Impairment evaluations not performed following processes defined in the AMA Guides to the Evaluation of Permanent Impairment (AMA Guides) usually result in erroneous ratings. Common lower extremity impairment rating (IR) errors include using the diagnosis-based approach for more than one diagnosis within a region, and incorrectly assessing gait abnormalities, motion loss, nerve injuries, and complex regional pain syndrome. Rigorous adherence to the AMA Guides methodology and recognition of common IR errors can prevent the promulgation of erroneous impairment ratings.

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