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).
Alkali metals are from Group 1 of the Periodic table and have a single electron in their outer shell.Alkaline-Earth metals are in group 2 of the periodic table and have 2 electrons in their outer shell.he alkali metals are a common family of elements found in group 1 of the periodic table. This group consists of the metals, Lithium(Li), Sodium(Na), Potassium(K), Rubidium(Rb â¦), Caesium(Cs), Francium(Fr).