Often after an acute injury of the knee the quadriceps muscle will not contract, which is called âquad inhibition.â. Inability to straighten the leg. Athletes with acute patellar injuries may find that they cannot flex the knee joint fully or straighten the leg. This may be exacerbated by swelling of the knee.
The alkali metals are a group (column) in the periodic table consisting of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).
The alkali metals are a group of elements in the periodic table. They are all in the first column of the periodic table.The only element in the first column that is not usually considered an alkali metal is hydrogen. Hydrogen and the alkali metals make up the group 1 elements of the periodic table.hey are all in the first column of the periodic table. The only element in the first column that is not usually considered an alkali metal is hydrogen. Hydrogen and the alkali metals make up the group 1 elements of the periodic table.