2. A good massage therapist will also be able to figure out whether your shoulder blade knot is being caused by tight muscles in your neck. Those muscles are called the scalenes and they can cause knots in your back near your shoulder blades. 3. Strengthen your back from the base of your head to the back of your thighs. This will help prevent the painful back knots from happening in the first place.
Cf. Rhombus, Rhumb.] 1. (Geom.) An equilateral parallelogram, or quadrilateral figure whose sides are equal and the opposite sides parallel. The angles may be unequal, two being obtuse and two acute, as in the cut, or the angles may be equal, in which case it is usually called a square.
1. A rhombus is a parallelogram with four congruent sides. While the definition states parallelogram, it is sufficient to say:  A quadrilateral is a rhombus if and only if it has four congruent sides., since any quadrilateral with four congruent sides is a parallelogram.