1 Outside of Knee: Pain on the outside of the knee, or lateral side, is commonly caused by lateral meniscus tears, LCL injuries, IT band tendonitis, and arthritis.  Back of Knee: Pain in the back of the knee can be due to the collection of fluid, called a Baker's Cyst.
Definition: The subject of a sentence is the noun, pronoun or noun phrase that precedes and governs the main verb. The subject is the part of the sentence that performs an action or which is associated with the action. He is a really nice guy. * He is the subject of the sentence, controlling the verb and the complement.
Identifying Simple Subjects The simple subject is the noun or pronoun in the complete subject that tells what the sentence is talking about. The other words in the complete subject modify the simple subject. Examples of Simple Subjects - The steep steel ladder has become slippery. [Ladder is the simple subject; the steep steel ladder is the complete subject.] - The woman in blue overalls climbs slowly and carefully.