Word of caution:
my experience was similar to yours up to this point. I started to have minor urinary restriction approximately one week after SpaceOAR injection. It may have been the SpaceOAR or the marker placements... combination of Biopsy and one or both of these procedures. Bottom line we put our Prostate through a lot of prodding, probing, injections, biopsy snips and finally radiation beam exposures. This can cause inflammation which can restrict your normal urination flow. I was told to try anti-inflammatory, this helped a bit. Some are put on Flo-Max. This relaxes the muscles permitting greater flow. Research shows that these symptoms often disappear spontaneously after 3 months from last radiation treatment. The restriction can actually continue to get worse a week or two after last radiation treatment.

Hopefully you will avoid this issue. Regardless it is a temporary inconvenience... for most.

Best wishes!