PELVIFEMORAL RHYTHM(OPEN /CLOSE CHAIN) (HIP JOINT COMPLEX BIOMECHANICS)Physiotherapy Tutorials

Summary

In this video, Adeb from Movement Science explores biomechanics concepts such as open and closed kinematic chains and pelvic-femoral rhythm. The video explains how open and closed chain movements differ in the body, particularly with the pelvis, trunk, and legs. Adeb further discusses how compensations can occur in the body, leading to back pain and other issues. The pelvic-femoral rhythm is compared to scapular-humeral rhythm, showing how both increase range of motion. Real-life examples illustrate how pelvis and lumbar spine movements assist in maximizing hip motion, offering a practical understanding of these important concepts.

Takeaways

• 😀 The channel 'Movement Science' focuses on simplifying biomechanics and related topics.
• 📚 Viewers are encouraged to subscribe and follow on Instagram for daily multiple-choice questions (MCQs) to brush up on biomechanics.
• 🔄 The video explains the concepts of open chain and closed chain kinematics in the context of the hip joint.
• 🔗 Open chain kinematics involve one end of a chain being fixed while the other end is free to move, like when the trunk moves with fixed legs.
• 🔒 Closed chain kinematics involve both ends of the chain being fixed, leading to compensatory movements in the body when one part moves.
• 🦵 Anterior pelvic tilt in open chain kinematics results in the trunk bending forward, whereas in closed chain kinematics, the trunk and head remain fixed with compensation at the lumbar spine.
• ⚖️ Functional closed chain involves the body maintaining the head's position through visual and primitive reflexes, even when structural fixation is not possible.
• 💡 Clinical scenarios demonstrate how tight muscles or leg length discrepancies can lead to compensatory movements and potential pain due to closed chain kinematics.
• 🏋️‍♂️ The pelvic femoral rhythm is similar to the scapular humeral rhythm and involves increased range of motion through coordinated movement of the pelvis, lumbar spine, and hip.
• 🎯 Understanding the interaction of these kinematic chains and rhythms helps in diagnosing and managing conditions that affect movement and posture.

Q & A

What is the concept of open and closed kinematic chains in biomechanics?

An open kinematic chain refers to a movement where one end of the chain is fixed, and the other end is free to move. A closed kinematic chain, on the other hand, involves both ends of the chain being fixed, with movement occurring in the middle portion of the chain.

How does open chain kinematics work in the body?

In open chain kinematics, one end of the body, such as the legs, is fixed, while the other end, like the trunk, is free to move. For example, during an anterior pelvic tilt, the trunk and head move while the legs remain fixed on the ground.

What makes closed chain kinematics more complex in the hip compared to other joints like the knee?

The complexity arises because the hip joint is centrally placed in the body, making it more challenging to visualize and understand how movement occurs when both ends of the chain (such as the legs and trunk) are fixed.

What is the role of functional closed chain kinematics in maintaining posture?

In functional closed chain kinematics, the body maintains posture by fixing the head in relation to the sacrum using reflexes like optical writing and the tonic labyrinth reflex. These reflexes help the body keep the head aligned even if the body is in motion or undergoing changes.

What compensations occur in a closed kinematic chain when there is anterior pelvic tilt?

When there is an anterior pelvic tilt in a closed chain, the lumbar spine compensates by undergoing extension or lumbar lordosis to maintain the position of the trunk and head. This compensation can lead to low back pain if the individual has tight muscles like the rectus femoris.

How does leg length discrepancy affect the pelvis and spine in a functional closed kinematic chain?

In cases of leg length discrepancy, the pelvis tilts and drops on the shorter leg. In a functional closed kinematic chain, the trunk and head correct the posture, but the lumbar spine may laterally flex to maintain balance, potentially causing low back pain or facet joint issues on the opposite side.

What is pelvic femoral rhythm and how does it compare to scapular humeral rhythm?

Pelvic femoral rhythm describes the coordinated movement of the pelvis, femur, and lumbar spine during hip movements. It is similar to scapular humeral rhythm, where the scapula moves with the humerus to increase the range of motion. Both rhythms help increase mobility by involving multiple body parts in the same movement.

How does pelvic femoral rhythm enhance hip flexion?

In hip flexion, when the hip joint reaches its limited range of motion, the pelvis undergoes an anterior tilt, and the lumbar spine flexes to increase the overall range. This combined movement at the pelvis, lumbar spine, and hip joint allows for a greater range of motion than the hip alone.

What happens during hip abduction in relation to pelvic femoral rhythm?

During hip abduction, the pelvis may hike to increase the range of motion. Additionally, the lumbar spine may laterally flex to further enhance the range of abduction, demonstrating the coordinated movement between the pelvis, lumbar spine, and hip joint.

Why does a tight rectus femoris lead to compensation in the lumbar spine?

A tight rectus femoris causes the pelvis to tilt anteriorly, but the body compensates by increasing lumbar lordosis. This compensation helps to maintain the trunk and head in the correct position, but it can lead to low back pain over time due to the increased strain on the lumbar spine.