Reaction with Na, NaH, or NaOH can be used to irreversibly accomplish the following reaction. 
Definitions:
Contracture
The permanent tightening of muscles, tendons, skin, or other soft tissues that results in decreased mobility and possible deformity at a joint.
Sheaths
Protective coverings or cases that enclose a part or object, such as a blade or a cable.
Extensors
muscles that increase the angle between components of a limb, working to extend or straighten out the limb.
Tissue
Groups of similar cells in an organism that work together to perform specific functions.
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