I’ve had sore knees because of patello-femoral syndrome. I’m unable to go down stairs or kneel.

Patello-femoral syndrome is characterized by an irritation of the cartilage in the knee joint, between the femur (thigh bone) and the patella (knee cap). Though it usually occurs when the joint is overused, it can also be the result of a poor alignment of the patella and the femur.

To reduce irritation of the cartilage, avoid major impacts on the joints (e.g. jogging) and repetitive movements.

A lack of water (dehydration) can also render the cartilage more fragile, so it is generally recommended that people drink at least two litres of water a day. 

A.Vogel Stinging Nettle is an excellent supplement for improving cartilage: it helps the kidneys eliminate acids that can irritate and damage it. It also contains a lot of silica, a mineral that fortifies cartilage and makes it less brittle. Its effect is gradual, but it’s a deep-acting supplement which helps strengthen joints in the long run. Until the Stinging Nettle takes full effect, the anti-inflammatory action of A.Vogel Joint Pain Relief will help control your pain. 

You should consult an osteopath or physiotherapist, who can use manipulations and exercises to help correct the alignment of the joint.