Return to Sport Post ACL Injury: General Issues

Guidelines and testing for safe return to sports and activities.

Beyond Time-Based Criteria

Modern return-to-sport guidelines have moved away from strictly time-based criteria toward a comprehensive assessment approach. Most experts now recommend that athletes:

  • Wait a minimum of 9-12 months after surgery (biological healing time)
  • Pass a battery of functional and strength tests
  • Demonstrate sport-specific competence
  • Show psychological readiness

Strength and Symmetry Testing

Objective measurements help assess readiness:

  • Strength testing: Typically aiming for ≥90% strength in the surgical leg compared to the uninjured leg
  • Common assessments:
    • Isokinetic testing of quadriceps and hamstrings
    • Hand-held dynamometer measurements
    • Hamstring-to-quadriceps ratio evaluation

Functional Testing

Performance-based tests evaluate movement quality and function:

  • Single-leg hop tests: Battery typically includes:
    • Single hop for distance
    • Triple hop for distance
    • Triple crossover hop
    • 6-meter timed hop
  • Jump landing assessments: Evaluating mechanics during drop vertical jump and other tasks
  • Movement quality screening: Including assessment of valgus collapse, trunk control, and other high-risk movement patterns
  • Agility testing: Sport-specific change of direction and reaction time tests

Psychological Readiness

Mental factors are increasingly recognized as critical:

  • Assessment tools: Including the ACL-Return to Sport after Injury (ACL-RSI) scale and Tampa Scale for Kinesiophobia
  • Key factors: Confidence in the knee, fear of re-injury, anxiety during sport-specific movements, and motivation
  • Interventions: Including visualization, graded exposure to anxiety-provoking situations, and sport psychology consultation when needed

Graduated Return Protocol

A phased approach is recommended for safe return:

  • Return to practice without contact
  • Return to practice with limited contact
  • Return to full practice
  • Limited game participation
  • Full unrestricted return

See Also:

Web Articles on Returning to Sport After ACL Surgery

YouTube Videos on ACL Recovery & Return to Sport