Usually the vastus medialis oblique muscle (the VMO on the inside of the knee) will be small and weak on the side of the knee pain, and this muscle is responsible for maintaining some medial glide of the patella during functional activities. If the VMO is weak, the patella tracks laterally which can lead to pain, compression and even subluxation/dislocation. The VMO is also inhibited immediately with the onset of knee pain, so patello-femoral joint symptoms can occur some time after an acute knee injury that was initially unrelated to the patello-femoral joint.
A conservative treatment plan often relieves symptoms. In the early stages of a knee flare up, rest, ice, activity modification and pharmaceutical medication (non-steroidal anti-inflammatories) may be recommended. Treatment of patello-femoral joint pain includes patella taping, appropriate stretches and strengthening exercises to correct lower limb muscle imbalances, orthotics if indicated, and localised patella mobilisations to stretch the tight lateral tissues (including the ITB). This treatment approach is often referred to as the McConnell’s treatment regime. Sometimes there is an associated hip weakness or hip tightness on the same side which allows the leg to internally rotate too much during activity which places stress on the knee and results in patello-femoral pain. Your physiotherapist will also check your hip biomechanics and mobilise the hip if required and give you appropriate strengthening exercises to improve your general biomechanics.
The Evidence suggests that early intervention may contribute to reducing the recovery duration timeframe. Collins etal, found that participants can receive a favourable improvement within 3 months.
People with PFPS who exercise have a reduction in pain, in the short-term and long-term outcomes at rest and during activity for pain ratings.
A Cochrane review article by van der Heijden RA etal concluded that when comparing those who do not exercise versus those who do, the outcome for patients who do exercise, generally show a reduction in pain in the short-term and long-term.