a year later severe back problems

[seb7289]

I think my back problems came from an injury that happened in May of 2008. I work at a college in PA and was taking the trash outside to a dumpster. Next to the dumpster is a grate for water drainage. When I stepped on the grate my foot hit an open spot and caused my ankle to turn, I went down hit my opposite knee and then fell back on my tailbone on the macadam. The college sent me to their doctor. Visual observation showed a badly sprained ankle. I also complained about my hip hurting which they did an exray of but found nothing. At the time my back really didn't feel to bad. I was out of work for a few weeks on workmens comp due to the ankle. The pain in my hip would come and go until recently. The pain has progressed into my buttocks down my leg into the knee and at times into the ankle. One day on my way to work I decided to stop at the emergency room cause the pain had worsened. They concluded that it could be a pinched sciatica. Recently have gone for an mri and waiting results. If it turns out that the pinched nerve could be from the fall in 2008 can the workmens comp case be reopened?