Myotonia is graded according to the modified Ashworth grading standard, and in the clinic, it is mostly divided into 5 grades, i.e., 0-4, and the higher the grading, the higher the myotonia.
Grade 1.0: Normal muscle tone, limb movement and posture are normal.
Grade 2.1: Slightly increased muscle tone, when the affected part is passively flexed or extended, there will be slight resistance in the last stage of the normal range of joint and muscle movement, or there will be movement stuttering or sudden release, there is no obvious postural abnormality.
Grade 3.1+: There is a mild increase in muscle tone, with minimal resistance at 50% of joint movement.
Grade 4.2: There is a significant increase in muscle tone, which is evident throughout most of the range of joint motion. The affected portion of the forceful movement is still movable, and mild postural abnormalities may be present.
Grade 5.3: The muscle tone is more markedly increased, passive movement is difficult, the joints and muscles in the affected area are stiff, the range of motion is small, and postural abnormalities are more pronounced.
Grade 6.4: complete muscle rigidity, the affected area shows stiffness during passive flexion and extension, and cannot move.
Increased muscle tone may be related to neuromuscular injuries and extrapyramidal abnormalities. It is recommended that patients with increased muscle tone should consult a doctor in time and be treated under the guidance of a professional doctor to avoid adverse consequences.