1) Bump on a leg 2) Football pad beneficiary 3) Joint protector 4) Kneepan 5) Leg joint protector 6) Os sesamoideum 7) Patella 8) Prayer foundation 9) Sesamoid bone 10) Shinbone neighbor 11) Start of the strike zone 12) What a pad might protect Found on https://www.crosswordclues.com/clue/kneecap
Kneecap: The medical name for the kneecap is the patella. Whichever name -- kneecap or patella -- you prefer, it is the small bone that is in the front of the knee. The patella is a sesamoid bone, a little bone that is embedded in a joint capsule or tendon, in this case the tendon of insertion of the quadriceps muscle (the 'quad'). The patella in a... Found on http://www.medterms.com/script/main/art.asp?articlekey=8868
verb shoot in the kneecap, often done by terrorist groups as a warning; `They kneecapped the industrialist` Found on https://www.encyclo.co.uk/local/20974