SFMA Back Bend

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Overview

The SFMA back bend is a standardized movement assessment used in the Selective Functional Movement Assessment (SFMA) protocol to evaluate spinal extension and identify potential sources of pain or limitation. This assessment provides valuable information about thoracic and lumbar spine mobility.

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Instructions

From a standing position, raise both arms forward and above you and reach upwards and behind you as far as possible. Allow your hips to come forward and your shoulders and head to move back. Hold max extended position for ~1 second then return to standing.

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Example Videos

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Dimensions

Required inputs for processing:

• None

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Movement Grading as Functional

Classification as “Functional” requires:

• Shoulder flexion ROM ≥ 165°
• Hips pass in front of toes
• Shoulders pass behind heels
• No shoulder compensation (a 10° reduction in shoulder flexion when nearing peak extension)

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Generic Outputs

Every capture includes session metadata, standard joint angle/velocity time series, and 3D keypoint positions common to all movements. See Generic Outputs for the full list.

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Discrete Metrics

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Notes

• Kinematic data typically captured at 60Hz for stability activities