MassLive reports Williams has an artery condition in both of his legs, although it is reported to be "not too serious."
The condition, known as popliteal artery entrapment syndrome, or PAES, is most commonly found in athletes and can lead to "cramping and calf pain during exercise," says Johns Hopkins Medicine. Essentially, the condition is diagnosed when the muscles and tendons in an individual's knee restrict the pop
According to the report, NBA teams, as well as Texas A&M, where Williams went to college, were all aware of the condition, which means the Celtics were comfortable enough with the diagnosis to select the center.
Williams has sat out two of the Celtics' three NBA Summer League games thus far with a left knee contusion and told reporters he has been dealing with left knee tendinitis since last year.
The former Aggie was widely considered a lottery-caliber talent, but fell to the Celtics at No. 27 due to concerns about his makeup.