Your symptoms are suggestive of degenerative arthritis. It is not the gas which gets trapped, but the loose bodies (very tiny concretions) tied up in the joint space. A friction massage dislodge them and decreases the associated muscle spasm and opens up the locked joint. Following measures would be helpful in the knee arthritis;
1) Knee care in the activities of daily living. Few simple self-care measures can be remarkably effective in ending pain cycle.
a) Avoid prolonged standing or walking or sitting with joint in a single position.
b) whenever you sit, keep the knee stretched and fold them intermittently.
c) Squatting, sitting cross legged should not be done.
d) Avoid climbing stairs.
e) Avoid sitting legs unsupported or hanging. f) Reduce weight if over weight/obese.
2) Rest: Taking a break from your normal activities reduces repetitive strain on your knee, gives the time to heal and helps prevent further damage.
3) Anti-inflammatory medications
4) Physical therapy; the goal of physical therapy is to strengthen the muscles around your knee and help you regain knee stability. Ideal is supervised physical therapy. Stretching exercises are also part of the physical therapy regime.
5) Orthotics and bracing.
6) Glucosamine and chondroitin orally for about 1-2 years and a trial of diacerin for three months.
7) Hyaluronic acid injections in knee.
8) Local analgesic sprays and ointments to your skin may help relieve the pain and stiffness of osteoarthritis.
9) Deep Electrotherapy by physical therapist.
These are the exercise resources for the knee. You can pick the exercises which suits you;
The shoulder joint and jaw too would respond to steroid shots and physical therapy.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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