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Adult with PFFD - swelling on the knee

Dear Members,
This is Sonia again , As l told before l was born with PFFD and lived for 34 years very happily but 3 years ago l picked up a very heavy parcel and brought upto the stairs. and after that l have sweeling in the knee of normal leg, lt became better after 8 months but after that when l do some activities for example go to shopping and cinema etc... lt again swells :(
and a doctor said me l have primary arthritis , is there any person who has this problem? whats the solution , is there any cure? l like to be an active person like before.
Regards and thank you for any help.