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Drop Vertical Jump

Sarah Johnson · recorded Jun 14, 2026 · box height 30 cm · 3 of 4 trials valid

Movement-screening output. Interpret with clinical history, strength testing, symptoms, and other assessments.
DVJ Frontal Error Subscore
2/ 6

Project-specific frontal-plane subscore. This is NOT the LESS-RT.

LESS-RT (real-time)
7/ 15

10-item Landing Error Scoring System — Real Time; total range 0–15.

Movement events

Event order must be valid for a trial to be scored

Initial contact
0.95
Maximum knee flexion
0.89
Rebound take-off
0.86
Second contact
0.82
Stabilization
0.71
TrialsMinimum valid trials · 3
  • Trial 1
    Event order valid
    Valid
  • Trial 2
    Event order valid
    Valid
  • Trial 3
    Rebound take-off detected before maximum flexion — trial excluded
    Excluded
  • Trial 4
    Event order valid
    Valid
Analysis quality
Scorable with caution
Scorable with caution

Scores are shown but one or more quality checks were degraded. Confirm flagged items before acting on the output.

  • Protocol validity
    Box height annotated (30 cm), 3 of 4 trials valid
  • Required views
    Front + side view present — full 10-item LESS-RT available
  • Landmark visibility
    Knee and ankle landmarks visible in 97% of scored frames
  • Event-order confidence
    Trial 3 rejected on event order; stabilization confidence 0.71
  • Frame rate
    120 fps — suitable for impact-phase kinematics
Missing or low-confidence inputs are reported as Not scorable — never imputed as zero.
Frontal-view criteria (0–6)

5 frontal criteria · project-specific subscore, not the LESS-RT · confirm or override each item

ItemPlaneSuggestedFrame referenceConfidenceClinician review
Stance widthFrontal view0 / 1Initial contact · frontconf 0.91
Foot rotationFrontal view0 / 1Initial contact · frontconf 0.84
Initial contact symmetryFrontal view1 / 1Initial contact · frontconf 0.69
Maximum knee valgusFrontal view1 / 2Max flexion · frontconf 0.72
Lateral trunk flexionFrontal view0 / 1Max flexion · frontconf 0.86
LESS-RT criteria (10 items, total 0–15)

5 frontal + 5 sagittal criteria · sagittal criteria require the side view

Scoring available
ItemPlaneSuggestedFrame referenceConfidenceClinician review
Stance widthFrontal view0 / 1Initial contact · frontconf 0.91
Foot rotationFrontal view0 / 1Initial contact · frontconf 0.84
Initial contact symmetryFrontal view1 / 1Initial contact · frontconf 0.69
Maximum knee valgusFrontal view1 / 2Max flexion · frontconf 0.72
Lateral trunk flexionFrontal view0 / 1Max flexion · frontconf 0.86
Initial foot contact patternSagittal view1 / 1Initial contact · sideconf 0.83
Knee-flexion displacementSagittal view1 / 2Max flexion · sideconf 0.90
Trunk-flexion displacementSagittal view1 / 2Max flexion · sideconf 0.87
Total sagittal joint displacementSagittal view1 / 2Max flexion · sideconf 0.76
Overall impressionSagittal view1 / 2Full trial · sideconf 0.70
Continuous metrics

Median and range across valid trials. Descriptive only — no cut-offs applied.

MetricValueTrial medianTrial rangeReference
Peak knee flexion
bilateral
71.4°71.466.2 – 78.1Median of 3 valid trials
Normalised knee separation
bilateral
0.82ratio0.820.76 – 0.88Knee width ÷ ankle width at maximum flexion
Trunk flexion at max knee flexion
bilateral
24.8°24.821 – 29.6Median of 3 valid trials
Rebound jump height
bilateral
27.6cm27.625.1 – 30.2Scaled from annotated box height (30 cm)
Landing loading asymmetry
bilateral
9.2%9.25.4 – 13.8Descriptive only — kinematic proxy, not force data
Session history

Lower scores indicate fewer errors

  • Apr 02, 2026Frontal 5/6 · LESS-RT 9/15
  • May 08, 2026Frontal 4/6 · LESS-RT 8/15
  • Jun 14, 2026Frontal 2/6 · LESS-RT 7/15
The frontal subscore and LESS-RT are separate instruments and must not be summed or compared to one another.