Manual Muscle Test

Medial Hamstrings

· 1. Neurological & Functional Insights

· Primary knee flexors with strong medial stability role.

· Support pelvic motion through posterior chain integration.

· Important in deceleration and gait stance control.

· 2. Clinical Relevance

· Weakness increases ACL strain risk.

· Tightness contributes to posterior pelvic tilt.

· Common site of strain in sprinting athletes.

· 3. Origin

· Ischial tuberosity

· 4. Insertion

· Pes anserinus (ST)

· Posterior medial tibia (SM)

· 5. Innervation

· Tibial nerve (L5–S2)

· 6. Actions – Open Kinetic Chain (OKC)

· Knee flexion

· Hip extension (assist)

· Medial rotation (knee flexed)

· 7. Actions – Closed Kinetic Chain (CKC)

· Posterior chain stabilization

· Medial knee control

· 8. Associated Ligaments

· Posterior medial capsule

· 9. Associated Organs

Fascial:

· Posterior thigh fascia

Viscerosomatic:

· L5–S2

TCM:

· Bladder meridian

VM:

· Posterior fascial chain tension

Lateral Hamstrings

· 1. Neurological & Functional Insights

· Primary lateral stabilizer of knee flexion.

· Controls tibial ER and deceleration mechanics.

· Important in sprint propulsion.

· 2. Clinical Relevance

· Tightness linked to lateral knee pain.

· Weakness increases risk of hamstring strain.

· Overactivity contributes to pelvic torsion.

· 3. Origin

· Ischial tuberosity (long head)

· Linea aspera (short head)

· 4. Insertion

· Fibular head

· 5. Innervation

· Tibial & common fibular nerves (L5–S2)

· 6. Actions – Open Kinetic Chain (OKC)

· Knee flexion

· External rotation (flexed knee)

· 7. Actions – Closed Kinetic Chain (CKC)

· Lateral knee stabilization

· Assists hip extension

· 8. Associated Ligaments

· LCL connections

· 9. Associated Organs

Fascial:

· Lateral thigh fascia

Viscerosomatic:

· L5–S2

TCM:

· Gallbladder meridian

VM:

· Lateral chain tension

Hamstrings (Variation)

· 1. Neurological & Functional Insights

· Targets specific fiber recruitment for imbalance detection.

· Useful for identifying rotational bias patterns.

· Reflects unique loading in sport-specific tasks.

· 2. Clinical Relevance

· Variation exposes hidden asymmetries.

· Important for assessing dynamic stability.

· Helps refine return-to-sport decisions.

· 3. Origin

· Ischial tuberosity

· 4. Insertion

· Medial or lateral tibia (angle dependent)

· 5. Innervation

· L5–S2

· 6. Actions – Open Kinetic Chain (OKC)

· Flexion with rotational emphasis

· 7. Actions – Closed Kinetic Chain (CKC)

· Rotational knee stabilization

· 8. Associated Ligaments

· Posterior capsule

· 9. Associated Organs

Fascial:

· Posterior chain fascia

Viscerosomatic:

· L5–S2

TCM:

· Bladder / Gallbladder

VM:

· Posterior fascial modulation

Rectus Femoris

· 1. Neurological & Functional Insights

· Biarticular extensor influencing both hip and knee mechanics.

· Important for explosive power and kicking.

· Controls femoral tracking via quadriceps synergy.

· 2. Clinical Relevance

· Tightness contributes to anterior pelvic tilt.

· Weakness reduces sprinting and jumping capacity.

· Common site for strain in running sports.

· 3. Origin

· AIIS

· Superior acetabular rim

· 4. Insertion

· Tibial tuberosity via patellar tendon

· 5. Innervation

· Femoral nerve (L2–L4)

· 6. Actions – Open Kinetic Chain (OKC)

· Knee extension

· Hip flexion

· 7. Actions – Closed Kinetic Chain (CKC)

· Anterior pelvic stabilization

· Femoral tracking

· 8. Associated Ligaments

· Patellar tendon

· Quadriceps tendon

· 9. Associated Organs

Fascial:

· Anterior thigh fascia

Viscerosomatic:

· L2–L4

TCM:

· Stomach meridian

VM:

· Anterior chain tension

Rectus Femoris (Variation)

· 1. Neurological & Functional Insights

· Emphasizes differential fiber recruitment.

· Targets hip-flexion dominant activation.

· Useful for assessing asymmetrical loading.

· 2. Clinical Relevance

· Supports identifying compensatory quadriceps patterns.

· Relevant for post-ACL rehab.

· Aids correction of pelvic control.

· 3. Origin

· AIIS

· 4. Insertion

· Tibial tuberosity

· 5. Innervation

· Femoral nerve

· 6. Actions – Open Kinetic Chain (OKC)

· Hip-flexion-biased engagement

· 7. Actions – Closed Kinetic Chain (CKC)

· Pelvic control

· 8. Associated Ligaments

· Quadriceps tendon

· 9. Associated Organs

Fascial:

· Anterior thigh fascia

Viscerosomatic:

· L2–L4

TCM:

· Stomach

VM:

· Anterior fascial chain

Vastus Medialis

· 1. Neurological & Functional Insights

· Critical for medial stabilization of patella.

· Works strongly in terminal knee extension.

· Important for shock absorption.

· 2. Clinical Relevance

· Weakness contributes to patellofemoral pain.

· Tightness creates medial knee compression.

· Important in deceleration control.

· 3. Origin

· Medial linea aspera

· 4. Insertion

· Medial patella → tibial tuberosity

· 5. Innervation

· Femoral nerve (L2–L4)

· 6. Actions – Open Kinetic Chain (OKC)

· Knee extension

· 7. Actions – Closed Kinetic Chain (CKC)

· Patellar tracking stabilization

· 8. Associated Ligaments

· Medial patellofemoral ligament (functional)

· 9. Associated Organs

Fascial:

· Medial thigh fascia

Viscerosomatic:

· L2–L4

TCM:

· Spleen meridian

VM:

· Medial chain

Vastus Lateralis

· 1. Neurological & Functional Insights

· Primary lateral stabilizer of patella.

· Produces significant knee extension torque.

· Important for force production in running.

· 2. Clinical Relevance

· Tightness can pull patella laterally.

· Weakness reduces extension power.

· Overactivity disrupts patellar tracking.

· 3. Origin

· Greater trochanter

· Lateral linea aspera

· 4. Insertion

· Lateral patella → tibial tuberosity

· 5. Innervation

· Femoral nerve

· 6. Actions – Open Kinetic Chain (OKC)

· Knee extension

· 7. Actions – Closed Kinetic Chain (CKC)

· Lateral patellar stabilization

· 8. Associated Ligaments

· Lateral patellofemoral ligament (functional)

· 9. Associated Organs

Fascial:

· Lateral thigh fascia

Viscerosomatic:

· L2–L4

TCM:

· Gallbladder

VM:

· Lateral fascial chain

Vastus Intermedius

· 1. Neurological & Functional Insights

· Deep extensor providing consistent extension force.

· Stabilizes patella via central pull.

· Works synergistically with RF.

· 2. Clinical Relevance

· Weakness reduces terminal extension strength.

· Inhibition common after knee surgery.

· Key for stair climbing and loaded extension.

· 3. Origin

· Anterior femur

· 4. Insertion

· Patella → tibial tuberosity

· 5. Innervation

· Femoral nerve

· 6. Actions – Open Kinetic Chain (OKC)

· Knee extension

· 7. Actions – Closed Kinetic Chain (CKC)

· Dynamic patellar stability

· 8. Associated Ligaments

· Quadriceps tendon

· 9. Associated Organs

Fascial:

· Anterior thigh deep fascia

Viscerosomatic:

· L2–L4

TCM:

· Stomach

VM:

· Anterior deep fascial chain

Module references

· Standring S, ed. Gray’s Anatomy: The Anatomical Basis of Clinical Practice. Elsevier.

· Neumann DA. Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation. Elsevier.

· Kendall FP et al. Muscles: Testing and Function with Posture and Pain. Lippincott Williams & Wilkins.

· Netter FH. Atlas of Human Anatomy. Elsevier.

· Barral JP, Mercier P. Visceral Manipulation. Eastland Press (framework-specific associations).

· Deadman P, Al-Khafaji M, Baker K. A Manual of Acupuncture. Journal of Chinese Medicine Publications (traditional channel associations).

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