Table 1: Rating criteria for single leg squat: good and poor stability.

Single Leg Squat

GoodPoor

1. Overall Impression
Smooth, good-quality movement
General control
Controlled change-over between repetitions
Ease of movement
Staggered movement
Increased speed to attempt to control movement
Effort to control movement
Trunk “wobble”

2. Weight Transfer
Minimal translation of centre of mass
Upright trunk
Discernible translation of centre of mass
Trunk leaning forward or to side
Extended time to transfer

3. Lumbar Spine & Pelvic Alignment
Minimal movement in all three planes
Frontal plane: ASIS level
Sagittal plane: minimal A-P tilt, rotation
Lateral view: stable lordosis, minimal trunk flexion
Discernible movement with pelvis tilting up or down, rotating toward or away from weightbearing leg, tilting in anterior or posterior direction
Lumbar lordosis increasing or trunk flexion occurring

4. Leg Alignment
Minimal movement out of the starting plane of movement. This takes into account the alignment of the limb, influenced by pelvic width, and Q angle at the kneeDiscernible movement out of the starting plane of movement

5. Foot Alignment
Neutral foot position—remains stable during movementExcessive pronation of foot during squat descent
Externally rotated starting position of lower leg/foot