Assess Lower Extremity Tone

Tone in the lower extremities is assessed in the same way as in the upper extremities.

Figure 21-32 Technique for testing knee flexion.

Figure 21-33 Technique for testing knee extension

Figure 21-34 Technique for testing ankle Figure 21-35 Technique for testing plantar dorsiflexion. flexion.

Figure 21-34 Technique for testing ankle Figure 21-35 Technique for testing plantar dorsiflexion. flexion.

Grasp the foot and passively dorsiflex and plantarflex it several times, ending with dorsi-flexion of the foot. If a sudden rhythmic involuntary dorsiflexion and plantar flexion occur, ankle clonus is present. This frequently occurs in conditions of increased tone.

If any abnormality is noted in the motor strength of the upper or lower extremity, a more detailed examination should be performed. See Table 21-7 for a list of the muscle innervations and their actions.

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