Possible Clues:

• Knee part oft-cited on ESPN
• Oft-injured knee part, briefly
• Knee rehab target, for short
• Concern of an orthopedic M.D
• Common place for a sports injury, for short
• Site of many a season-ending injury, briefly
• Torn ___ (athlete's knee injury)
• Target of an athlete's M.R.I
• Often-injured part of the knee, for short
• Common spot for knee injuries, briefly