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