ACL Graft Choice Risk Factors ACL-RSI Calculator (Return to Sport Readiness)AHA Pre-Participation Screening AOFAS Ankle-Hindfoot Scale ASES Elbow Score ASES Shoulder Score Acute:Chronic Workload Ratio (ACWR)Altitude Gain Guidelines Ankle Syndesmosis (High Ankle Sprain)Athlete's Heart vs HCM Beighton Score (Joint Hypermobility)Borg CR-10 Scale Borg RPE Scale (6–20)Brighton Criteria (BJHS)Buffalo Concussion Treadmill Test (BCTT)Child SCAT6 (Age 8–12)Commotio Cordis Protocol Cumberland Ankle Instability Tool (CAIT)DASH (UE Disability Index)Doha Groin Agreement ESC HCM SCD Risk Score ESC Pre-Participation Screening Energy Availability Calculator FAI Syndrome (Warwick)FAOS (Foot and Ankle Outcome Score)Fear-Avoidance Beliefs Questionnaire (FABQ)Female Athlete Triad Risk Foot Posture Index (FPI-6)Foot and Ankle Ability Measure (FAAM)Functional Movement Screen (FMS)Graduated Return-to-Play (GRTP) Protocol HAGOS (Hip and Groin Outcome Score)Hamstring Asymmetry Index Heat Index (Apparent Temp)Hip Outcome Score (HOS)Hooper Index (Athlete Wellness)I-PRRS (Psychological Readiness)IKDC (Objective Examination)IKDC (Subjective Knee Evaluation)Injury Severity KJOC Shoulder & Elbow Score KOOS (Knee Outcome Score)KOOS-PS (Physical Function Short Form)Kujala (Anterior Knee Pain Scale)LEAF-Q (LEA Screening)Lake Louise AMS Score Limb Symmetry Index (LSI)Little League Elbow Grading Lysholm Knee Score Marx Activity Rating Scale (MARS)Mayo Elbow Performance Score (MEPS)Modified Schober Test NEXUS C-Spine Criteria Neck Disability Index (NDI)One-Rep Max Estimator Osgood-Schlatter Severity Oswestry Disability Index (ODI)Ottawa Knee Rules Oxford Elbow Score Oxford Shoulder Score PAR-Q+ Readiness Questionnaire PARS-3 Youth Readiness Patellar Instability Severity Score Pitch Smart Guidelines (USA Baseball)Pittsburgh Knee Rules Post-Concussion Symptom Scale (PCSS)QuickDASH (Shoulder & UE)RED-S CAT (Clinical Assessment)Re-injury Anxiety Inventory (RIAI)Relative Age Effect (RAE)Return-to-Play Battery SANE Score (Single Assessment)SCAT6 (Sport Concussion Assessment Tool 6)SCOAT6 (Sub-acute and Office Follow-up)SEAQ-I Appetite Questionnaire STarT Back Screening Tool Session RPE (Internal Load)Sever's Disease Activity Single-Leg Hop Test Battery Standardized Assessment of Concussion (SAC)Steroid Equivalence Calculator Stinger / Burner Grading Sweat Rate and Rehydration TSK-11 (Tampa Scale for Kinesiophobia)TUE Criteria Checklist Tanner Stage Assessment Tegner Activity Scale (TAS)Training Monotony and Strain UCL Injury Risk (Medial Elbow)VISA-A (Achilles Tendinopathy)VISA-P Scale (Patellar Tendinopathy)VO2 Max VOMS (Vestibular/Ocular-Motor Screening)WADA Prohibited List Checker WBGT (Wet Bulb Globe Temp)WORC (Rotator Cuff Index)WOSI (Shoulder Instability Index)Wilks Score (Relative Strength)Wind Chill Index hEDS Diagnostic Criteria (2017)iHOT-33 (International Hip Outcome Tool)

Recent Journal Updates

British J HaematologyJun 16, 2026

The quiet brain injury in thrombotic thrombocytopenic purpura: Are we missing the warning signs?

Clinical Context

We think this might be relevant to the clinical guidance for Hamstring Injury Risk.

WHO NewsJun 15, 2026

Open letter to leaders of G7, G20, BRICS and all nations on finalizing the WHO Pandemic Agreement’s Pathogen Access and Benefit Sharing annex

Clinical Context

We think this has broad domain relevance to Hamstring Injury Risk.

FDA MedWatchJun 10, 2026

FDA Approves Labeling Changes for Over-the-Counter (OTC) Weight Loss Drug alli (Orlistat) to Warn of Risk of Kidney Stones and Kidney Injury

Clinical Context

We think this might be relevant to the clinical guidance for Hamstring Injury Risk.

Hamstring Asymmetry Index

0%

Optimal Balance

Left (N)

300

Right (N)

300

An asymmetry index > 15% in eccentric hamstring strength (e.g., Nordic hamstring exercise) is a primary risk factor for subsequent hamstring strain injury (HSI). Monitoring for strength symmetry is critical during late-stage rehabilitation.

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Pre-participation screening for athletes in high-risk sports (e.g., soccer, Australian rules football, sprinting, track and field) to identify those with elevated hamstring strain risk.

Return-to-sport assessment following a hamstring injury to evaluate readiness and mitigate re-injury risk.

Monitoring of athletes with a history of hamstring injuries during preseason or in-season training to guide load management.

Screening for muscle strength imbalances, flexibility deficits, or neuromuscular control issues that predispose to hamstring strains.

Surveillance of elite or collegiate athletes as part of a periodic health evaluation to detect modifiable risk factors.

Key Indication - Risk Stratification for Primary and Secondary Prevention

The Hamstring Injury Risk assessment is primarily indicated for stratifying athletes into low, moderate, or high risk categories based on a composite of modifiable factors (eccentric hamstring strength, flexibility, fatigue, previous injury) and non-modifiable factors (age, sex, sport). It aligns with the IOC consensus statement on load management and the ACSM guidelines for injury prevention in team sports. A high-risk score (e.g., >70th percentile on a validated composite) warrants targeted intervention such as Nordic hamstring exercise programs, eccentric strengthening, and flexibility training.

When Not to Use / Contraindications

Acute hamstring strain within the first 48-72 hours (use acute assessment tools like the ASLR or pain provocation tests instead).

Complete hamstring rupture or avulsion requiring surgical consultation (use MRI or ultrasound for diagnosis).

Unreliable patient effort or inability to perform maximal isometric or eccentric contractions (e.g., due to pain, fear, or lack of cooperation).

Presence of lumbar radiculopathy or referred pain mimicking hamstring pathology (requires differential diagnosis).

Use as a standalone diagnostic tool for acute injury; it is designed for risk prediction, not diagnosis.

Last Comprehensive Review: 2026

Recent Journal Updates

British J HaematologyJun 16, 2026

The quiet brain injury in thrombotic thrombocytopenic purpura: Are we missing the warning signs?

Clinical Context

We think this might be relevant to the clinical guidance for Hamstring Injury Risk.

WHO NewsJun 15, 2026

Open letter to leaders of G7, G20, BRICS and all nations on finalizing the WHO Pandemic Agreement’s Pathogen Access and Benefit Sharing annex

Clinical Context

We think this has broad domain relevance to Hamstring Injury Risk.

FDA MedWatchJun 10, 2026

FDA Approves Labeling Changes for Over-the-Counter (OTC) Weight Loss Drug alli (Orlistat) to Warn of Risk of Kidney Stones and Kidney Injury

Clinical Context

We think this might be relevant to the clinical guidance for Hamstring Injury Risk.

Hamstring Asymmetry Index

0%

Optimal Balance

Left (N)

300

Right (N)

300

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Pre-participation screening for athletes in high-risk sports (e.g., soccer, Australian rules football, sprinting, track and field) to identify those with elevated hamstring strain risk.

Return-to-sport assessment following a hamstring injury to evaluate readiness and mitigate re-injury risk.

Monitoring of athletes with a history of hamstring injuries during preseason or in-season training to guide load management.

Screening for muscle strength imbalances, flexibility deficits, or neuromuscular control issues that predispose to hamstring strains.

Surveillance of elite or collegiate athletes as part of a periodic health evaluation to detect modifiable risk factors.

Key Indication - Risk Stratification for Primary and Secondary Prevention

When Not to Use / Contraindications

Acute hamstring strain within the first 48-72 hours (use acute assessment tools like the ASLR or pain provocation tests instead).

Complete hamstring rupture or avulsion requiring surgical consultation (use MRI or ultrasound for diagnosis).

Unreliable patient effort or inability to perform maximal isometric or eccentric contractions (e.g., due to pain, fear, or lack of cooperation).

Presence of lumbar radiculopathy or referred pain mimicking hamstring pathology (requires differential diagnosis).

Use as a standalone diagnostic tool for acute injury; it is designed for risk prediction, not diagnosis.

Last Comprehensive Review: 2026