The most common mistake people make with knee conditions is thinking that pain means the joint space is involved. Most of the common vague knee pain I see involves a really common knee imbalance. This occurs when the muscles of the upper leg (quadriceps) have over development of the lateral part of the quads. That causes the knee cap to track laterally and wear on the lateral part of the boney protuberance of the femur. This wear causes a thinning of the cartilage of the patella (knee cap). It can be very painful especially when squatting, climbing stairs, and walking down hills. Fortunately the correction of this is relatively simple with RIT and corrective strengthening of the medial part of the quad muscles.