In the case of a 39-year-old auto mechanic with slight knee instability but no atrophy, what is the permanent disability percentage?

• A. 12%
• B. 19%
• C. 22%
• D. 25%

Answer: (C)

For a 39-year-old auto mechanic with slight knee instability but no atrophy, the determination of a permanent disability percentage takes into account the impact of the knee condition on work capacity and daily activities. In this scenario, slight knee instability indicates that there is some level of impairment, but the absence of atrophy suggests that muscle strength and functional ability are largely preserved.

In many jurisdictions, disability ratings for knee conditions can be based on standardized medical guidelines or tables that assign percentages based on the severity of the disorder and its impact on mobility. A permanent disability percentage of 22% likely reflects a moderate impairment that could affect the mechanic's ability to perform tasks that require bending, kneeling, or prolonged standing, while still allowing for a reasonable level of productivity in their trade.

The assigned percentage also considers that the mechanic, while facing some instability, does not have additional complications such as pain, significant loss of motion, or muscle weakness. This balance results in a higher rating than a lower percentage, acknowledging the presence of instability, while not reaching a level that would necessitate a more severe rating due to more debilitating conditions. Thus, the 22% rating is appropriate given these factors, aligning with typical evaluations of similar cases.