Progress and Prospects in Parkinson's Research/Symptoms/Flexion

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Flexion
Bent or curved posture

The following references are relevant:-

Hong and Earhart (2010) Effects of Medication on Turning Deficits in Individuals with Parkinson's Disease 

Mak et al (2011)  Limb Collapse, Rather Than Instability, Causes Failure in Sit-to-Stand Performance Among Patients With Parkinson Disease 

Xia et al (2011) Differentiation between the contributions of shortening reaction and stretch-induced inhibition to rigidity in Parkinson’s disease