 1]
Five forces are stalking every skeleton you own,
Pulling, crushing, bending — they're hunting for your bone,
Tension yanks it straight apart, compression stacks the weight,
Torsion gives a twisting shove, shear slides at an angle, straight,
Five ways to load a lever till the calcium gives way.
[Chorus]
Pull it, push it, bend it, twist it, slide it sideways too,
Tension, compression, bending, torsion, shear — that's your cue,
Straight across is bending's work, the spiral's torsion's crime,
Learn the force, you'll know the break, every single time.
[Verse 2]
Bend a stick until it snaps straight across the grain,
That's transverse, a clean horizontal line of pain,
Mix the loads — a twist, a bend, a crush all in one go,
You get oblique, an angled line, the forces cross below.
[Verse 3]
Picture torsion like a key that's turning in a lock,
Spiral fracture wraps the shaft, a corkscrew round the stock,
But if a baby can't yet walk and shows that twisting line,
Ring the alarm, call it abuse — that's never twisting-fine,
A doctor's eye on infant bone must never look away.
[Chorus]
Pull it, push it, bend it, twist it, slide it sideways too,
Tension, compression, bending, torsion, shear — that's your cue,
Straight across is bending's work, the spiral's torsion's crime,
Learn the force, you'll know the break, every single time.
[Verse 4]
Comminuted shatters bone in three bits or more,
Like a window hit by gravel, scattered on the floor,
Avulsion's sneaky — tendon yanks and takes a chip,
A little piece torn loose and free, a bony souvenir in its grip.
[Verse 5]
Kids' bones bend like branches, young and full of spring,
Greenstick cracks one side alone, still holding like a hinge,
Buckle up, it's torus now, it bulges, doesn't split,
Compression folds the cortex in, a wrinkle, not a rift.
[Bridge]
Skin stays closed, we call it simple, quiet underneath,
Skin tears open, call it compound, bone shows through the sheath,
Stress fracture comes from miles run, the same step times a thousand,
Pathologic breaks where sickness hollowed out the bone's foundation.
[Chorus]
Pull it, push it, bend it, twist it, slide it sideways too,
Tension, compression, bending, torsion, shear — that's your cue,
Straight across is bending's work, the spiral's torsion's crime,
Learn the force, you'll know the break, every single time.
[Outro]
Five forces, one skeleton, learn the clues they leave,
Transverse, oblique, spiral, comminuted — read what bones believe,
Greenstick, buckle, open, closed, stress and pathologic call,
Now you know the language bone speaks when it falls.