In an open injury during toileting and debridement,muscle viability is detected by -a) Colour of the muscleb) Muscle sizec) Muscle functiond) Muscle contractilitye) Punctate bleeding spots on cut edge
Muscle viability is detected by '4C'

Colour - dead muscle has dark unhealthy colour, has lost its sheen
Contractility - dead muscles does not twitch when held by forceps.
Consistency - dead muscles has lost its turgor and is mushy in consistency.
Capillary bleeding - dead muscle does not bleed at cut ends.

Also remember
Most important step in wound toileting & debridement is excision of dead tissues, that's why better term for toileting & debridement is 'wound excision'.
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