introduction: assessing quality of life for patients with shoulder instability may be essential because of the negative impacts of the disease on patient’s life. the aim of the present study, therefore,  was  to  assess  the  internal  validity  and  consistency,  test-retest  reliability,  and convergent validity of the persian version of the oxford shoulder instability score (osis). material ...

In a few recent papers (Woltjer," 2 Chandrasekhar3) a beginning has been made with a variational formulation of the problems of hydromagnetic equilibrium. A similar approach was followed by Kruskal and Kulsrud4 who examined the static equilibrium in a toroid from the variational point of view, making largely use of topological arguments. It seems somewhat doubtful whether this approach can be g...