Stroke Motor Recovery, Brunnstrom Stages, and Constraint-Induced Movement Therapy
CVA · EP 06 · STROKE
Before You Listen
- Prerequisites: middle cerebral artery (MCA) and anterior cerebral artery (ACA) territories and the motor homunculus (CVA-01); upper vs lower motor neuron lesion patterns.
- Runtime: 34 minutes 28 seconds.
- Topic in one line: the seven Brunnstrom stages, the four synergy patterns, the four classic neurorehabilitation techniques, the constraint-induced movement therapy (CIMT) inclusion criteria, and the prognostic markers that decide who recovers.
Vignette. A 62-year-old right-handed woman, 6 months post left-MCA infarct, has voluntary movement of the right upper extremity but every reach produces scapular retraction and elevation, shoulder external rotation with the arm flaring outward, forceful elbow flexion, palm turning upward, wrist and finger flexion. She cannot extend the elbow with fingers flexed. Active wrist extension 30°, active finger extension 15°. She uses the right arm for nothing.
What is the Brunnstrom stage, the named synergy pattern, the CIMT candidacy decision, and the behavioral phenomenon at play?
Section 1 — Brunnstrom Stages 1 through 7
Bottom line: recovery moves flaccid → spastic synergies → out-of-synergy emergence → selective control, in that order; spasticity peaks at stage 3 and many patients plateau there.
Signe Brunnstrom, a Swedish-American physical therapist, mapped a remarkably consistent post-stroke recovery sequence in the 1960s. The seven stages describe order of recovery, not speed or ceiling. Patients can plateau at any stage, and the upper and lower extremities frequently progress at different rates in the same patient because the leg homunculus is medial (dual MCA + ACA supply with collateral via the anterior communicating artery) while the hand homunculus is lateral (MCA-dependent, no collateral safety net). The downstream pattern is a stage-5 leg walking around independently while the same patient’s stage-3 arm remains locked against the chest. Recovery also follows a proximal-to-distal gradient within each limb (shoulder and hip lead, hand and foot trail) paralleling the order described originally by Twitchell that Brunnstrom built her stages from.
- Stage 1: Flaccidity. No tone, no voluntary movement, no reflex. Hemiplegic shoulder is at peak risk for inferior glenohumeral subluxation because the supraspinatus and rotator cuff are silent and the bony glenoid is too shallow to hold the humeral head against gravity. The dropped humeral head produces a palpable finger-width gap below the acromion; the stretched capsule triggers durable secondary pain syndromes once sensation returns. Slings, lap trays, and positioning are mandatory from day 1. Persistent flaccidity at 3+ weeks signals catastrophic corticospinal tract damage and a poor recovery prognosis.
- Stage 2: Spasticity appears; basic synergies are involuntary. Mass-pattern responses triggered reflexively by attempted movement, yawning, or startle. Counter-intuitively a positive prognostic sign, descending pathways are regaining excitability over the spinal cord.
- Stage 3: Peak spasticity; synergies are voluntary but obligatory. Patient can fire flexor or extensor synergy on command but cannot move outside the template. Reaching to grasp is impossible because reach uses extensor components (elbow extension, scapular protraction) and grasp uses flexor components (finger flexion). The two macros cannot be combined. Common permanent plateau, rehab pivots from restoration to compensatory one-handed strategies, adapted equipment, and contracture prevention in the spastic muscles.
- Stage 4: Out-of-synergy movements begin; spasticity declines. Hand-behind-back (shoulder extension + internal rotation + elbow flexion) and shoulder flexion to 90° with elbow extended are the classic milestones, both require combinations that don’t belong to either pure synergy. Movements are fragile: the patient performs them in a quiet therapy room then reverts to synergy under fatigue, cognitive load, or stressful task demands. Variability across the day is itself a stage-4 hallmark and distinguishes it from stage 5.
- Stage 5: Independence from synergy templates. Reliable selective joint control: elbow flexes without shoulder activation, palm turns up with elbow extended, individual fingers move with reasonable precision. Spasticity persists only with rapid movement or stress. Bimanual ADLs become possible, stabilizing a fork while the intact hand cuts, holding paper while writing, assisting with dressing. Lower extremity gains independent knee flexion during swing phase, replacing the obligatory hip-hike circumduction. CIMT threshold.
- Stage 6: Near-normal; spasticity essentially gone. Smooth isolated joint movements; subtle deficits on rapid-alternating fine motor testing only.
- Stage 7: Normal. No detectable difference between affected and unaffected sides on careful examination. Achieved by a minority of stroke patients, typically those with small infarcts and minimal initial impairment.
The biology behind why spasticity is a recovery sign and not a regression is worth holding: the healthy cortex’s primary motor role is inhibition of older subcortical pattern generators. When cortex is offline, brainstem circuits (reticulospinal, vestibulospinal) are released from inhibition and dominate the motor output as crude bundled macros. Spasticity at stage 2 means signal is reaching the spinal cord again; the synergies are simply the only language the unsupervised brainstem speaks.
Stage 1 is not pure structural damage. Diaschisis is an active state of metabolic suppression in surviving neurons in the penumbra and in distant connected regions. The infarct core releases a chaotic glutamate wave; surviving neurons downregulate receptors and enter metabolic hibernation to survive the excitotoxic shock. Days to weeks later the chemical environment stabilizes, hibernation lifts, and the patient transitions to stage 2.
Clinical Pearl — Bobath vs Brunnstrom philosophy
Bobath (NDT) seeks to suppress primitive reflexes and synergies and re-educate normal movement; Brunnstrom uses the synergies as scaffolding because normal movement may never return. The two approaches were direct competitors in the 1960s and the boards reliably ask candidates to contrast them.
Board Trap — “Spasticity worsening = recovery worsening”
Wrong: the emergence of spasticity in stage 2 is a positive prognostic sign, signaling that descending pathways are reconnecting. The terrifying clenched arm is the first measurable proof of life.
High Yield — Brunnstrom in 7 lines
- Stage 1 flaccid, subluxation risk peaks here.
- Stage 2 spasticity appears, synergies involuntary, good sign.
- Stage 3 peak spasticity, synergies voluntary but locked, common plateau.
- Stage 4 out-of-synergy begins, fragile.
- Stage 5 out-of-synergy reliable, CIMT threshold.
- Stage 6 near-normal, subtle fine-motor deficits.
- Stage 7 normal: minority of patients.
They do not understand how to bend an elbow without also shrugging a shoulder. They rely on bundled, hardwired mass movement patterns known as synergies. It is the biological equivalent of a computer macro. You program a single key to execute a massive sequence of actions.
— CVA-06 podcast, ~10:30