Hip Muscle Activity: Transverse Plane

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Introduction

0% · Heel strike

Top view · pelvis & femursAnteriorGluteus maximusGluteus medius, posterior fibersGluteus medius, anterior fibersTensor fasciae lataeGluteus minimus (deep)Short external rotators (deep)
Coral fill: superficial · dashed: deep layer (gluteus minimus, short external rotators)
Net hip rotation torque (schematic) (relative scale)

Hip rotation torque; schematic relative amplitude

+ Internal rotation− External rotation

Schematic relative amplitude; not measured values.

Net hip rotation torque (schematic)0↑ Internal rotation↓ External rotation0%20%40%60%80%100%
Gait cycle: 0%

Heel strike

Graph explanations and references

Broad sequence only: external-rotation torque in roughly the first 20%, internal-rotation torque through the rest of stance. Net torque is the combined effect at the joint, not muscle activity.

  • Gluteus maximusExternal rotator
  • Gluteus medius — posterior fibersExternal rotator
  • Short external rotators (deep)External rotator
  • Tensor fasciae lataeInternal rotator
  • Gluteus minimus (deep)Internal rotator
  • Gluteus medius — anterior fibersInternal rotator

Highlights show the timing described in the narration, not measured EMG. Moving segment: femur relative to pelvis (early stance) and pelvis relative to the supporting femur (later stance).

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Chapters
Learning objectives

Relate external-rotator eccentric control of femoral rotation in early stance and internal-rotator assistance of forward pelvic rotation over the supporting femur.

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