Dynamic posturography in evaluation of balance in patients of Parkinson's disease with normal pull test: concept of a diagonal pull test.
OBJECTIVE
To assess subclinical balance impairment in patients of Parkinson's disease (PD) with normal "pull test", using dynamic posturography.


METHODS
Twenty PD patients (H&Y stage 2) and 20 matched healthy controls were studied. The patients were evaluated in best 'ON' state using UPDRS and Dynamic Posturography. The latter measured dynamic balance indices and limits of stability (LOS) in 8 directions: forward (FW), backward (BW), right (RT), left (LT), forward-right (FW-RT), forward-left (FW-LT), backward-right (BW-RT) and backward-left (BW-LT).


RESULTS
The dynamic balance indices and total LOS scores did not differ significantly between PD and controls. Direction-wise analysis of LOS showed significantly lower scores (suggesting impaired balance) in PD compared to controls only in FW-RT (21.2 ± 13.8 vs 34.5 ± 17.5, p=0.005) and BW-LT (20.8 ± 9.8 vs 31.8 ± 15.1, p=0.018) directions. In LOS test, controls had better stability in FW than BW (p=0.002) and on RT than LT directions (p=0.0005). Analysis in diagonal directions showed greater stability in FW-RT than FW-LT, in BW-LT than BW-RT, in FW-RT than BW-RT, and BW-LT than FW-LT directions. Though PD patients maintained greater stability in FW direction like controls, they lost the advantage in other directions.


CONCLUSIONS
Despite normal "pull test", PD patients had subclinical direction-specific balance impairment, more apparent in forward-right and backward-left directions. This information may be useful in modifying the standard "pull test" with addition of pull in diagonal directions for detection of early balance impairment.
Ganesan
Mohan
M
Department of Neurophysiology, National Institute of Mental Health & Neurosciences, Bangalore 560029, India.
Pal
Pramod Kumar
PK
Gupta
Anupam
A
Sathyaprabha
Talakad N
TN
D000368:Aged; D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D005069:Evaluation Studies as Topic; D005260:Female; D020233:Gait Disorders, Neurologic / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D026201:Musculoskeletal Manipulations / Q000379:methods*; D009460:Neurologic Examination / Q000379:methods; D010300:Parkinson Disease / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D004856:Postural Balance / Q000502:physiology*; D012720:Severity of Illness Index; D013223:Statistics as Topic; D016896:Treatment Outcome