Table 5.
Countermovement Jump with Landing Error Scoring System (LESS) analysis and number of athletes having the error condition per LESS item.9
| LESS item (filmed in sagittal/frontal plane) | Error descriptor | Error descriptor seen on operated leg, N (%) | Error condition seen on non-operated leg, N (%) |
|---|---|---|---|
| Knee flexion angle at initial contact (sagittal) | Knee flexion < 30 ° | 80(51) | |
| Hip flexion angle at initial contact (sagittal) | Thigh is in line with the trunk | 10(6) | |
| Trunk flexion angle at initial contact (sagittal) | Trunk is vertical on the hip | 47 (30) | |
| Ankle plantarflexion angle at initial contact (sagittal) | Foot lands heel to toe or flat | 6(4) | |
| Knee valgus angle at initial contact (frontal) | Line straight down from centre of the patella is medial to the midfoot | 53 (34) | 58 (37) |
| Lateral trunk flexion angle at initial contact (frontal) | Midline of the trunk is to the left or right side of the body | 82 (52) | |
| Stance width - wide (frontal) | Line straight down from the tip of the shoulder is inside the foot | 19(12) | 16(10) |
| Stance width - narrow (frontal) | Line straight down from the tip of the shoulder is outside the foot | 36 (23) | 36 (23) |
| Foot position - toe in (frontal) | Internal rotation of foot >30 ° | 0(0) | 0(0) |
| Foot position - toe out (frontal) | External rotation of foot >30 ° | 0(0) | 1(1) |
| Symmetric initial foot contact (frontal) | One foot lands before the other | 69 (44) | |
| Knee flexion displacement (sagittal) | Knee flexion displacement < 45 ° | 32 (20) | |
| Hip flexion at max knee flexion (sagittal) | Thigh does not flex more on the trunk during landing | 12(8) | |
| Trunk flexion at max knee flexion (sagittal) | The trunk does not flex more during landing | 23 (15) | |
| Knee valgus displacement (frontal) | Line straight down from center of the patella is medial to the great toe during max knee valgus | 88 (56) | 81 (51) |