Muscles (DPT) — Complete Guide

High-yield DPT article covering Gluteal muscles, Quadriceps, Hamstrings and Calf muscles with OINA, biomechanics, gait role and clinical importance.

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Introduction

Lower limb muscles gait, posture, balance, stair climbing, running aur functional mobility ke liye fundamental role play karte hain. DPT me in muscles ko sirf origin/insertion tak limited nahi rakha jata — balkay unka functional chain role, weakness patterns, aur rehab implications samajhna zaroori hota hai.

DPT Concept: Lower limb muscle groups ko “hip power → knee control → ankle push-off” chain me samjho.

1) Gluteal Muscles

1.1 Gluteus Maximus

  • Origin: Posterior ilium, sacrum, coccyx
  • Insertion: IT band & gluteal tuberosity
  • Nerve: Inferior gluteal nerve (L5–S2)
  • Action: Powerful hip extension & external rotation

Clinical: Weakness → difficulty climbing stairs, rising from chair.

1.2 Gluteus Medius & Minimus

  • Origin: Lateral ilium
  • Insertion: Greater trochanter
  • Nerve: Superior gluteal nerve (L4–S1)
  • Action: Hip abduction & pelvic stabilization

Clinical: Weakness → Trendelenburg sign

During single-leg stance, gluteus medius pelvis ko level rakhta hai.

2) Quadriceps

Quadriceps 4 muscles ka group hai jo knee extension ke liye responsible hai.

Muscle Origin Insertion Nerve Action
Rectus Femoris AIIS Patella → Tibial tuberosity Femoral (L2–L4) Hip flexion + Knee extension
Vastus Lateralis Femur Patella Femoral Knee extension
Vastus Medialis Femur Patella Femoral Knee extension (VMO stabilizes patella)
Vastus Intermedius Femur Patella Femoral Knee extension

Clinical Importance:

  • VMO weakness → patellar tracking issues
  • Quad inhibition after knee swelling
  • Essential for sit-to-stand & stair climbing

3) Hamstrings

Posterior thigh muscles jo hip extension aur knee flexion karte hain.

Muscle Origin Insertion Nerve Action
Biceps Femoris Ischial tuberosity Fibular head Sciatic Knee flexion
Semitendinosus Ischial tuberosity Medial tibia Sciatic Hip extension
Semimembranosus Ischial tuberosity Medial tibia Sciatic Hip extension

Clinical:

  • Hamstring tightness → posterior pelvic tilt
  • Strains common in sprinters
  • Important in terminal swing phase of gait

4) Calf Muscles

4.1 Gastrocnemius

  • Origin: Femoral condyles
  • Insertion: Calcaneus via Achilles tendon
  • Nerve: Tibial nerve
  • Action: Plantarflexion + Knee flexion

4.2 Soleus

  • Origin: Tibia & fibula
  • Insertion: Calcaneus
  • Action: Postural plantarflexor

4.3 Plantaris

Small accessory muscle.

Clinical:

  • Achilles tendon rupture
  • Calf tightness → limited dorsiflexion
  • Essential for push-off in gait
Gastrocnemius = power muscle, Soleus = endurance/postural muscle.

MCQs (High Yield)

1. Trendelenburg sign kis muscle weakness se hota hai?
Answer: Gluteus medius
2. Quadriceps ko kaunsa nerve supply karta hai?
Answer: Femoral nerve
3. Hamstrings ka origin kahan hota hai?
Answer: Ischial tuberosity
4. Powerful hip extensor kaunsa muscle hai?
Answer: Gluteus maximus
5. Achilles tendon kis muscles ka common tendon hai?
Answer: Gastrocnemius + Soleus
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