Understanding the Modified Ashworth Scale: Assessing Spasticity with Precision

Introduction

For understanding and managing conditions such as spasticity, several tools are used for the neurorehabilitation assessments. Among these various tools modified Ashworth Scale is a standardized method for the evaluation of muscle tone. This tool was developed by Dr. Kinnear Wilson in the 1950s. This tool has undergone modification several times to improve its reliability and applicability. In this blog, we will discuss the grading system of the Modified Ashworth Scale and its application for the assessment of muscle tone.

Assessment of muscle tone

For the assessment of muscle tone clinicians assess muscle tone by passively moving the patient’s limb through its range of motion and by assigning a score based on the resistance they faced during movement. This evaluation provides valuable information about the severity of spasticity and helps guide the patient’s treatment decisions.

Grading in Modified Ashworth Scale:

Modified Ashworth Scale consists of a 6-point grading system mainly used to check resistance during passive range of motion.

0→ No increase in tone throughout the Passive range of motion

1→ slight increase in tone.

Minimal resistance is mainly considered as catch and release throughout the range of motion.

<+1→ Minimal resistance less than half of the Passive range of motion

A catch followed by minimal resistance (less than half) of the range of motion.

2→ increase in tone through most of the Passive range of motion.

But the Limb can be moved easily.

3→ considerable increase in m/s tone.

In this Passive movement is difficult.

4→ Affected part rigid in flexion or extension.

Clinical application of Modified Ashworth Scale

Modified Ashworth Scale use in various clinical settings including

• • Neurology

• • Physiotherapy Rehabilitation,

• • Orthopedics

It serves as a tool for indispensable monitoring the progression of conditions that are associated with spasticity these include:

• • Cerebral palsy

• • Stroke

• • Spinal cord injury

• • Multiple sclerosis