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.
Arthritis of the knee may cause periodic inflammation. This can be due to the formation of bone spurs (osteophytes) or extra fluids in the knee. Swelling may be more pronounced after a long period of inactivity, like when you first wake up in the morning. The skin on your knee may look red or feel warm to the touch.