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.
Best Answer: The subject is the main object in the picture, the subject matter is the topic or context of the picture. If it is a landscape, it is the landscape itself. If it is a portrait, it is the person in the portrait. If it is a group of people playing a sport, it is the game. The subject matter is what you choose to focus on for the picture.