Knee pain, (Runners Knee, Chondramalcia Patella, Patella Femoral Syndrome) can be a slightly more confusing issue with more variables than some other things we treat.
There are many reasons one can have knee pain, some respond better than others to treatment.
Knee rotation is critical to the normal pronation, supination process that takes place when we walk. If we have issues with pronation or supination being altered by differing mechanical aberations, the result will be a good dose of knee pain.
The design of the Femur bone includes two pivot points on either side of the joint, the pivot points are different sizes so, the medial and lateral aspects of the knee, accelerate at different rates through their normal range of motion. The different sizes of the femoral condyles (pivot points) cause the motion responsible for pronation and supination so we must do out best to allow normal knee rotation or we may induce foot, hip, or low back pain.
Any joint in the kinetic chain that isn't doing its job, will run the risk of adversely effecting the joints above and below the problem.
This fact is how Orthotics can have a positive impact on such a wide variety of conditions throughout the leg and low back.