Do your knees “crack and grind” when squatting or using stairs
The patellofemoral joint is part of your knee involving the knee cap (patella) and the thigh bone (femur). The patella sits inside a grooved surface on the distal end of the femur. The patella should glide up and down in this groove smoothly, but can sometimes be misaligned and caused maltracking. The quadriceps muscle holds the patella and helps control the movement in the groove.