The cartilage masking the ends in the bones allows the bones to glide smoothly from one another with only slight friction. OA causes harm to the cartilage and leads to increased friction — resulting in pain, inflammation, and in the end, a loss of mobility and performance. Embryonic stem cells http://reidfnwzc.actoblog.com/319764/the-single-best-strategy-to-use-for-stem-cell-treatment-for-lower-back-pain