Step 1: Determinants of gait.
Gait determinants are factors that influence and determine the efficiency and smoothness of movement during walking. They include pelvic tilt, knee extension, and pelvic rotation. These factors help maintain proper posture and balance during movement.
Step 2: Analyzing the options.
- (1) Pelvic tilt: Correct. Pelvic tilt helps in maintaining balance and efficient leg swing.
- (2) Knee extension in stance phase: Correct. Knee extension helps provide stability during the stance phase of walking.
- (3) Pelvic rotation: Correct. Pelvic rotation helps lengthen the stride and allows for smooth movement.
- (4) Foot and knee mechanisms: Incorrect. These are involved in the actual movement of the leg but are not primary determinants of gait.
Step 3: Conclusion.
Therefore, the correct answer is (4), as foot and knee mechanisms are not considered primary determinants.