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Monday, August 28, 2017

What is the Difference between Spasticity and Rigidity

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Whilst both spasticity and rigidity describe conditions in which one finds difficulty performing muscular motions, the difference between them arises in how such difficulty is brought about. Both describe forms of hypertonic states affecting an individual’s muscles, joints, and limbs, but a differentiation between the two must be acquired to best achieve a proper diagnosis.

Spasticity vs. Rigidity

Spasticity is often uni-directional, meaning that resistance to movement is only felt when one’s joint or muscle moves in one specific direction. Spasticity is velocity-dependent, meaning that the faster one moves or straightens a joint, the more resistant, tight, or spastic the muscle feels. This can be mild, and only apparent during bouts of strenuous physical activity, or it can be chronic or persistent, causing serious hindrance to one’s movements in moderate to severe cases.
Rigidity is different from spasticity in that resistance to movement in joints is felt regardless of the speed or direction the joint is moving. Rigidity is bi-directional, meaning that one may experience resistance to movements regardless of which direction the joint and muscles are moving in. Muscles that have rigidity feel heavy and like “a lead pipe” when they are moved passively.
The video below will help you to ascertain a clearer understanding between the two.

Characteristics & Causes of Spasticity

Characteristic Features

  • Clasp-knife phenomenon: The limb experiencing spasticity suddenly gives way after an initial resistance to movement. Much like how a clasp-knife slightly resists before folding in. This can be caused by over-stretching the joint or muscles (during initial movement), the inverse stretch reflex (during sustained movements), and eventually contractures (a condition wherein muscles shorten/harden).
  • Stroking effect: One may experience relief from episodes of spasticity by stroking the affected muscle’s surface, although this will likely not provide relief from contracture.
  • Distribution: The sensation of spasticity is distributed differentially, often affecting antigravity muscles (muscles which are the extensors of the back, hips, and knees, which help to maintain proper posture by resisting the pull of gravity).


Knowing the causes of these medical terms can be very helpful when comparing spasticity vs. rigidity. Spasticity is generally caused by damage or trauma to the portion of the spinal cord or brain which controls voluntary movement, namely the corticospinal tract. This can lead to an imbalance and ‘disconnection’ between the muscles and the nervous system. This can be caused by the following instances:
  • Adrenoleukodystrophy
  • Amyotrophic lateral sclerosis
  • Brain damage resulting from insufficient oxygen
  • Encephalitis
  • Meningitis
  • Phenylketonuria
  • Spinal cord injury
  • Stroke
  • Traumatic brain injury

Characteristics & Causes of Rigidity

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