A sudden onset (with no predisposition) a monarticular (single joint), arthritis is one of the possibility. A combination of bursitis and tendonitis are the other possibilities of the diagnosis. Ideally an MRI should be done which delineates the joint as well as the soft tissues around it. So exact ailment can be ascertained. Blood work like rheumatoid factor, C-reactive protein, serum uric acid also would be recommended for the ascertainment of the cause.. Following treatment would be advised;
1) Physical therapy
3) Deep electrotherapy; electrical stimulation, therapeutic ultrasound, short wave diathermy etc.
4) Narcotic analgesics as you cannot take NSAIDs.
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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