Correction: The biomechanics of knuckle-walking: 3-D kinematics of the chimpanzee and macaque wrist, hand and fingers

There was an error published in Journal of Experimental Biology (2020) 223, jeb224360 (doi:10.1242/jeb.224360).The description the calculation metacarpophalangeal (MCP) joint abduction and adduction incorrect. It originally described as angle between metacarpal projection phalangeal vector onto plane best fit metacarpals. This not case. The MCP adduction/abduction calculated 3-D projected sagittal (gray Fig. 2) describing actual position phalanges. is sensitive to changes flexion extension, whereas actually used not. No data, analyses or conclusions are changed a result this; only Materials Methods representation this 2 were incorrect.The corrected text (third last sentence ‘Metacarpophalangeal motion’) reads: ‘Adduction markers (vpp_proj 2C,D) defining each phalanx. returns value for that insensitive degree extension.’The original versions shown below. Both online full-text PDF article have been updated.The authors apologise readers any inconvenience caused thank Dr Joris Leijnse identification error.Fig. 2. (corrected). Forearm, hand coordinate systems marker sets right side dorsal view. Marker locations Table S1. (A) red those define forearm (Xf, Yf Zf) (Xh, Yh Zh) system (black arrows). Dashed arrows represent vectors help orient system. Pink additional calculate wrist motion, but (B) nmc normal all eight landmarks (white plane; B). For digit, perpendicular this, oriented along metacarpal's base head landmark, describe B C, second metacarpal). (C) (–; deg) extension (+; deg). (D) Adduction (vpp_proj) plane) phalanges.Fig. (original). metacarpals