Interpretation of Landing Error Scoring System (LESS) Test Results

For a comprehensive evaluation of jumping function, corrective training experts invented the Landing Error Scoring System (LESS) test. The implementation steps of this method are not complicated: the subject stands on a 30CM high jump box, draws a target line at 1.5 times the height before the box jump, jumps from the jump box to the target line, and then immediately jumps in place (the speed of the entire action is It is relatively fast, generally recording at about 2.5 meters in front of the right and using image data for evaluation). The steps of the
LESS test are not complicated, and the evaluation method is only based on the characteristics of movements. However, many people in the industry seem to have insufficient understanding of the questionnaire and evaluation criteria of the LESS test.

LESS Test Questionnaire and Evaluation Criteria
The answer and score correspondence are attached in the following questionnaire. The 15 questions, answers and analysis are as follows for your reference and discussion.
1. After jumping from the jump box, from the moment when you just landed to the completion of the landing action, whether the flexion of the knee joint is less than 30 degrees. No = 0 points, yes = 1 point. Insufficient knee flexion indicates insufficient eccentric contraction.
2. After jumping from the jump box, from the moment when you just landed to the end of the landing, whether the flexion of the knee joint exceeds 45 degrees. No = 0 points, yes = 1 point. Excessive knee flexion indicates inefficient eccentric contraction.
3. Knee valgus when jumping off the box and landing (the midline of the knee is in the midline of the foot). No = 0 points, yes = 1 point (there should be no knee valgus).
4. When jumping from the jump box and landing, the knee moves outward (whether the midline of the knee joint is beyond the big toe). No = 0 points, Yes = 1 point (there should be no knee lateral shift).
5. Whether the torso is flexed when landing. Yes = 0 points, No = 1 point. Trunk flexion is a necessary eccentric decompression function, and failure to perform this function may be abnormal.
6. Whether the torso is flexed sideways when landing. No = 0 points, yes = 1 point. Lateral flexion of the trunk is obviously not supposed to occur.
7. The situation of foot landing when touching the ground.Gradual landing from the toes to the heel = 0 points, otherwise = 1 point; the former is more conducive to the cushioning function of the arch, and it also indicates that the eccentric contraction function of the relevant muscles is normal.
8. When jumping from the jump box and landing, whether the external rotation of the foot is greater than 30 degrees. No = 0 points, yes = 1 point. External rotation of the foot is okay, but it is obviously a problem if the amplitude is too large.

9. When jumping from the jump box and landing, is the foot pronation greater than 30 degrees. No = 0 points, yes = 1 point. Pronation of the foot is also possible, but if the amplitude is too large, there is obviously a problem.
10. When jumping from the box and landing, check whether the distance between your feet exceeds shoulder width. No = 0 points, yes = 1 point. Too much distance between the feet indicates that there may be compensation in the hip adductors.
11. When jumping from the box and landing, check whether the distance between your feet is less than your shoulder width. No = 0 points, yes = 1 point. Too little distance between the feet indicates a possible deficit in hip abductor strength.
12. Whether the posture of the feet is symmetrical when jumping from the box and landing. Yes = 0 points, No = 1 point. This is easy to understand.
13. After jumping from the jump box, the knee and hip joints should be flexed simultaneously to achieve eccentric contraction; after the knee joint flexion movement stops, whether the hip joint still flexes. No = 0 points, Yes = 1 point (eccentric contractions should be synchronized, and eccentric contractions of the hips should not take precedence over the knees).
14. Is the hip flexed when jumping from the box and landing? Yes = 0 points, No = 1 point (testing the neuromuscular coordination of the hip).
15. The displacement amplitude of the body on the sagittal plane after the first landing. Less = 0 points, yes but normal = 1 point, large displacement = 2 points.
16. Overall impression. Good = 0 points, Fair = 1 point, Poor = 2 points.

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