HSS What's the Diagnosis Case 98

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Findings/Diagnosis Distal radial fracture with slight dorsal displacement/prominence at the level of Lister’s tubercle. The extensor pollicis longus tendon demonstrates an intrasubstance partial tear and then becomes completely disrupted at the area of bony irregularity of Lister’s tubercle.

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Discussion As stated previously this case was a distal radial fracture with slight posterior displacement of Lister’s tubercle yielding disruption of the EPL. The EPL is the most common disrupted tendon in the setting of distal radial fracture and is related to friction/and irregularity as the tendon rubs against the irregular margin of the fractured Lister’s tubercle. As the tendon is the sole source of extension of the IP joint of the thumb it frequently necessitates repair or tendon transfer.

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