Flexion @ Extension

[jazyj]

Can any one tell me what is flexion limited to 30 deg means,

also what extension limited to 20 deg specially when your leg is at 0 degrees when straight, how can you extend it any more?

[Vync]

These are measurements of range of motion

Flexion = bending a joint/limb/extremity toward your body (like your bicep when showing off or back when bending forward)

Extension = bending a joint/limb/extremity extremity away from your body (like straightening out your arm or bending backward)

The are supposed to measure it properly with a goinometer (like a ruler/protractor, but to measure angles in degrees), but don't always do that.

Extension limited to 20 deg when leg is at 0 degrees straight sounds like they are referring to your back, like when standing and trying to bend it backwards