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The Journal of Bone and Joint Surgery (American) 84:822-832 (2002)
© 2002 The Journal of Bone and Joint Surgery, Inc.


Current Concepts Review

Muscle Injuries and Repair: Current Trends in Research

Johnny Huard, PhD, Yong Li, PhD, MD and Freddie H. Fu, MD

Investigation performed at the Growth and Development Laboratory, Children's Hospital of Pittsburgh; the University of Pittsburgh; and the Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania

Johnny Huard, PhD
Yong Li, PhD, MD
Growth and Development Laboratory, Children's Hospital of Pittsburgh, 4151 Rangos Research Center, 3705 Fifth Avenue, Pittsburgh, PA 15213. E-mail address for J. Huard: jhuard+@pitt.edu

Freddie H. Fu, MD
Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Liliane S. Kaufmann Building, 3471 Fifth Avenue, Suite 1010, Pittsburgh, PA 15213

In support of the research or preparation of this manuscript, one of the authors (J.H.) received grants from the National Institutes of Health (NIH 1 RO1 AR47973-01) and the Orris C. Hirtzel and Beatrice Dewey Hirtzel Memorial Foundation. This work also was supported by the William F. and Jean W. Donaldson Chair at Children's Hospital of Pittsburgh. The authors did not receive payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.


    Introduction
 
After injury, muscle healing occurs through different phases, including (1) degeneration and inflammation, (2) muscle regeneration, and (3) development of fibrosis.

The severity and type of muscle injury influence the healing process.

Enhancement of muscle regeneration and prevention of muscle fibrosis can improve muscle healing.

Growth factors, including basic fibroblast growth factor (bFGF), insulin-like growth factor-1 (IGF-1), and nerve growth factor (NGF), can improve muscle regeneration, but the post-injury healing process remains incomplete.

The use of anti-fibrosis agents that antagonize the effect of transforming growth factor-ß1 (TGF-ß1) can prevent fibrosis and improve muscle healing, resulting in nearly complete recovery.

Optimal muscle recovery may require the use of novel technologies, such as gene therapy and tissue engineering, to achieve both high levels and long-term persistence of these growth factors and cytokines within the injured muscle.

Muscle injury presents a challenging problem in traumatology, as injured muscles heal very slowly and often . . . [Full Text of this Article]


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