Trendelenburg and compensated Trendelenburg [Fix your Pelvis Drop!]

Описание: Shown here are 2 movement strategies, both of which are most commonly caused by weakness and/or poor motor control of the hip abductors (particularly the gluteal muscles):
1. The first strategy (Trendelenburg) shown here is manifests as a pelvic drop, in which the pelvis of the limb that is in swing phase will DROP. This is because the recruitment of the hip abductors of the stance limb is less than optimal to maintain the pelvis level.
2. The second strategy (Compensated Trendelenburg) shown manifests as a trunk lean towards the stance limb. This movement strategy brings my center of mass over my base of support (the stance foot). This is a compensatory strategy to decrease the external moment that gravity will put on my hip abductors!
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In a normal gait pattern, the trunk and pelvis are stable meaning there will be less than 5 degrees of movement in the frontal plane (from side to side).
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Both of these strategies are compensatory movement patterns that may lead to back pain over time. This Series will look at ways in which you can reduce this poor movement strategy!
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Quick History Lesson: In 1895 Freidrich Trendelenburg described the Trendelenburg sign as weakness of hip abductor muscles in reference to congenital dislocations of the hip and progressive muscular atrophy. Fast forward to today: most orthopedic and physiotherapy textbooks describe this sign as a test of hip function.
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Apley’s system of orthopaedics wrote: “Normally each leg bears half the body weight. When one leg is lifted the other takes the entire weight. As a result the trunk has to incline towards the weight-bearing leg. This is achieved by the hip abductors; their insertion is fixed and the pull is exerted on their origin. Consequently the pelvis tilts, rising on the side not taking weight. When this mechanism fails, Trendelenburg’s sign is positive. The pelvis drops instead of rising on the unsupported side.”
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Note: the individual here does not actually have his sign and is acting it out (rather poorly lol)
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