The role of gait analysis in the management of the knee.

Gait analysis has been used as an investigative tool for locomotion disorders since the early 20th century when it was done using time-lapsed photography. Since the advent of video and advances in strain gauge technology and fast data-handling devices coupled with computers, many of the movements and forces acting on and around the knee can now be measured with a high degree of accuracy. The magnitude and position of the force in 3-dimensional space can be accurately determined relative to the anatomy of the knee, consequently the clinician can assess and evaluate the forces and movements of the structures around and within the knee. This information can help the clinician predict and monitor post-surgery changes to the anatomy of the knee, and the forces and movements on these structures.