Related Clues:

• Place to play horsey
• Common arthritis site
• Place for a pad, maybe
• Patella place
• ACL's locale
• Midleg joint
• Proposer's prop?
• Worn spot on Levis
• Kind of a jerk?
• Down with what the kids are into these days
• Arthroscopic surgery site
• Guitar support
• Word with ''jerk'' or ''slapper''
• ''Your ___ bone's connected to your thigh . . .''
• ___ pants