Which test specifically evaluates posterior chain activation sequencing?

Which test specifically evaluates posterior chain activation sequencing?

• A. Prone straight leg raise test.
• B. Trendelenburg sign.
• C. 90 90 straight leg raise test.
• D. Step down test.

Answer: (A)

Posterior chain activation sequencing is about the order in which the muscles at the back of the body turn on during hip extension. In the prone straight leg raise, you place the person face down and lift the leg with the knee straight. This setup emphasizes the posterior chain and lets you observe the timing of muscle firing as the movement begins. The trunk stabilizers (the spinal erectors) typically engage first to keep the spine steady, followed by the hip extensors (gluteus maximus and hamstrings) as the hip is extended. This sequencing reveals whether the posterior muscles coordinate properly or if compensations occur, such as premature lumbar extension or delayed gluteal activation. Other tests assess different aspects: the Trendelenburg sign mainly detects weakness of the gluteus medius during single-leg stance; the 90–90 straight leg raise tests hamstring length and neural tension; the step-down test examines dynamic control and alignment but not the specific activation order of the posterior chain.

Posterior chain activation sequencing is about the order in which the muscles at the back of the body turn on during hip extension. In the prone straight leg raise, you place the person face down and lift the leg with the knee straight. This setup emphasizes the posterior chain and lets you observe the timing of muscle firing as the movement begins. The trunk stabilizers (the spinal erectors) typically engage first to keep the spine steady, followed by the hip extensors (gluteus maximus and hamstrings) as the hip is extended. This sequencing reveals whether the posterior muscles coordinate properly or if compensations occur, such as premature lumbar extension or delayed gluteal activation.

Other tests assess different aspects: the Trendelenburg sign mainly detects weakness of the gluteus medius during single-leg stance; the 90–90 straight leg raise tests hamstring length and neural tension; the step-down test examines dynamic control and alignment but not the specific activation order of the posterior chain.