Legdriven

Legdriven is an adjective used to describe propulsion or operation that is powered by the legs. It is not a formal technical term with a single universal definition, but it is used across biomechanics, sports science, and robotics to distinguish leg-based locomotion from mechanisms powered by wheels, tracks, or external energy sources.

In biomechanics and gait analysis, leg drive refers to the contribution of the legs to forward propulsion during walking or running. It involves coordinated activation of the hip, knee, and ankle joints and the ground reaction forces produced during foot contact. In sport contexts, leg drive is a factor in acceleration, sprint performance, and jumping, reflecting how effectively a athlete can push off the ground and redirect momentum.

In robotics and prosthetics, leg-driven locomotion refers to systems that advance primarily through leg actuation. Design considerations include actuator strategy, energy efficiency, control of balance and contact with irregular terrain, and the storage and release of energy through compliant joints or elastic elements. Leg-driven robots, such as bipeds and quadrupeds, are often contrasted with wheeled or tracked platforms, offering advantages on uneven surfaces at the cost of higher control complexity and energy demands.

Terminology: leg-driven, with a hyphen, is the more common standard form in technical writing; legdriven (unhyphenated) appears in branding or informal usage. The term is context-dependent and may be used as a shorthand for leg-powered propulsion in specific fields.

See also legged locomotion, gait analysis, prosthetics, walking robot.