Lateral Slip Exam

  • The lateral slips are small tendinous components of the extensor mechanism at the PIP joint.
  • The lateral slips are too small to exam as isolated structures but are part of the interrelated PIP and DIP extensor mechanism.
  • At surgery the lateral slips maybe visible with magnification as part of the extensor mechanism at the dorsal PIP joint.
Diagrams & Photos
  • Note the lateral slips (yellow).
    Note the lateral slips (yellow).
Key Points
  • The lateral slips are important because they transfer extension forces from the EDC to the terminal extensor tendon of the finger. 
  • The lateral slips also actively support the positioning of the conjoined lateral bands dorsal to the PIP joint axis of motion.
Grading of Muscle Strength
Exam References
Anatomic Abbreviations
Hand Surgery Resource Exams & Signs Library