Steady & sustained traction on shortened ms & ligs may succeed in lengthening these structures without traumatizing them.
Any passive stretching of a ms beyond the middle range will elicit a reflex contraction known as the myotatic, or stretch reflex- which will protect the underlying fibrous structures frm strain.
If however the stretching is steady n prolonged, the muscles relaxes & the fibrous structures takes the strain.
The collagenous fibers of which these structures are composed are strong, inelastic & inextensible in response to an intermittent & moderate degree of tension,-but give way & elongate when submitted to prolonged strain.
Mechanical means such as a turnbuckle plaster, balanced traction and splintage are egs of sustained passive stretching, but more temp methods such as head & limb traction or manual stretching prove effective.