LIMITED REPAIR TISSUES. “In addition, bone tissue has limited repair potential in that new bone is formed from mesenchymal stem cells located in the bone marrow to repair a break or fracture. Tendons and ligaments also undergo limited regenerative healing. Other tissues of the limb, such as the skin, are less successful in their response to injury and heal imperfectly.”
http://onlinelibrary.wiley.com/doi/10.1002/ar.b.20082/full