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APL and EPB tendons
ECRL and ECRB tendons
APL and ECRB tendons
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The clinical scenario is consistent with intersection syndrome, a inflammatory response to overuse at the site of the second dorsal compartment crossing under the first dorsal compartment approximately 5 cm proximal to the wrist. An anatomical depiction is provided in illustration A. Injections of the second dorsal compartment, which includes ECRL and ECRB, may relieve symptoms and quell inflammation. Intersection must be differentiated from DeQuervain's syndrome, which is tenosynovitis of the first dorsal compartment. Injections of the first dorsal compartment, which includes APL and EPB, are part of the treatment algorithm for Dequervain's. Wood et al summarizes the evaluation and treatment of sports-related wrist injuries. Grundberg et al demonstrates the pathologic abnormality of intersection syndrome is stenosing tenosynovitis of the second compartment explaining the rationale behind steroid injections into the sheath.
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