Modified Thomas Test

Purpose

Screen for Modified Thomas findings.

Execution

1. 1Lie supine at the edge of a table
2. 2Pull one knee to the chest to flatten the lumbar spine
3. 3Allow the test leg to hang relaxed
4. 4Observe thigh position and knee flexion angle
5. 5Repeat on the other side

Key Observations

• Differentiate rectus femoris vs psoas
• Assess TFL (thigh abduction)

Views

• lateral

Protocol

1. 1Observe from: lateral.
2. 2Standardize start position and instructions.
3. 3Perform 2-3 trials per side when applicable.
4. 4Record key observations and any positive indicators.
5. 5Compare left vs right when applicable.

Reference

Thomas (1878); modified version: Kendall FP et al. Muscles: Testing and Function with Posture and Pain. Validity requires pelvic control: Vigotsky AD et al. PeerJ. 2016;4:e2325. Magee DJ. Orthopedic Physical Assessment.