Step 1: Determinants of gait.
Gait is influenced by various mechanical factors that allow for efficient and controlled movement. The primary determinants include pelvic tilt, knee extension, and pelvic rotation. These factors help to maintain balance and minimize energy expenditure during walking.
Step 2: Analyzing the options.
- (1) Pelvic tilt: This is a determinant of gait as it facilitates proper leg swing and helps with balance.
- (2) Knee extension in stance phase: Knee extension in the stance phase provides stability and control during walking.
- (3) Pelvic rotation: The rotation of the pelvis is important for smooth gait and efficient stride length.
- (4) Foot and knee mechanisms: While foot and knee mechanics are important in gait, they are not considered determinants. Determinants are specifically factors that influence energy efficiency and stride length.
Step 3: Conclusion.
Therefore, the correct answer is (4), as foot and knee mechanisms are not considered primary determinants of gait.