The problem that troubles many patients with a moderate stroke most, and that they most often search for online, is a hand that can grip tightly but cannot let go. The fingers can bend into a fist but cannot be opened voluntarily, and the patient may not even be able to put down a cup. This is not simply a matter of weakness. The core problem of the upper limb in a moderate stroke is loss of selective control, where the flexor muscles are too strong and the extensor muscles do not cooperate. The encouraging part is that this "release" movement, the hardest to master, is also the strongest predictor of whether the hand will regain dexterity. Whether the fingers can extend early after a stroke almost decides the later function of the hand. Starting from "can grip but cannot release", this article looks at the core elements of upper limb physiotherapy for moderate stroke: grasp and release, breaking synergy patterns (recalibrating rather than eliminating them), dexterity and task-oriented training, advanced therapies with clinical evidence (CIMT, mirror therapy, FES), strengthening, and the most often neglected factor, enough training volume.
Why can the fingers grip but not release? What finger extension means for recovery
The most typical hand problem after a stroke is being able to grip but not to release. Gripping depends on the finger flexors, and after a stroke the flexor tone is often high and overactive. By contrast, the finger extensors, which open the hand, are weak and hard to start, and the fingers end up curled into a ball and unable to loosen. The focus of training at this stage is therefore not only to "build strength" but, more importantly, to relearn "relaxing and extending". If the patient also has numbness or reduced sensation in the hand, so that it is unclear where the hand is and releasing is harder, it is usually advised to deal with the sensory problem at the same time. For details see managing numbness and sensory loss in the hand.
Why is this movement so important? Because "whether the fingers can extend" is the single strongest predictor of outcome after a stroke. A follow-up study found that if patients could extend the fingers voluntarily and abduct the shoulder within 72 hours of the stroke, the probability of regaining hand dexterity at 6 months was as high as 0.98. For patients who could not do this, the probability was only 0.25. In addition, among patients who could already extend the fingers early, about 60% eventually reached full recovery on the arm function test (ARAT) (Nijland et al., 2010). In other words, whether the fingers can "release" is more than a single movement. It is a recovery signal that can be measured and gives hope.
Finger extension and hand recovery
- With voluntary finger extension plus shoulder abduction within 72 hours, the probability of regaining dexterity at 6 months was 0.98; without it, only 0.25 (Nijland et al., 2010)
- About 60% of patients who could extend the fingers early eventually reached full recovery on the ARAT test
- Even a very small range of extension at present is a positive sign and worth working on actively
- The aim of training is to build the weak extension movement step by step into a release movement that can be used in daily life
Grasp and release
Practise picking up an object and then slowly opening the fingers. The core of training is the "release", and not just the "grasp".
- 1Gripping a large objectStart with a large soft ball or towel to build a steady grip.
- 2Practising releaseConcentrate on slowly opening the fingers. This is the most important step.
- 3Smaller objectsMove gradually to smaller objects to make the training harder.
- 4Placing accuratelyPut the object in a set place, so that "letting go" becomes a movement with a clear target.
The hardest step:for many patients, "letting go" is much harder than "holding on". The physiotherapist teaches the patient to use wrist extension (bending the back of the hand upwards) to bring the fingers open naturally. This is a practical helping technique and also helps trigger contraction of the muscles that extend the fingers.
Breaking synergy patterns: learning to move the joints separately
Many patients shrug the shoulder without realising it when they raise the arm, and the whole arm pulls in when the elbow bends. This is called a synergy pattern. Because it is hard for the damaged brain to control each joint finely and separately, it uses fixed "batch commands" to start a whole group of muscles at once.
One point needs to be understood accurately. A synergy pattern is not eliminated but recalibrated. When researchers analysed the recovery of people with chronic stroke, they found that improvement in movement came from the adjustment and gain of the existing abnormal synergies and from better independent control of the shoulder and elbow, and not from wiping out the old pattern completely (Dipietro et al., 2007). The aim of training is therefore not to "remove" a pattern but to relearn separating the movements of the individual joints on the basis of what already exists. Achieving this takes a large amount of repeated task practice with a clear goal (French et al., 2016).
Isolation movement training
Learn to control each joint independently, gradually breaking up "the whole arm moves together" into "moving a particular joint at will".
Separating shoulder and elbow
- Practise raising the arm while keeping the elbow straight
- Keep the elbow straight and do not bend it
- Keep the shoulder relaxed and avoid shrugging
- Slowly raise the arm forward or to the side
- The physiotherapist helps hold the parts that should not move
- Corrects the problem of shrugging as soon as the arm is raised
Bending the elbow on its own
- Bend the elbow with the shoulder relaxed and not shrugging
- Keep the shoulder relaxed and hanging naturally
- Bend only the elbow, without pulling the shoulder up with it
- While practising, stand with the back against a wall and the back flat on it
- Make sure only the joint being trained is moving
- Corrects the whole arm pulling in as soon as the elbow bends
Reducing abnormal muscle tightness:the physiotherapist places a hand on the patient's shoulder to stop the patient shrugging, and guides the patient to concentrate on reaching the arm out, which corrects the bad habit of using other parts to help. This training needs a lot of repetition, so that on top of the old pattern where the whole arm moves together, the brain gradually recalibrates a finer movement that can be controlled separately.
Fine movement and finger dexterity training
The core value of the hand is "handling objects". Once grasp and release become steadier and more controlled, the next step is to train control of fingertip force and coordination. This kind of highly repetitive task practice is the key to improving upper limb function and self-care in daily life (French et al., 2016). To judge force accurately and complete a fine grip, besides muscle control the fingertips also need clear touch sensation. Dexterity training is therefore usually done together with touch discrimination training, and with stereognosis training, in which the patient tells shape and size by feel alone with the eyes closed or without looking at the object.
Finger touching
- Use the thumb to touch the index, middle, ring and little fingers one after another
- Then reverse the order from the little finger back to the index finger
- Gradually speed up the movement while keeping it accurate
Therapy putty
- Use Theraputty therapy putty to practise pinching, kneading and pressing
- Putty of different firmness gives different training intensity
- Press with a single finger, or practise gripping with the whole palm
Handling small objects
- Picking up coins, marbles and beans
- Stacking cups and building blocks
- Practising doing up buttons and zips
Task-oriented and bilateral coordination training
Building movement training into real-life situations helps the brain get used to "applying" the affected hand in daily life. Rehabilitation training is more than exercise. It is a return to normal life. Repeated practice through actual daily tasks is recognised as one of the most effective ways to train the upper limb (French et al., 2016; Pollock et al., 2014).
Bilateral integration
Bring the affected hand back into daily activities. Even a supporting role is important.
Supporting role
- Hold the paper down with the affected hand while the unaffected hand writes
- Steady the rice bowl with the affected hand while the unaffected hand holds the chopsticks
- Hold the bottle firmly with the affected hand while the unaffected hand unscrews the cap
- Hold the cloth flat with the affected hand while the unaffected hand folds the clothes
Symmetrical movements
- Wipe the table holding a towel with both hands
- Push against a wall with both hands for a stretch
- Hold a ball in both arms and turn the body from side to side
- Hold a steering wheel with both hands to imitate driving movements
How to see bilateral training: research has not yet shown that training both hands together is necessarily better than usual care or other upper limb treatment (Coupar et al., 2010). The real value of this training is therefore not a stronger treatment effect but keeping the affected hand in daily activities and stopping the brain forgetting how to use it (that is, avoiding learned non-use). Clinically, it is a way of encouraging the patient to use the affected hand more.
Real daily-life practice
Build rehabilitation training into real life.
Exercise 1: lifting a cup to drink
- Practise gripping the cup
- Control the angle at which the arm is lifted
- Put the cup down smoothly without spilling
Exercise 2 · Combing hair
- Practise raising the arm above the head
- Control the back-and-forth movement of the hand
- Work on the range of movement of the shoulder joint
Exercise 3 · Turning a door handle
- Practise gripping and turning the wrist
- Control the force used to push and pull the door
- Work on the flexibility of the wrist
The benefit of home visit therapy: when the patient practises these movements at home, the patient can use the cup, comb and door handle normally used. This matches the real needs of daily life better than imitating them in a treatment room, and the skills learned can be used in daily life straight away.
Advanced therapies with research evidence: CIMT, mirror therapy and FES
Once the affected hand has regained a certain amount of active movement, several advanced therapies with stronger clinical evidence can be considered. A Cochrane review found that high-dose repetitive task practice, CIMT, mental practice and mirror therapy all have moderate-quality positive evidence for improving upper limb function (Pollock et al., 2014). The three therapies below are especially worth considering for patients with a moderate stroke. Readers can also see the overview of upper limb and hand function rebuilding to understand the whole recovery path.
Constraint-induced movement therapy (CIMT)
- The unaffected hand is restricted, which forces the patient to practise daily movements intensively with the affected hand
- Needs some active extension: about 20° or more at the wrist and 10° or more at the fingers (NICE NG236)
- EXCITE trial: a two-week programme improved use and speed of the affected hand, maintained to one year (Wolf et al., 2006)
- Overall upper limb motor function SMD 0.34, significant but moderate (Corbetta et al., 2015)
Mirror therapy
- A mirror is placed in the middle of the body with the affected hand hidden behind it, and the eyes watch the unaffected hand's movement reflected in the mirror
- This gives the brain the illusion that the affected hand is moving, which stimulates the motor areas of the brain
- Positive effect on motor function (SMD 0.47; Thieme et al., 2018)
- It also helps improve hand and leg function, raise self-care in daily life and reduce pain
FES compared with exercise training alone: functional electrical stimulation (FES) delivers current at the moment the patient tries to move, helping the muscle contract and linking the brain's intention to move with the actual movement. A meta-analysis showed that FES can improve activity and function after a stroke, and that its effect is better than exercise training alone (Howlett et al., 2015; for details see the evidence on functional electrical stimulation for the hand and leg). For the problem of "can grip but cannot release", FES is especially suited to triggering movement of the wrist and finger extensor muscles.
How FES works: intention, movement and feedback
It helps the brain relearn to send movement commands.
- 1IntentionThe patient actively thinks of, and tries to make, the gripping or hand-opening movement.
- 2Electrical stimulationThe device delivers current at the right moment to help the target muscle contract.
- 3MovementThe movement is completed, giving the brain the successful experience that "if I intend to move, I can move".
FES compared with conventional electrical therapy: conventional neuromuscular electrical stimulation (NMES) is mostly passive, using current alone to make the muscle contract. FES requires the patient to try actively to produce force, and the current steps in to help only at the moment the patient intends to move. This cycle of intention, movement and feedback is the key to rebuilding nerve connections, and explains why clinical evidence shows FES works better than exercise training alone (Howlett et al., 2015).
Strengthening and proprioceptive neuromuscular facilitation (PNF)
Strengthening specific weak muscle groups (especially the extensors) helps with an arm that droops weakly or trembles. A common misunderstanding is that "strength training makes spasticity worse". In fact, a systematic review has shown that strength training increases muscle strength and improves activity after a stroke, and that it does not make spasticity worse (Ada et al., 2006). Moderate resistance training is therefore both safe and good for recovery.
Key muscle groups to strengthen
- Deltoid: improves the ability to raise the arm
- Triceps: improves the strength of elbow extension
- Wrist extensors: counter wrist drop
- Finger extensors: improve control of grip and release
Training tools
- Resistance bands (Theraband): different colours mean different resistance
- Light dumbbells: start at 0.5–2 kg
- Hand grip trainers: strengthen the fingers and palm
- Sandbags: progressive loading
Training principles: start with light resistance and increase step by step as progress allows. Always watch the quality of movement and do not use wrong posture to cheat. Do 10–15 repetitions per set and 2–3 sets a day. If the patient feels too tired or has pain during training, stop at once and ask the physiotherapist.
Proprioceptive neuromuscular facilitation (PNF)
PNF is a facilitation technique in which the physiotherapist applies resistance and guidance by hand. Clinically, rhythmic stabilization and slow reversal techniques are often used, aiming to make movement smoother and steadier and to reduce stopping, sticking or tremor. It must be said objectively that high-quality randomised controlled evidence supporting PNF for upper limb rehabilitation is still limited. A more appropriate position is therefore to treat it as a supporting technique that the therapist applies on clinical judgement to improve the quality and steadiness of movement, and not as a stand-alone core treatment. The main lines of rehabilitation with strong evidence remain repetitive task practice, CIMT, mirror therapy and FES.
Rhythmic stabilization
- Increases the stability of the joint
- The physiotherapist applies resistance from different directions
- The patient holds the arm position steady
- Trains the ability of different muscles to contract together to steady the joint
- Improves arm tremor and instability
Slow reversal
- Improves the smoothness of movement
- The arm moves back and forth within a set range
- The physiotherapist applies suitable resistance during the movement
- Focuses on whether the movement is continuous and controlled
- Makes the movement smoother and more natural
Training volume, frequency and the benefits of home training
However good the treatment method, it is hard to see results if the amount of training is too small. Upper limb rehabilitation is a dose-driven process. The NICE clinical guideline recommends multidisciplinary therapy of at least 3 hours a day on at least 5 days a week, with high-dose repetitive task practice at the core (NICE NG236). International guidance also agrees that rehabilitation training must be high-intensity, task-specific and highly repetitive(Winstein et al., 2016). Research also shows that the benefit of repetitive task training is directly linked to the training "dose" (French et al., 2016).
Why it is easier to reach enough repetitions when training at home: reaching the training volume recommended in clinical guidance is not possible from sessions in a treatment room alone. More important is to keep practising in daily life every day. When the patient repeats exercises at home with the cup, comb and door handle normally used, the practice matches real daily needs and also fits into the daily routine more easily, building up enough repetitions. This is the main benefit of home physiotherapy.