US Constitution the words slave or slavery do not appear in the constitution yet they are certainly referred to it.   1. The 3/5 clause which says that an enslaved person will only count as 3/5 of a person in the census. 2. ban on middle passage slave trade.
Medial compartment arthritis (usually osteoarthiritis) can cause pain on the inner side of the knee. This is usually more of an ache than a sharp catching pain and is present when you walk on the leg. As the arthritis worsens the pain can become continuous and interfere with sleep.
Anterior knee pain. Knee pain felt at the front of the knee, around the kneecap, is called anterior knee pain or patellofemoral pain syndrome. It's not always obvious why this pain develops, but it's been linked to previous injuries, overuse of your knees, muscle weakness and your kneecap being slightly out of place.