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| Pathologic stages: |
| Stage I: temporary irritation (chemical inflammation?) |
| Stage II: permanent tendinosis – less than 50% tendon cross-section |
| Stage III: permanent tendinosis – greater than 50% tendon cross-section |
| Stage IV: partial or total rupture of tendon |
| Phases of pain: |
| Phase I: mild pain after exercise activity, <24 hours |
| Phase II: pain after exercise activity, >48 hours, resolves with warm-up |
| Phase III: pain with exercise activity, does not alter activity |
| Phase IV: pain with exercise activity that alters activity |
| Phase V: pain caused by heavy activities of daily living |
| Phase VI: intermittent pain at rest that does not disturb sleep; pain caused by light activities of daily living |
| Phase VII: constant rest pain and pain that disturb sleep |