- See:
Extensor Mechanism of Fingers
- Discussion:
- two lateral bands arise from the sides of the
EDC just proximal to the PIP;
-
interossei supplement the lateral bands on both sides of the digit;
-
lumbricals supplement lateral bands on radial side of the digit;
- lateral bands travel on either side of proximal phalanx, and continue around the
lateral aspect of PIP joints and finally both slips join together in a triangular
aponeurosis to form the extensor tendon to the digital phalanx;
- lateral bands are held in place over the PIP by the
transverse retinacular ligament;
- Lateral Band Tightness:
- may be caused by any mass on lateral side of digit (osteophyte, tumor);
-
management:
- distal transection of the lateral bands (and their oblique fibers are transected);
- care is taken to preserve the transverse fibers;
