NAVLE Integumentary

Canine Skin Laceration Study Guide

Skin lacerations from acute trauma represent one of the most common emergency presentations in canine practice.

Overview and Clinical Importance

Skin lacerations from acute trauma represent one of the most common emergency presentations in canine practice. A laceration is defined as a wound with torn or jagged edges resulting from blunt or sharp trauma that disrupts the continuity of skin and potentially deeper tissues. Understanding proper wound assessment, classification, and management principles is essential for successful outcomes and is frequently tested on the NAVLE.

Traumatic wounds in dogs may result from motor vehicle accidents, bite wounds, sharp objects (barbed wire, glass, metal), falls, and other external forces. The severity of injury is frequently underestimated initially, as extensive damage to underlying tissues can occur even with minimal visible skin involvement.

Wound Type Characteristics Clinical Considerations
Laceration Sharp or jagged edges; linear or irregular; minimal tissue necrosis Often suitable for primary closure if clean and recent
Avulsion Tissue pulled free from attachments; tensile forces; variable damage Assess viability; may require extensive debridement
Degloving/Shearing Obliquely directed forces; high friction (motor vehicle); severe injury High infection risk; often requires reconstructive surgery
Puncture/Bite Small surface wounds; extensive underlying damage; dead space 'Tip of iceberg' - always explore; never close primarily

Wound Types and Etiology

Class Description SSI Risk
I: Clean No inflammation; sterile technique; GI/GU/respiratory tracts not entered 1-5%
II: Clean-Contaminated Controlled entry into GI/GU/respiratory; wounds less than 6 hours old with minimal contamination 3-11%
III: Contaminated Major break in sterile technique; fresh traumatic wounds 6-12 hours old; acute non-purulent inflammation 10-17%
IV: Dirty/Infected Established infection; devitalized tissue; wounds greater than 12 hours old; purulent material Greater than 27%

Wound Classification System

The CDC Surgical Wound Classification System categorizes wounds into four classes based on contamination level:

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