Return to Sport Criteria

Hop Test Battery:

The four-hop test battery is the gold standard functional assessment:

1. Single Hop for Distance: Maximum distance on single-leg hop
2. Triple Hop for Distance: Total distance of three consecutive hops
3. Crossover Hop for Distance: Three hops crossing midline alternately
4. 6-Meter Timed Hop: Time to complete 6 meters hopping

Interpretation:

• Calculate Limb Symmetry Index (LSI) = Involved leg/Uninvolved leg x 100
• Target: LSI greater than 90% on all four tests
• Ideal: LSI greater than 95% associated with lower re-injury rates
• All four tests should be passed - not averaged

Limitations:

Hop tests assess quantity but not quality. Movement quality assessment (landing mechanics, valgus control) should supplement hop testing. Video analysis of hop performance provides additional information about movement patterns.

Isokinetic Strength Assessment:

Isokinetic dynamometry provides objective strength measurement:

• Quadriceps strength: Peak torque at 60 degrees/second
• Hamstring strength: Peak torque at 60 degrees/second
• H:Q ratio: Hamstring-to-quadriceps ratio (target greater than 60%)

LSI Targets:

• Quadriceps LSI: Greater than 90% (ideally greater than 95%)
• Hamstring LSI: Greater than 90%
• Quadriceps strength is the single most predictive factor for successful RTS

Clinical Alternatives:

When isokinetics unavailable:

• Single-leg press 1RM comparison
• Single-leg squat depth and quality
• Step-down tests with quality assessment

Quadriceps weakness at RTS is associated with both re-injury risk and development of osteoarthritis, making strength restoration critical.

Clinical Examination:

The following must be achieved before RTS consideration:

• Range of motion: Full extension (0 degrees), flexion symmetric to contralateral
• Effusion: None - joint should be completely dry
• Stability: Negative Lachman, negative pivot shift
• Pain: None with sport-specific activities

Functional Milestones:

• Full speed running without symptoms
• Cutting and pivoting without apprehension
• Sport-specific drills at match intensity
• Completed graduated return to training program

Additional Assessments:

• Y-balance test or Star Excursion Balance Test
• Drop jump landing assessment (valgus control)
• Single-leg balance with perturbation

These functional assessments evaluate neuromuscular control and proprioception, which are critical for injury prevention and should be included in comprehensive RTS testing.

ACL Return to Sport after Injury (ACL-RSI) Scale:

The ACL-RSI is a 12-item validated questionnaire assessing psychological readiness:

Domains Assessed:

• Emotions (confidence, fear, frustration)
• Confidence in performance
• Risk appraisal (perceived re-injury risk)

Scoring:

• Range: 0-100
• Higher scores indicate better psychological readiness
• Score greater than 70: Associated with successful RTS
• Score less than 56: Associated with failure to return to sport

Clinical Use:

• Administer at rehabilitation milestones
• Track progress longitudinally
• Identify athletes needing psychological intervention
• Include in RTS decision-making alongside physical criteria

Athletes with low ACL-RSI scores despite meeting physical criteria should be considered for psychology referral and may benefit from delayed RTS.

Fear of Re-injury:

Fear is the most significant psychological barrier to RTS:

• 50% of athletes cite fear as reason for not returning to sport
• Fear persists even after successful physical rehabilitation
• Associated with altered movement patterns (protective guarding)
• May increase actual re-injury risk through compensatory movements

Tampa Scale of Kinesiophobia (TSK):

• 17-item questionnaire measuring movement-related fear
• Originally developed for chronic pain populations
• Adapted for sports injury populations
• Higher scores indicate greater kinesiophobia

Addressing Fear:

• Progressive exposure to sport-specific activities
• Graded return to training and competition
• Visualization and mental rehearsal
• Psychological support from sports psychologist
• Peer support from athletes who successfully returned

Early identification of high-fear athletes allows targeted intervention and realistic timeline counseling.

Psychological Support Strategies:

Psychological readiness can be actively improved with targeted interventions:

Goal Setting:

• Short-term, achievable rehabilitation goals
• Focus on process goals not just outcome goals
• Celebrate milestones throughout recovery

Imagery and Visualization:

• Mental rehearsal of successful return
• Positive visualization of sport performance
• Stress inoculation through imagined challenging scenarios

Cognitive Restructuring:

• Address catastrophic thinking about re-injury
• Realistic risk appraisal education
• Focus on controllable factors (training, preparation)

Team Involvement:

• Maintain connection with teammates during rehabilitation
• Gradual reintegration into team training
• Coach and team support systems

Sports psychology referral is recommended for athletes with persistent fear, anxiety, or depression during rehabilitation, particularly those with low ACL-RSI scores.

Return to Sport After Shoulder Stabilization:

Surgical vs Non-operative:

• Surgical stabilization in athletes has lower recurrence (10-15% vs 50-70%)
• RTS typically 4-6 months post-Latarjet, 5-6 months post-Bankart

Criteria for RTS:

1. Range of Motion: Full symmetric ROM, especially external rotation
2. Strength: Isokinetic strength LSI greater than 90% (rotator cuff, deltoid)
3. Apprehension Testing: Negative apprehension test critical
4. Functional Testing: Sport-specific overhead or contact activities

Outcome Measures:

• Rowe Score: 100-point scale for shoulder instability outcomes
• WOSI (Western Ontario Shoulder Instability Index): Quality of life measure
• Athletic Shoulder Outcome Score (ASES)

Sport-Specific Considerations:

• Overhead athletes (swimmers, throwers): Focus on external rotation and overhead stability
• Contact athletes (rugby, football): Focus on impact tolerance
• Collision sports may require bracing initially

Psychological readiness is less studied in shoulder instability but fear of apprehension position should be addressed during rehabilitation.

Return to Sport After Ankle Instability Treatment:

Acute Lateral Ankle Sprain:

• Functional treatment preferred over immobilization
• RTS when pain-free, full ROM, and passed functional tests

Chronic Ankle Instability (CAI):

Criteria for RTS:

1. Range of Motion: Full symmetric dorsiflexion (critical for landing)
2. Strength: Eversion strength LSI greater than 90%
3. Proprioception: Single-leg balance tests
4. Functional Testing: Star Excursion Balance Test, hop tests

Outcome Measures:

• Cumberland Ankle Instability Tool (CAIT): Score less than 24 indicates instability
• Foot and Ankle Ability Measure (FAAM)
• Ankle Instability Instrument (AII)

Functional Tests:

• Single-leg balance (eyes open/closed)
• Star Excursion Balance Test (normalized reach distances)
• Side hop test
• Figure-of-eight running test

Post-Surgical (Lateral Ligament Reconstruction):

• Protected weight-bearing 6 weeks
• Progressive strengthening and proprioception
• RTS typically 4-6 months post-surgery depending on sport demands

Ankle bracing or taping during return to sport may be considered for added confidence and proprioceptive input.

Return to Sport After Muscle Strain:

Muscle injuries (hamstring, quadriceps, calf) are common in sport with high recurrence rates if RTS is premature.

Criteria for RTS:

1. Pain-Free: Full pain-free ROM
2. Strength: Isokinetic strength LSI greater than 90%
3. Flexibility: Symmetric flexibility
4. Functional Testing: Progressive running and sport-specific drills

Hamstring-Specific:

• Prone knee flexion strength (Nordic hamstring test)
• Active knee extension test (flexibility)
• Sprint testing at 100% effort without pain
• Change of direction and deceleration drills

Progressive Loading Protocol:

1. Jogging without symptoms
2. Progressive speed increase
3. Sprinting at 80%, then 90%, then 100%
4. Sport-specific drills with cutting
5. Full training, then competition

Red Flags for Delayed Return:

• Persistent MRI signal (correlation unclear but consider)
• Pain with eccentric loading
• Weakness on isokinetic testing
• Previous history of same injury

Hamstring injuries have 30% recurrence rate making careful criteria-based return essential.

Side-by-side guidance on RTS after ACL reconstruction:

The common thread across AAOS, BOA, AO/AOSSM, EFORT-aligned European groups and the IOC is convergence on objective criteria plus psychological readiness, with explicit acknowledgement that the evidence base for precise thresholds remains limited.

Registry signals on graft survival and reinjury:

• Scandinavian ACL registries (Norwegian, Swedish, Danish, KACLR) - the largest prospective datasets - report revision/graft-failure rates of roughly 2 to 5% at 2 to 5 years, markedly higher in young patients and those returning to pivoting sport.
• MOON / MARS (US prospective cohorts) confirm younger age, higher activity level and allograft (in young patients) as drivers of graft rupture.
• Registry data consistently identify age under 20-25 years and return to Level I pivoting sport as the dominant reinjury risk factors, mirroring the Wiggins meta-analysis (~23% second-ACL rate in young returners).

These registries provide the population-level evidence underpinning stringent, individualised RTS criteria.

Neuromuscular prevention programmes (applicable worldwide):

• FIFA 11+ - neuromuscular and proprioceptive warm-up; reduces ACL and lower-limb injury by up to ~50% when delivered consistently.
• Netball KNEE programme, PEP, Sportsmetrics, Knäkontroll - landing and change-of-direction technique training with comparable efficacy.

High- vs limited-resource practice variation:

• Well-resourced settings: multidisciplinary teams (surgeon, sports physician, physiotherapist, sports psychologist), isokinetic dynamometry, 3D motion analysis and validated psychological scales.
• Limited-resource settings: isokinetic testing and formal psychology input are often unavailable. Robust clinical alternatives - single-leg press/squat symmetry, the four-hop battery with a tape measure and stopwatch, single-leg balance, and the ACL-RSI questionnaire (free, paper-based) - allow criteria-based RTS without expensive equipment. Telehealth can extend specialist and psychological assessment to rural and remote athletes, though physical testing requires in-person assessment.