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Table 2 Scorings system Jump-landing Technique (JLS-system)

From: Efficacy of a 3 month training program on the jump-landing technique in jump-landing sports. Design of a cluster randomized controlled trial

Front view
(observers view)
Criteria Description Observation Measurement Score
Maintaining 'balance'
- Loss of balance
Lifting one foot or toes of both feet due to falling. Observe complete jump Loss of balance present or not Loss of balance not present or doubt: 0
Loss of balance present: 1
- Centre of gravity displacement   At first foot contact:
Perpendicular through incisura jugularis
At maximal knee flexion determine the position of incisura jugularis (left/right) compared to perpendicular Displacement not present or doubt: 0
Displacement left or right: 1
Landing with 'both feet at the same time' Not simultaneous:
obviously 2 contact times of the feet visible
Observe complete jump Simultaneous landing present or not Simultaneous landing present or doubt: 0
Simultaneous landing not present: 1
'Muscular control' during landing Presence of eccentric control during landing, capacity to lower the body in a controlled manner (no side movements of the knee, no sudden stops) Observe complete jump Muscular control present or not Muscular control present or doubt: 0
Muscular control not present: 1
'Genu varum' - 'Genu valgum' take-off Malalignement:
valgus or varus position
At maximal knee flexion:
perpendicular from SIAS to ankle (middle of malleoli)
- Take-off
No varum or valgum:
perpendicular goes through centre of patella
Perpendicular through patella or doubt: 0
Patella lateral from the perpendicular:
(1 = varum)
Patella medial from the perpendicular:
(2 = valgum)
'Genu varum' - 'Genu valgum' landing Malalignement:
valgus or varus position
At maximal knee flexion:
perpendicular from SIAS to ankle (middle of malleoli)
- Landing
No varum or valgum:
perpendicular goes through centre of patella
Perpendicular through patella or doubt: 0
Patella lateral from the perpendicular:
(1 = varum)
Patella medial from the perpendicular:
(2 = valgum)
'Position of feet' Feet at shoulder width. At maximal knee flexion:
Perpendicular trough centre of shoulders.
Perpendicular goes trough centre of malleolus internus and externus Perpendicular through centre of malleoli or doubt: 0
Perpendicular not through centre of malleoli: 1
'Distance between knees' compared between initial contact and maximal knee flexion Distance between knees at maximal knee flexion, 80-110% of distance between knees at initial contact. Distance between knees at first foot contact and distance between knees at maximal knee flexion. Range of 80%-110% difference. Between 80%-11%: 0
Not between 80%-110%: 1
Hyperpronation - Hypersupination feet
Take-off
Inside or outside movement of the malleoli compared to starting position. Observe complete jump
- Takeoff
Compare position feet with starting position. Hyperpronation or -supination not present or doubt: 0
Hyperpronation or supination present: 1
Hyperpronation - Hypersupination feet
landing
Inside or outside movement of the malleoli compared to starting position. Observe complete jump
- Landing
Compare position feet with starting position. Hyperpronation or -supination not present or doubt: 0
Hyperpronation or supination present: 1
Side view
(right and left)
Criteria Description Observation Measurement Score
Knee angle
- First foot contact
- Maximal knee flexion
  Knee angle at first foot contact
Knee angle at maximal knee flexion
Ankle between trochanter major - caput fibulae (tractus iliotibialis) -
mallolus externus
Degrees:
Hip angle
- First foot contact
- Maximal knee flexion
  Knee angle at first foot contact
Knee angle at maximal knee flexion
Angle between trunk - trochanter major - caput fibulae (tractus iliotibialis) Degrees:
Ankle angle
- First foot contact
- Maximal knee flexion
  Knee angle at first foot contact
Knee angle at maximal knee flexion
Angle between caput fibulae (tractus iliotibialis) - malleolus externus - parallel with sole of foot Degrees:
'shoulders above knees'   Position at maximal knee flexion Perpendicular through centre of shoulder (humerus head) Perpendicular through caput fibula: 0
Perpendicular not through caput fibula: 1
'knees not further than toes'   Position at maximal knee flexion Perpendicular through centre of knees Perpendicular not further than toes: 0
Perpendicular further than toes: 1
'forefoot landing and rolling to heel' Forefoot landing and rolling to heel Observe complete jump Pattern present or not Pattern present or doubt: 0
Pattern not present: 1
Arm swing Obvious arm swing that contributes to the jump height Observe complete jump Arm swing present or not Arm swing present: 0
Arm swing not present: 1