Baizabal-Carvallo JF, et al. - In 52 patients suffering from Parkinson′s disease (PD), authors investigated the degree of flexion of the 2nd metacarpophalangeal (MCP) joint, with the aid of high-resolution photographs taken from the radial aspect of each hand (n=104 hands) to assess the pathogenesis and clinical associations of Hand deformities in PD. Assessment of classical striatal hand deformity (CSHD) was also done, which was defined as the MCP flexion, proximal interphalangeal joint extension, and distal interphalangeal joint flexion. The most common hand deformity in PD was MCP joint flexion which was clinically correlated with rigidity and bradykinesia. A CSHD was associated with a younger age onset of PD only. Dyskinesia, levodopa-dose, nor cognitive dysfunction were indicated by these hand deformities.