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You should ask whoever diagnosed you. They'd be the best person for advice.
Hope you heal quickly.
I developed quadricep tendonitis a year ago and still have it!
Whatever you do don't go through the pain or it gets worse and worse. Mine has developed into knee pain now as the quad muscles are too weak to support the knee cap tracking, disastrous.
I think cycling is ok but you have to do it on a low resistance so that you don't put too much pressure through the tendon.
How did you get quadriceps tendonitis?
Is it pain on the inside of the knee or the outside? Mine is on the inside of my left knee and now the muscle is really wasted. I have now been limited to straight leg raises as all the other rehab exercises make it worse.
Ice and heat one after the other is a good idea (always ending with ice) as it increases the blood flow even more to the tendon. Tendon's are harder to heal compared to muscle as they have less blood supply. Also cross friction massage is recommended to break up the scar tissue forming in the tendon. I haven't had any of this yet but I will be making a physio appointment in london to see someone with lots of experience as the nhs physios aren't helping me.
Also you can get stronger anti inflams if you haven't already, voltarol was helping me until it started to give me stomach ache.
Yeah rest is good, its taken me a long time to put this into practice
Did you have your knee surgeries done on the nhs or private? I hear lots of stories of people being worse after surgery, did you find yours ok?