Answer :

Final answer:

The rankings of grade 5 and 4-0 are used to assess the range of motion and strength of the shoulder joint during extension.

Explanation:

When grading shoulder extension, the rankings of grade 5 and 4-0 are used to assess the range of motion and strength of the shoulder joint. Grade 5 represents normal range of motion and full strength, indicating that the student can smoothly and fully extend their shoulder without any resistance or pain. On the other hand, 4-0 represents limited range of motion and decreased strength, indicating that the student may have difficulty extending the shoulder or may experience pain or weakness during the movement.

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