It’s a quiet morning. You lace up your shoes, step outside and begin a brisk morning stroll. But as you take those first few steps, there it is, a faint grinding noise, almost like the crunch of gravel underfoot, except … the sound is coming from your knee!
Thinking back, you recall noticing a similar sound as you were walking up the stairs last week. You pause, do some quick stretches and continue walking. But the grinding sound quickly returns.
