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Table 1 Hoehn and Yahr Scale for Parkinson’s disease

From: Functional outcomes after total joint arthroplasty are related to the severity of Parkinson’s disease: a mid-term follow-up

StageHoehn and Yahr Scale
IUnilateral involvement only
IIBilateral involvement without impairment of balance
IIIMild to moderate bilateral disease; some postural instability; physically independent
IVSevere disability; still able to walk or stand unassisted
VWheelchair bound or bedridden unless aided