Knee Extension: Dual Channel Stimulation Tracking

Electrode Placement
Application Instruction by Dr. Lucinda Baker

Electrode placement for knee extension stimulation dual channel for medial tracking. The greater trochanter and the patella are marked. An asymmetric biphasic waveform is used. The negative electrode for channel one is placed over the medialis oblique. The negative electrode of channel two is placed high on the lateral thigh, with the positive electrode plugged into the dual channel lead wire electrode at mid-thigh.

Knee Extension: Dual Channel Stimulation Tracking

Video Instruction
Audio Transcript:

Electrode placement for knee extension stimulation dual channel for medial tracking. The greater trochanter and the patella are marked. An asymmetric biphasic waveform is used. The negative electrode for channel one is placed over the medialis oblique. The positive lead is placed in the dual channel leadwire electrode at mid-thigh.

Channel one leads by two to three seconds during the stimulation to allow the patella to track medially. Channel two is then brought in to create full knee extension stimulation. The quality of the stimulated contraction is three out of five.

Knee Extension: Dual Channel Stimulation Tracking

Muscle Anatomy

Muscles involved in knee extension:

Rectus Femoris
Origin: Straight head from anterior inferior iliac spine. Reflected head from groove just above acetabulum
Insertion: Base of Patella

Vastus Intermedius
Origin: Superior half of anterior and Lateral surfaces of femur
Insertion: Lateral border of Patella

Vastus Medialis
Origin: Superior half of anterior and medial surfaces of femur
Insertion: Medial condyle of tibia

Vastus Lateralis
Origin: Superior half of anterior and Lateral surfaces of femur
Insertion: Lateral border and Base of Patella

Sartorius
Origin: Anterior Superior iliac spine
Insertion: Supero-medial tibia
Other actions: Hip flexion, lateral hip rotation

Knee Extension: Dual Channel Stimulation Tracking

Nerve Anatomy

Nerves involved in knee extension:

Rectus Femoris
Nerve innervation: Muscular branches of femoral nerve
Nerve root: L2, L3, L4

Vastus Intermedius
Nerve innervation: Muscular branches of femoral nerve
Nerve root: L2, L3, L4

Vastus Medialis
Nerve innervation: Muscular branches of femoral nerve
Nerve root: L2, L3, L4

Vastus Lateralis
Nerve innervation: Muscular branches of femoral nerve
Nerve root: L2, L3, L4

Sartorius
Nerve innervation: Femoral nerve
Nerve root: L2, L3, L4