| ABSTRACT | One
of the most important advances in the promotion of musculoskeletal healing has
come from understanding that treatment of injuries with prolonged rest may delay
recovery and adversely affect normal tissues and that controlled early resumption
of activity can promote restoration of function. Experimental studies of the past
several decades confirm and help explain the deleterious effects of prolonged
rest and the beneficial effects of activity on the musculoskeletal tissues. They
have shown that maintenance of structure and composition of normal bone, tendon
and ligament, articular cartilage and muscle, requires repetitive use and that
changes in the patterns of tissue loading can strengthen or weaken normal tissues.
Although all the musculoskeletal tissues can respond to repetitive loading, they
vary in the magnitude and type of response to specific patterns of activity. Furthermore,
their responsiveness may decline with increasing age. Skeletal muscle and bone
demonstrate the most apparent response to changes in activity in individuals of
any age. Cartilage and dense fibrous tissues also can respond to loading, but
the responses are more difficult to measure. The effects of loading on healing
tissues have been studied less extensively but the available evidence indicates
that repair and remodeling tissues respond to loading and that, like immature
normal tissues, repair tissues may be more sensitive to cyclic loading and motion
than mature normal tissues. Early motion and loading of injured tissues is not
without risks, however. Excessive or premature loading and motion of repair tissue
can inhibit or stop healing. Unfortunately, the optimal methods for facilitating
healing by early application of loading and motion have not been defined. Nonetheless,
experimental studies and newer clinical investigations document the benefits of
early controlled loading and motion in the treatment of musculoskeletal injuries,
and show that optimal restoration of musculoskeletal function following injury
or surgery requires early controlled activity. Author. |