Hello Sir,
Your PSA level of 1.5 is normal, and you have never been diagnosed with prostate cancer. If you have had a prostate biopsy, that would be the gold standard, but if you have a lesion on your femur it could be a primary cause of something else(primary bone tumor) Having prostate metastatic disease to the bone would also cause higher PSA levels, there are a few patients with low PSA who do have prostate cancer, but digital rectal examination would generally provide some type of indication of this. For you, the best option to rule out the prostate as being the primary source would be a biopsy. However at this time, it is unlikely that you have metastatic disease to the bone.
Thanks!