--- title: "Ankle Inversion Test" description: "Ankle inversion ROM testing requires consistent positioning, stabilisation, device placement, side comparison and interpretation." url: https://help.matassessment.com/en/articles/162-ankle-inversion-test collection: "Range of Motion (AROM/PROM)" updated: 2026-05-21 language: en --- # Ankle Inversion Test Ankle inversion ROM testing requires consistent positioning, stabilisation, device placement, side comparison and interpretation. The Ankle Inversion Test measures how far the sole of the foot turns inward. It can be measured actively or passively, but the result is influenced by subtalar, midfoot and forefoot movement. Recording the method, side, pain, symptoms and compensation helps make the result useful for movement comparison and progress tracking. ## Introduction A client may show limited foot control during balance tasks, feel restricted when changing direction or have a visible side-to-side difference in foot movement. Ankle inversion ROM testing helps quantify this movement. Because inversion is not a pure single-joint motion, interpretation should be practical. The result is best used to compare sides, monitor change and add context to strength, balance, gait, running or hopping findings. ## Quick Summary Test name: Ankle Inversion Test Purpose: Measure ankle/foot inversion range of motion Movement: Sole of the foot turns inward Joint/body region: Ankle, subtalar joint and foot Plane: Frontal plane with coupled foot motion ROM type: Active ROM, passive ROM or both Score: Degrees of inversion Equipment: Goniometer, inclinometer or Measurz ROM workflow Best used with: Ankle eversion, balance, hop tests, foot strength, ankle strength and gait assessment Key limitation: Inversion includes motion from multiple foot joints, not one isolated joint ## What Is the Ankle Inversion Test? The Ankle Inversion Test measures the inward turning movement of the foot. The movement is often described as subtalar inversion, but in practical testing it may include motion from the subtalar joint, midfoot and forefoot. ## Why It Is Used The test is used to establish baseline movement, compare sides and monitor change. It may help inform: Balance programming Foot and ankle strengthening Change-of-direction preparation Ankle mobility monitoring Side-to-side comparison Progress tracking after changes in symptoms or loading ## What It Measures The test measures inversion ROM in degrees. It may be influenced by: Subtalar joint motion Midfoot mobility Foot posture Pain or stiffness Strength and motor control Professional stabilisation Measurement landmarks Device placement Warm-up and previous activity It does not explain why the movement is reduced or increased. ## Active vs Passive Range of Motion Active inversion measures how far the client can turn the sole inward using their own control. Passive inversion measures the available movement when the professional guides the foot. Active and passive values should be recorded separately because they provide different information. ## Who It Is Useful For This test may be useful for runners, field sport athletes, balance clients, gym clients, court sport athletes, dancers and anyone where side-to-side ankle/foot movement comparison is useful. ## Equipment Required Goniometer or inclinometer Treatment table or chair Pain scale Measurz for recording ROM Optional towel roll Optional comparison side notes ## Step-by-Step Protocol or How to Apply This in Practice ### Starting position Position the client sitting or lying with the lower leg supported and foot free to move. ### Client position Keep the knee and hip relaxed. Record whether the knee is flexed or extended. ### Professional position Sit or stand at the foot end so the heel and lower leg can be stabilised. ### Body/joint setup Start with the ankle near neutral. ### Stabilisation Stabilise the distal tibia and fibula. Minimise whole-leg rotation. ### Movement instruction For active ROM, ask the client to turn the sole of the foot inward. For passive ROM, guide the foot into inversion gently until the first firm endpoint, symptom limit or agreed end range. ### Measurement landmarks Goniometry methods vary. A common approach is to align the axis near the anterior ankle or between the malleoli, with reference to the tibia and foot. Use the same landmarks each time. ### Inclinometer or device placement If using an inclinometer, place it consistently on the plantar or dorsal aspect of the foot according to your method. Record placement. ### What to ask Ask about pain, stretch, stiffness, symptom location and whether movement feels familiar. ### Stopping rules Stop if pain increases, the client guards, the lower leg rotates or the movement cannot be measured consistently. ### What to record Record active/passive ROM, side, degrees, device, pain score, symptoms, position and compensation. ### Number of trials Use one to three trials and record the selected scoring method. ### Retest consistency Keep device placement, landmarks, stabilisation and position consistent. ## Scoring and Interpretation The score is recorded in degrees. A higher inversion value indicates more inward foot movement under the tested setup. A lower value indicates less inversion ROM compared with the other side, baseline or selected benchmark. Interpretation is stronger when paired with: Eversion ROM Pain score Side-to-side comparison Foot strength Balance testing Hop testing Running or cutting tasks Movement quality The result does not explain the cause of movement difference on its own. ## Normative Data, Benchmarks or Reference Values Evidence level: **Level 3 — limited exact protocol-matched norms; use practical comparison guidance.** Common teaching references often describe ankle/foot inversion around **30–35 degrees**, but values vary depending on whether the measurement captures subtalar-only motion or combined foot motion. Practical benchmarks: Compare both sides Track baseline to retest Compare active and passive ROM Record pain at end range Track movement quality Interpret with eversion, balance and strength findings ## Reliability and Validity Lower-limb ROM reliability varies depending on joint, device, landmarks, examiner and movement measured. A recent systematic review reported that goniometry, photogrammetry and smartphone methods can be reliable when standardised, but reliability is not automatic across all lower-limb movements. For ankle inversion specifically, repeatability depends heavily on stabilising the lower leg and using the same foot landmarks. Small changes should be interpreted cautiously unless repeated and supported by related findings. ## Common Errors and Testing Limitations Common errors include measuring whole-leg rotation, poor lower-leg stabilisation, inconsistent landmarks, changing active and passive methods, over-forcing passive ROM, not recording pain and assuming broad norms apply to every client. Limitations include multi-joint foot motion, measurement variability, foot structure differences and inconsistent endpoint definitions. ## Practical Applications Use ankle inversion ROM to track side-to-side movement, monitor foot and ankle change, inform balance or strength programming and decide whether further strength, balance or functional tests are useful. ## How to Record This in Measurz In Measurz, record baseline inversion ROM in degrees using the inclinometer or chosen device. Record whether the result is active or passive, side tested, pain score, symptom location, movement direction, test position, device used and compensation notes. Compare both sides and track progress across sessions. Add related strength, balance, hop or functional findings. ## Related Tests or Internal Linking Suggestions Ankle Eversion Test Ankle Dorsiflexion Test Ankle Plantarflexion Test Single-Leg Balance Test Y-Balance Test Hop Tests Ankle Strength Testing ## FAQs ### What is normal ankle inversion ROM? Common references often describe around 30–35 degrees, but values vary by protocol, device, foot structure and measurement method. ### How do you measure ankle inversion? Measure the inward turning movement of the foot using a goniometer or inclinometer while stabilising the lower leg. ### Should inversion be measured actively or passively? Both can be useful. Active ROM shows controlled movement, while passive ROM shows available movement when guided. ### What does reduced ankle inversion mean? It means less inward foot movement under the tested setup. It does not explain the cause by itself. ### How should ankle inversion be tracked? Use the same position, device, landmarks and active/passive method each session. ## Key Takeaways Ankle inversion measures inward foot movement. The result includes subtalar and foot contribution. Active and passive values should be recorded separately. Side-to-side comparison is often more useful than broad norms. Measurz should capture degrees, pain, side, device and compensation. ## References Clarkson, H. M. (2020). _Musculoskeletal assessment: Joint range of motion, muscle testing, and function_ (4th ed.). Wolters Kluwer. Milanese, S., et al. (2025). Reliability of range of motion measurements obtained by goniometry, photogrammetry and smartphone applications in lower limb joints: A systematic review. _Musculoskeletal Science and Practice_. Needs verification. Norkin, C. C., & White, D. J. (2016). _Measurement of joint motion: A guide to goniometry_ (5th ed.). F. A. Davis.