Patello femoral dyfunction and pain are most commonly referred events from L3.
Percieving this problem as the sequelae of complex local knee biomechanics is just time wasting and certainly frustrating. Restoring normal movements to L3 Wikipedia reference-linkfacet joints with Continuous Mobilsation , will quickly elimininate every feature of this problem , in one to three treatments ( with no attention to the knee at all ). See Rehabedge under manual therapies section for more on Continuous Mobilisation . PFS is a referred problem from the lumbar spine, what you need is a physiotherapist who is trained in spinal facet joint mobilisation, the best are usually Kiwi, Aussie or Canadian. Good luck.