Arizona Cardinals running back Chris Johnson (23) against the San Francisco 49ers on Nov. 29. The year before, Sports Illustrated reported, he had stem cells from his bone marrow injected into his knee to rebuild cartilage after a torn meniscus.
Arizona Cardinals running back Chris Johnson (23) against the San Francisco 49ers on Nov. 29. The year before, Sports Illustrated reported, he had stem cells from his bone marrow injected into his knee to rebuild cartilage after a torn meniscus. Tony Avelar AP
Arizona Cardinals running back Chris Johnson (23) against the San Francisco 49ers on Nov. 29. The year before, Sports Illustrated reported, he had stem cells from his bone marrow injected into his knee to rebuild cartilage after a torn meniscus. Tony Avelar AP

Stem cell therapy: No longer just for high-paid athletes

March 25, 2016 06:00 AM