Evidence is insufficient because of: 1  The limited number or size of studies. 2  Important flaws in study design or methods. 3  Inconsistency of findings across individual studies. 4  Gaps in the chain of evidence. 5  Findings not generalizable to routine primary care practice. 6  Lack of information on important health outcomes.
Definition of jerk for English Language Learners. : 1  a stupid person or a person who is not well-liked or who treats other people badly. : 2  a quick pull or twist. : 3  a sudden sharp movement.
The muscle jerks, being new, means a trip to the doc. This can be a side effect of a medication or a new problem. If med related and not treated right away it can be permanent. If new, same thing. Since you have more than your share of spine and pain problems, please don't hesitate to get this checked soon.