Table 1

 Modified Nirschl score

Phase 1 – Mild pain with exercise, resolves within 24 h
Phase 2 – Pain with exercise, exceeds 48 h
Phase 3 – Pain with exercise, does not alter activity
Phase 4 – Pain with exercise, alters activity
Phase 5 – Pain with heavy activities of daily living
Phase 6 – Pain with light activities of daily living, intermittent pain at rest
Phase 7 – Constant pain at rest, disrupts sleep