Understanding Sport Risk Levels
Sports are classified by ACL stress level. This affects return timelines and re-injury risk:
Level I (Highest Risk)
Sports with jumping, cutting, pivoting, and quick direction changes.
- Soccer
- Basketball
- Football
- Skiing
- Lacrosse
- Tennis/Racquet sports
Typical RTS: 9-12+ months
Level II (Moderate Risk)
Sports with lateral movements but less cutting/pivoting.
- Baseball/Softball
- CrossFit
- Weightlifting
- Ice Hockey
- Martial Arts
Typical RTS: 6-9+ months
Level III (Lower Risk)
Sports with primarily straight-line movement.
- Running/Jogging
- Cycling
- Swimming
- Rowing
- Golf
Typical RTS: 4-6+ months
Sport-Specific Guides
Soccer
Cutting progressions, FIFA 11+ prevention, return to team training protocol.
Level IBasketball
Jump training, landing mechanics, court movement progressions.
Level ISkiing
On-snow progressions, equipment considerations, seasonal timing.
Level IDistance Running
Marathon training, trail running, speed work progressions.
Level IIICrossFit
Olympic lifting return, WOD modifications, gymnastics progressions.
Level IIUniversal Return-to-Sport Principles
Criteria-Based, Not Time-Based
Modern ACL rehabilitation emphasizes meeting objective criteria rather than just waiting a set number of months. Time allows the graft to heal, but criteria confirm you're ready to use it.
Standard Return-to-Sport Criteria
- Quad strength: ≥90% Limb Symmetry Index (LSI)
- Hamstring strength: ≥90% LSI
- Hop tests: ≥90% LSI on battery of tests
- Psychological readiness: ACL-RSI ≥70
- Movement quality: Excellent landing mechanics, no valgus
- Sport-specific testing: Pass agility and sport-specific tests
- No symptoms: No pain, swelling, or instability