Introduction: Why Movement Screening Matters for Injury Prevention

In sports medicine, strength and conditioning, and physical therapy, the ability to predict and prevent injuries is invaluable. Functional Movement Screening (FMS) has emerged as one of the most widely used tools for assessing fundamental movement patterns. Designed to identify asymmetries, weaknesses, and mobility deficits, FMS provides a systematic method for pinpointing potential injury risks before they manifest as tissue damage or chronic pain. This article explores the mechanics of FMS, its practical applications, supporting research, and how it integrates into a comprehensive injury prevention strategy. By understanding what FMS measures and how to act on its results, professionals can shift from reactive treatment to proactive risk reduction.

What Is Functional Movement Screening?

Developed by physical therapists Gray Cook and Lee Burton in the 1990s, Functional Movement Screening is a standardized assessment battery that evaluates seven fundamental movement patterns. Unlike traditional fitness assessments that focus on isolated strength or flexibility, FMS observes how the body moves as an integrated system. It aims to identify compensatory patterns, lack of motor control, or other dysfunctions that may predispose an individual to injury during sports, daily activities, or exercise.

The FMS scoring system assigns a value from 0 to 3 for each test, with 3 indicating a perfect pattern, 2 a functional but imperfect pattern, 1 an inability to complete the pattern, and 0 if pain occurs. Asymmetry—differences between left and right sides—is also flagged as a red flag for heightened injury risk. Research suggests that a total score of 14 or less out of 21 is associated with a significantly increased likelihood of injury in active populations. The screening takes about 15–20 minutes and requires minimal equipment: a measuring device, a hurdle, and a 2x6 board. Proper training and certification are recommended for reliable scoring.

The Seven Core FMS Tests

Each of the seven tests targets a specific aspect of mobility, stability, or coordination. Together, they provide a snapshot of an individual’s movement competency. Below is an expanded breakdown of each test, including typical findings and their implications for injury risk.

1. Deep Squat

This test assesses bilateral, symmetrical mobility of the hips, knees, and ankles, as well as thoracic spine extension and core stability. A full-depth squat with arms overhead demands coordinated motion through multiple joints. Limitations often reveal hip or ankle stiffness, poor core control, or inadequate shoulder mobility. Athletes who cannot maintain a vertical torso or keep their heels on the ground may be at higher risk for patellofemoral pain, lower back strain, or shoulder impingement. Corrective strategies typically target ankle dorsiflexion, hip flexion, and thoracic extension.

2. Hurdle Step

The hurdle step evaluates single-leg balance, hip mobility, and dynamic stability. By stepping over a barrier at the height of the tibial tuberosity, it challenges the body to maintain alignment and control during a reciprocal, asymmetrical movement. Common faults include lateral trunk lean or foot drop, indicating hip or core weakness. A poor score on this test can signal increased risk for ankle sprains, groin strains, or knee injuries during unilateral sporting actions like sprinting or cutting.

3. Inline Lunge

Performed with a tandem stance on a 2x6 board, the inline lunge tests hip, ankle, and knee stability as well as trunk control. The movement simulates deceleration and cutting motions seen in many sports. Restrictions often involve tight hip flexors or poor quadriceps and gluteal control. A low score may indicate that the athlete compensates with trunk rotation or lateral flexion, which can overload the lumbar spine or the leading knee. Corrective work focuses on hip mobility and eccentric strength of the quadriceps and gluteals.

4. Shoulder Mobility

This test measures the range of motion of the shoulder complex in a closed-chain position. The athlete reaches one arm over the shoulder and the other under the shoulder, attempting to touch fingers behind the back. Limitations here can precede rotator cuff issues or shoulder impingement. Asymmetries are common in overhead sport athletes (e.g., baseball, tennis, volleyball) and should prompt a detailed shoulder assessment including special orthopedic tests. Corrective exercises often include thoracic mobility drills, latissimus dorsi stretches, and scapular stabilization.

5. Active Straight Leg Raise

Rather than assessing hamstring flexibility alone, the active straight leg raise evaluates the ability to maintain pelvic stability while lifting a leg with a dorsiflexed ankle. Deficits often point to poor hamstring extensibility or compensatory pelvic tilt, which can contribute to lower back or hamstring injuries. A low score is particularly relevant for runners, dancers, and gymnasts. Mobilizing the hamstrings and improving core control of the pelvis are typical intervention goals.

6. Trunk Stability Push-Up

This test challenges the ability to stabilize the trunk during an upper-extremity pushing motion. The athlete performs a slow push-up from the floor while keeping the spine in neutral alignment. Inability to maintain a straight line from head to heels suggests poor core stability or motor control, a known risk factor for low back pain. Interestingly, this test does not assess pure strength; many strong athletes fail because they cannot prevent anterior pelvic tilt or spinal extension. Core bracing and anti-extension exercises are commonly prescribed.

7. Rotary Stability

The rotary stability test examines multiplanar trunk stability during a quadruped movement. Athletes must touch one knee to the same elbow and then the opposite knee to the opposite elbow while maintaining spine alignment. This movement pattern reflects the coordination of hip, core, and shoulder stabilizers required for dynamic activities. Low scores here indicate poor lumbopelvic control and may increase the risk of low back injury during rotational sports like golf, tennis, or martial arts. Corrective work often involves quadruped bird-dog variations and anti-rotation drills.

How FMS Identifies Injury Risk

The premise behind FMS is that poor movement patterns create inefficient loading and compensatory stress on tissues. When a joint lacks adequate mobility, neighboring joints compensate, often leading to overuse injuries. For example, a dancer with limited ankle dorsiflexion may rely more on knee and hip motion during landing, increasing the risk of patellofemoral pain syndrome or groin strains. FMS makes these compensations visible.

Several studies have linked lower FMS composite scores with higher injury rates in military personnel, athletes, and recreational exercisers. A landmark study published in the North American Journal of Sports Physical Therapy found that professional football players scoring ≤14 on the FMS were 11 times more likely to suffer a serious injury during the season compared to those scoring higher. Subsequent research in other populations has reinforced the idea that movement quality is a modifiable risk factor. However, it is important to note that FMS is not a diagnostic tool; it screens for movement dysfunction, not injury itself. A low score indicates heightened risk but does not guarantee injury. The predictive power of FMS improves when combined with training load and injury history data.

Asymmetry as a Primary Red Flag

Even a relatively high total score can obscure a dangerous asymmetry. For instance, a soccer player might score a 2 on the left side and a 1 on the right for the hurdle step. This imbalance in hip stability can overload the lower-risk side during cutting and planting, leading to a knee or ankle injury. The FMS protocol mandates that any asymmetry greater than or equal to one point triggers further assessment, regardless of total score. Accumulating evidence suggests that asymmetry alone may be as strong a predictor of injury as the composite score. Therefore, practitioners should always prioritize addressing asymmetries when designing corrective programs.

Benefits of Implementing FMS in Training Programs

  • Early detection of movement limitations before they cause pain or compensation — this is the primary advantage of proactive screening.
  • Personalized exercise prescription: Results guide corrective strategies such as foam rolling for tight tissues, stretching hypomobile joints, and activation drills for weak stabilizers.
  • Objective baseline: Progress can be tracked over time with repeat screening, providing data on whether interventions are effective.
  • Enhanced performance: By correcting inefficient patterns, athletes can produce and transfer force more effectively, improving power output and reducing energy waste.
  • Reduced risk of re-injury: FMS identifies lingering dysfunction after a prior injury, helping prevent recurrence through targeted corrective work.
  • Improved communication: A common movement language between coaches, trainers, physical therapists, and athletes facilitates team-based care.
  • Cost-effectiveness: A single screening costs far less than treating an injury; teams that use FMS may lower overall medical expenses over a season.

Practical Application: From Screen to Intervention

After an FMS assessment, the goal is to use the results to design a targeted corrective exercise program. This is typically done through a process called smoke screening: looking at the lowest-scoring patterns and identifying the primary cause. Often, one limitation (e.g., poor ankle mobility) will drive several low scores (e.g., deep squat, inline lunge, hurdle step). Addressing the root cause of the movement deficiency can improve multiple test scores simultaneously and reduce overall injury risk.

Corrective programs usually follow a hierarchy: first, address mobility restrictions using foam rolling, stretching, or joint mobilization; second, activate inhibited or weak muscles using isometric or low-load exercises; third, retrain the movement pattern under low load with cues and feedback; and finally, integrate the correction into sport-specific drills under higher intensity. For example, an athlete who scores poorly on the deep squat due to limited ankle dorsiflexion may start with a calf stretch and ankle mobilization, then progress to an overhead squat with a heel lift before unloading the bar.

It is essential that FMS screening and corrective programming be performed by a qualified professional. Incorrect interpretation of scores or inappropriate exercises can reinforce poor patterns rather than fix them. Organizations such as the National Strength and Conditioning Association (NSCA) and the American College of Sports Medicine (ACSM) recommend FMS certification as part of a comprehensive injury risk management framework. Furthermore, re-screening every 4–6 weeks allows coaches to adjust programming based on objective progress.

Limitations and Criticisms of FMS

No assessment tool is perfect, and FMS has its detractors. Some researchers argue that the predictive validity of FMS is modest, particularly in specific populations like elite athletes whose sport-specific movement demands differ from generic patterns. A meta-analysis in the British Journal of Sports Medicine concluded that while FMS has moderate predictive value for injury in military and some athletic cohorts, it should not be used as a standalone screening test. Factors like training load, previous injury history, and psychological readiness also play significant roles. Combining FMS with training load monitoring (e.g., acute:chronic workload ratio) improves injury prediction accuracy.

Another criticism is the potential for inter-rater reliability issues. Although standardized training reduces variability, different practitioners may assign slightly different scores for the same movement. To mitigate this, the FMS team recommends regular re-certification and use of the FMS Kit with clear measurement guidelines. Video recording can also improve consistency.

Finally, FMS does not assess dynamic, high-velocity movements like sprinting or jumping. For more sport-specific risk assessment, complementary tests such as the Y-Balance Test for dynamic balance or the Landing Error Scoring System (LESS) for jump-landing mechanics can be used alongside FMS to capture different aspects of injury risk. No single screen captures all risk factors; a battery of tests is more robust.

Integrating FMS Into a Broader Injury Prevention Strategy

An effective injury prevention program does not rely on a single test. Instead, FMS should be part of a multi-factorial approach that includes:

  • Pre-participation physical examinations by a sports medicine professional
  • Training load monitoring (e.g., acute:chronic workload ratio) to avoid spikes in volume or intensity
  • Sport-specific performance assessments such as the 40-yard dash, vertical jump, or agility tests
  • Psychological readiness and sleep quality evaluation — mental fatigue and poor sleep are independent injury risk factors
  • Ongoing movement quality education for athletes and coaches to foster a culture of injury prevention
  • Regular re-screening at key intervals (pre-season, mid-season, post-injury return to sport)

When used correctly, FMS provides a baseline that helps professionals individualize training emphasis. A team of trainers might use FMS to allocate resources: those with lower scores receive extra corrective work before high-volume or high-intensity training phases. Over the course of a season, periodic re-testing can track whether movement patterns improve or decline. Integrating FMS with other monitoring tools creates a comprehensive picture of each athlete's readiness and risk profile.

Evidence-Based Resources for Further Reading

For professionals seeking a deeper understanding of FMS science and application, the following external resources are recommended:

Conclusion: Making FMS Work for You

Functional Movement Screening offers a valuable lens through which to view movement quality. By identifying asymmetries, mobility restrictions, and stability deficits early, it empowers professionals to intervene before injuries sideline athletes. While not a crystal ball, FMS provides objective data that can guide training priorities and reduce overall risk. The key is to pair screening with sound corrective intervention, integrate it with other assessments, and recognize its limitations. When applied by a skilled practitioner as part of a comprehensive injury prevention program, FMS becomes a cornerstone of proactive athlete management rather than a reactive measure after an injury has already occurred.

Whether you are a coach building a more resilient team or an individual seeking to stay active pain-free, incorporating FMS into your routine can help you move better, train smarter, and stay in the game longer. The goal is not perfection of the screening scores, but improved movement quality and reduced injury burden over the long term. By committing to regular screening, thoughtful corrective exercise, and a multi-factorial approach to health, you can turn movement screening into a powerful tool for longevity in sport and daily life.