Relationship of Dynamic Knee Valgus With Foot Posture, Pain, and Balance in Chronic Ankle Instability.

The purpose of the study is to identify if there is a relationship between the frontal plane projection angle as a measure of dynamic knee valgus with foot posture, pain, and dynamic balance in chronic ankle instability patients.

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Key information

Conditions

Chronic Ankle Instability

Age range

15 year–32 year

Sex eligibility

All sexes

Study type

Observational

Primary location

Faculty of Physical Therapy- Cairo University

Giza, 12613, Egypt

About this study

The study design is an observational, correlational study to find if there is any relationship between the frontal plane projection angle with foot posture, pain, and dynamic balance in chronic ankle instability non-athletic patients.

The sample size is estimated to be 84. The frontal plane projection angle will be measured using a single-leg squat test and analyzed using Kinovea software.

Foot posture will be measured using the foot posture index. pain will be measured using a numerical rating scale. dynamic balance will be measured using modified star excursion balance tets

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

A history of at least 1 significant ankle sprain.
The initial sprain must have occurred at least 12 months prior to study enrollment.
The most recent injury must have occurred more than 3 months prior.
Additionally, a sprain that was associated with inflammatory symptoms (pain, swelling, etc.), Created at least 1 interrupted day of desired physical activity.
A history of the previously injured ankle joint as "giving way" and/or recurrent sprain and/or "feelings of instability." And the self-reported outcome measure foot and ankle ability measure (FAAM): ADL scale <90%.

Exclusion criteria

History of previous surgeries or fractures to the musculoskeletal structures (i.e., bones, joint structures, nerves) in either limb.
No acute injury to musculoskeletal structures of other joints of the lower extremity in the previous 3 months, which impacted joint integrity and function (i.e., sprains, fractures) resulting in at least 1 interrupted day of desired physical activity.
Participants were screened to exclude scoliosis using the Adam's Forward Bend Test (AFBT).

Treatment and study plan

Primary outcomes

correlation between the frontal plane projection angle and foot posture in chronic ankle instability patients.

Time frame: baseline (single assessment session)
NAME OF THE MEASUREMENT: "Frontal Plane Projection Angle"

UNIT OF MEASURE: "measured in degrees"

MEASUREMENT TOOL: "using a digital camera and Kinovea software"

regarding foot posture:

NAME OF THE MEASUREMENT: "Foot Posture"

MEASUREMENT TOOL: "assessed using the Foot Posture Index (FPI), a 6-item scale" Criteria assessed included palpating the talar head, assessing supra and infra lateral malleolar curvature, calcaneal inversion/eversion, and examining talo-navicular prominence. Additionally, the congruence of the medial longitudinal arch and the forefoot's abduction/adduction relative to the rearfoot was evaluated

UNIT OF MEASURE: "scored from -12 to +12
- Highly supinated foot scores between (-5 to -12)
- Supinated foot scores between (-4 to -1)
- Normal foot scores between (0 to +5)
- Pronated foot scores between (+6 to +9)
- Highly pronated foot scores between (+10 to +12).
correlation between the frontal plane projection angle and pain in chronic ankle instability patients

Time frame: baseline (single assessment session)

regarding the frontal plane projection angle:

NAME OF THE MEASUREMENT: "Frontal Plane Projection Angle"

UNIT OF MEASURE: "measured in degrees"

MEASUREMENT TOOL: "using a digital camera and Kinovea software"

regarding pain measurement: NAME OF THE MEASUREMENT: Pain Intensity

UNIT OF MEASURE:

scale extending from 0 to 10 where 0 represented "no pain" and 10 represented the "worst pain possible''

MEASUREMENT TOOL: 11-point Numeric Rating Scale (NRS-11)
correlation between the frontal plane projection angle and dynamic balance in chronic ankle instability patients.

Time frame: baseline (single assessment session)

regarding the frontal plane projection angle:

NAME OF THE MEASUREMENT: "Frontal Plane Projection Angle"

UNIT OF MEASURE: "measured in degrees"

MEASUREMENT TOOL: "using a digital camera and Kinovea software"

regarding dynamic balance:

NAME OF THE MEASUREMENT: "Dynamic Balance"

MEASUREMENT TOOL: "Modified Star Excursion Balance Test (M-SEBT)"

UNIT OF MEASURE: "normalized reach distance in centimeters (cm)

Sponsors and collaborators

Lead sponsor

Cairo University

Other

Registry information

Acronym: DKV/CAI

Important dates

Study start: 2024
Primary completion: 2025
Study completion: 2025
First posted: Aug 13, 2025
Registry last updated: Aug 13, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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Completed