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Hop testing after #ACLR – horizontal (distance) is easier to measure than vertical (height) but are they the same?
(Spoiler: not even close)
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(Spoiler: not even close)
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During a vertical hop, the hip, knee, and ankle contribute almost equally, during push-off (height achieved) and landing (force absorption).
Horizontal hop is very different.
Work during propulsion (=distance achieved): knee contributes only 13% but the landing phase (absorption) is done 2/3 by the knee.
Work during propulsion (=distance achieved): knee contributes only 13% but the landing phase (absorption) is done 2/3 by the knee.
Vertical hop is a better metric to evaluate knee function than horizontal.
Achieving equal hop distance can hide deficits in knee function since distance is mostly achieved from the hip & ankle
Achieving equal hop distance can hide deficits in knee function since distance is mostly achieved from the hip & ankle
