CRIPPLED FOX SOLDIERS ON!
COURAGEOUS Michael J. Fox is struggling to walk amid his increasingly difficult battle with Parkinson’s disease. But the ailing 60-year-old is forging ahead — despite not believing a cure for the crippling condition will happen in his lifetime. The “Back to the Future” star reveals “every step is now like a frigging math problem,” after enduring three decades with the nerve disease and the devastating effects of spinal surgery. His ordeal was driven home in stark reality as he used a cane to navigate a Los Angeles sidewalk March 18. “There is no way to put a shine on my circumstance,” he bluntly explains. Though he’s raised more than $1 billion for research to stamp out Parkinson’s through his Michael J. Fox Foundation, the actor admits he likely won’t see the defeat of the…