Motor compensation and recovery for reaching in stroke patients.
OBJECTIVE
To examine the mechanisms of alternative strategies developed by stroke patients to compensate their motor impairment and their role in recovery.


METHODS
The three-dimensional kinematics of the upper limb were quantified during unconstrained reaching movements in seven healthy individuals and in 15 stroke patients. Nine patients were followed-up. Individual observations were correlated with anatomical and functional brain imaging described elsewhere (Feydy et al. Stroke 2002;33:1610).


RESULTS
Healthy subjects used mainly elbow extension and shoulder flexion, scaled to movement distance. Patients with hemiparesis because of stroke used different patterns of joint recruitment with different scaling rules. Patients with the greatest impairment compensated by recruiting extra degrees of freedom, particularly trunk bending. Improvement was because of a restoration towards a normal movement pattern (recovery) and/or to a reinforcement of compensation, which led to a poorer outcome.


CONCLUSIONS
Individual behavioural data are necessary to discuss the mechanisms of functional improvement following stroke with respect to recovery and/or compensation.
Roby-Brami
A
A
CNRS UMR 8119, University Paris V, Paris, France. agnes.roby-brami@biomedicale.univ-paris5.fr
Feydy
A
A
Combeaud
M
M
Biryukova
E V
EV
Bussel
B
B
Levin
M F
MF
D000328:Adult; D000368:Aged; D001696:Biomechanical Phenomena; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007596:Joints / Q000503:physiopathology; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D009068:Movement; D011187:Posture; D011597:Psychomotor Performance; D020521:Stroke / Q000503:physiopathology / Q000523:psychology; D000071939:Stroke Rehabilitation