When was the last time you had your serum uric acid levels assessed?
What scan was done? an Xray scan or a an ultrasound?
Is your gout well controlled?
Are you taking any medications at this point?
Aside from the scans and urinalysis ,you may need to have some blood work done. Your serum BUN and Creatinine levels may need to be determined.As well as a 24 hour urine collection for urinary uric acid may be needed.
Although a urinary tract stone needs to be ruled out here.Another differential is that, what you are experiencing may be referred pain from painful or inflammed soft tissues. Musculoskeletal pain that is not secondary to gout should also be considered. A spine disorder may also present as pain during strenuous activities.