The extensor retinaculum septum forming the second extensor compartment contains the ECRL and ECRB tendons. This septum must be released in second compartment intersection syndrome and in de Quervain surgery to avoid inadvertent second compartment decompression.
Maintains ECRL and ECRB within the second extensor compartment; resists tendon subluxation; contributes to the retinacular pulleys at the wrist.
The retinacular septa dividing the extensor compartments are the key structures in compartment-specific wrist surgery. Inadvertent extension of first compartment release into the second compartment may produce ECRL/ECRB subluxation. Proper identification of the septa prevents over-release in de Quervain surgery.
Friction bursitis between the first and second extensor compartments at the proximal wrist producing pain and crepitus with thumb movement 4-6 cm proximal to Lister's tubercle, managed with injection and activity modification.
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