Sorry for the delay in response ..
A single joint arthritis is a well known problem though things like gout do need to be ruled out in such cases..
Have your uric acid levels been tested?
If the levels are abnormal then meds to reduce this will help, otherwise treatment will depend on the actual symptoms, x rays and further tests as indicated ..
painkillers and cortizone and sometimes the use of disease modifying drugs (like methotrexate etc.) would help in treating this your condition ...
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Regards
Dr. Gupta