Movement Screening and Functional Assessment Guide

A 2014 meta-analysis by Dorrel et al. pooling data from 29 studies and over 3,000 athletes found that a Functional Movement Screen (FMS) composite score of 14 or below was associated with a 1.86-fold increase in injury risk compared to athletes scoring above 14. Despite this predictive value being moderate rather than absolute, movement screening provides something training data alone cannot: a qualitative picture of how an athlete moves before loading them with velocity or force demands. This guide presents a practical, evidence-graded movement screening battery that integrates both traditional qualitative assessment and modern IMU-based dynamic testing.

Purpose of Movement Screening

Movement screening serves four distinct functions in an athlete management system:

1. Injury risk stratification: Identify athletes with movement deficiencies that increase mechanical stress on vulnerable structures before training loads are applied.
2. Baseline documentation: Establish pre-season movement quality norms to detect changes caused by fatigue, injury, or training adaptation over the season.
3. Exercise prescription: Movement screen findings directly inform exercise selection — an athlete with limited single-leg squat control needs unilateral accessory work before bilateral strength training volume is increased.
4. Return-to-sport criteria: Post-injury screening provides objective movement quality benchmarks alongside force and velocity thresholds for RTS decisions.

Importantly, screening is not performance testing. A high FMS score does not predict athletic excellence; it indicates absence of movement dysfunction. Athletes with excellent scores still require conditioning work; athletes with poor scores simply have prioritized corrective work added before loading progresses.

FMS Battery: Tests and Thresholds

The Functional Movement Screen consists of seven tests, each scored 0-3 (0 = pain, 1 = cannot complete pattern, 2 = completes with compensation, 3 = completes cleanly). Combined score range: 0-21.

Clinical thresholds: a composite score at or below 14 warrants a corrective phase before progression of loading. Any individual score of 1 (asymmetry or inability) triggers specific corrective exercise prescription regardless of the composite. An asymmetric score (e.g., 2 on right, 1 on left) on any bilateral test is more actionable than the composite score alone (Kiesel et al., 2011).

Dynamic Screening with Jump and Sprint Tests

Static and qualitative screens like the FMS capture movement competency under low load. Dynamic tests reveal how those patterns degrade under velocity and force demands. A complementary battery of three tests provides a more complete picture:

Single-Leg Countermovement Jump (SL-CMJ)

Three jumps per leg, measure height and landing impulse. The Limb Symmetry Index (LSI = weaker / stronger × 100) provides a between-limb comparison. LSI below 90% on return from lower limb injury is associated with a 4× increased re-injury risk (Behan et al., 2018). Even in healthy athletes, LSI below 90% predicts future lower extremity injury in the following season with 71% sensitivity.

Drop Jump Reactive Strength Index (RSI)

Drop from 30 cm box, minimize contact time, maximize jump height. RSI = jump height / contact time. Normative RSI values: recreational athletes 1.0-1.4; team-sport athletes 1.4-1.8; elite sprinters 2.0+. An RSI below 1.0 indicates inadequate reactive strength for high-velocity sport demands, regardless of FMS score.

10-5 Repeated Jump Test

Ten maximal-effort double-leg jumps with 5 cm target amplitude; measures mean height decline from first to last three jumps. Decline above 15% signals insufficient elastic energy return or neuromuscular fatigue that will limit performance under repeated-sprint demands.

Asymmetry Interpretation Framework

The existence of asymmetry in athletic populations is normal and context-dependent. The key question is not "is there asymmetry?" but rather "is this asymmetry harmful, functional, or trivial?" Bishop et al. (2018) propose a four-category framework:

• Harmful asymmetry: LSI below 85% on strength or jump tests in athletes cleared for full training. Requires targeted corrective intervention and volume modification for the weaker side.
• Caution zone: LSI 85-90%. Monitor closely; no immediate intervention required, but do not increase loading on the weaker side until symmetry improves.
• Acceptable asymmetry: LSI 90-95%. Common in unilateral-dominant sports (soccer, tennis). No action required unless trending in the wrong direction over consecutive screens.
• Functional asymmetry: Some asymmetry in directionally-dominant movements is a training adaptation, not a deficit. A right-handed thrower having greater right shoulder external rotation than left is not a risk factor.

How IMU Data Upgrades Traditional Screens

The FMS and similar qualitative screens have a known limitation: inter-rater reliability, while acceptable for trained administrators, is insufficient for detecting small changes over time. Two different assessors can score the same athlete 1-2 points differently on individual tests. IMU-derived metrics are objective, repeatable, and rater-independent.

Specific upgrades IMU data provides over qualitative screening:

• Landing asymmetry during the deep squat can be quantified as ground reaction force asymmetry (detectable via dual-IMU setup) rather than estimated visually.
• CMJ countermovement depth asymmetry (one hip initiating differently than the other) is visually difficult to detect but easily measured as a time offset in the IMU acceleration signal.
• Trunk acceleration magnitude during the hurdle step can be measured rather than scored 1-3, providing a continuous variable for trend analysis.

The practical recommendation is not to replace FMS with IMU testing, but to supplement it. FMS identifies which movement patterns need intervention; IMU quantifies the degree of asymmetry and tracks response to corrective training over time with precision a visual score cannot achieve.

Documentation and Re-Screening Protocol

A movement screen is worthless without a documentation system and re-screening schedule. Recommended protocol:

Screening Schedule

Pre-season (3-4 weeks before first competitive fixture): full battery — FMS + SL-CMJ + RSI + 10-5 jump test. Mid-season (at the halfway point): FMS only, plus any dynamic test that showed initial deficit. Post-season / after injury layoff: full battery. Post-injury return-to-training: full dynamic battery at minimum; FMS if the injury involved movement quality (not acute trauma).

Documentation Minimum Requirements

Record: date, assessor name, individual test scores and composite, LSI for SL-CMJ (both legs), RSI value, any painful movement (FMS score 0). Store in the athlete file with photos or video for the two lowest-scoring FMS tests. Review baseline changes at each re-screen and document whether corrective exercises were completed as prescribed — adherence to corrective work is consistently the missing variable when screens fail to show improvement.