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).
Noun. 1. alkali metal-any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium); the hydroxides of the alkali metals are strongly alkaline. alkaline metal.