mechanical instability


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mechanical instability

A measurable alteration of joint opening due to disruption of one or more of the joint’s mechanical stabilisers (e.g., the capsule, tendons, muscles or bones).

mechanical instability

Orthopedics Instability where injury to a joint results in pathological laxity. See Instability. Cf Functional instability.
References in periodicals archive ?
Early degradation of the screws leads to mechanical instability resulting in nonunion and osteolysis of the three carpal bones.
Inclusion criteria were: (1) experience of at least one unilateral acute ankle sprain without fracture which resulted in pain, swelling, and temporary use of crutches (but not in the past 3 months) [5,21]; (2) at least two episodes of the ankle "giving way" in the past 6 months [5,11]; (3) no participation in the rehabilitation program at the time of study [5,7,11,21]; and (4) no evidence of mechanical instability [25] as evaluated by an orthopaedist using anterior drawer test or talar tilt test [3].
Mechanical instability is the increase in accessory movement (arthrokinematic motion that cannot voluntarily be produced, e.g.
Functional rehabilitation has a high probability of success in functional ankle instability; however, the likelihood of success is decreased with mechanical instability, peroneal weakness, or proprioceptive deficits.
However, the utility of PLOT columns has been significantly limited by the mechanical instability of the particle layers.
Smaller oscillations within 0.5 um can be explained by temperature oscillation and large negative trend by mechanical instability.
Mechanical instability can cause pain in the bones, joints, muscles, or ligaments.
"This is a convincing demonstration of a most unusual application of mechanical instability in plants," adds Charles R.
Garn and Newton (1988) suggested an impairment in postural sway may also occur consequent to any mechanical instability of the joint caused by joint malalignment, or neuromuscular factors other than proprioception as suggested by findings of Friden et al (1989).
The instrument he used had crystal spectrometers of unnecessarily high wavelength resolution and inherent mechanical instability. His Geiger detectors had a very high dead time (in the order of ins) so that no high intensities could be accurately measured.
Ongoing mechanical instability may be a cause of pain in spinal cord injury.
(19) Most common symptom of chronic dislocation of DRUJ would be pain in the wrist often associated with symptoms of mechanical instability, including weakness and a joint clunk.

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