Measurement Snapshot
ReferenceTraditional reference: 20 degrees
Common Adult RangeCommon non-weight-bearing range: 15 to 20 degrees
Primary MusclesTibialis anterior, extensor digitorum longus, extensor hallucis longus
Ankle dorsiflexion affects gait, squat mechanics, and lower-limb compensation patterns. Use the measurement as one mobility datapoint inside a broader clinical exam.
Standardized Setup
- Patient Position
- Use sitting or supine for non-weight-bearing measurement. Document whether the knee is flexed or extended because gastrocnemius tension changes the result.
- Stabilization
- Stabilize the tibia and fibula while preventing foot pronation, eversion, or hip rotation from substituting for true talocrural dorsiflexion.
- Landmarks
- Use the lateral malleolus as the axis, the fibular head as the proximal reference, and the fifth metatarsal as the distal reference.
Step-by-Step Protocol
- Set the foot at neutral and calibrate the baseline.
- Move the foot toward the shin while keeping the subtalar position controlled.
- Stop at the first compensation, pain-limited end range, or firm dorsiflexion endpoint.
- Record knee position, weight-bearing status, and active or passive status with the value.
Common Measurement Errors
- Letting the medial arch collapse and calling pronation dorsiflexion.
- Comparing knee-flexed and knee-extended measurements as if they were the same test.
- Mounting the device away from the fifth metatarsal line.
Cobb Angle Pro Workflow
- Choose Ankle Dorsiflexion and select non-weight-bearing or weight-bearing context in the note.
- Align the device with the fifth metatarsal or clinician-held overlay line.
- Save knee position and test type so repeat measurements are comparable.
References
- Konor MM, Morton S, Eckerson JM, et al. Reliability of three measures of ankle dorsiflexion range of motion. Int J Sports Phys Ther. 2012;7(3):279-287.
- Norkin CC, White DJ. Measurement of Joint Motion: A Guide to Goniometry. 5th ed. F.A. Davis Company; 2016.