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Posture and Balance.

Components of Balance/Postural Control

The three sensory systems that are mainly involved in balance or postural control are the somatosensory (proprioception), the visual, and the vestibular systems. In any given situation, the CNS is responsible for prioritizing the information from one system to another in order to maintain balance in different conditions.

The ability to choose and relay the appropriate sensory input for each condition is sometimes referred to as sensory re-weighting. For example, when a person is standing on an unstable surface, the CNS increases sensory weighting to vestibular and visual information and decreases the dependence on surface somatosensory inputs. Likewise, when a person is in the dark, balance control depends primarily on somatosensory and vestibular feedback (de Oliveira, de Medeiros, Frota, Greteers, Conforto, 2008).

The visual system is important for determining orientation and alignment relative to objects and features of the environment. When light strikes the sensory receptors in the retina, it sends impulses to the brain that provide the visual cues necessary to oriented oneself to the surrounding environment.

The somatosensory system combines the sensory inputs of touch and proprioception to provide a sense of body schema and an awareness of the relationship between one’s body and the outside world. Information from the sensory receptors found in skin, muscles and joints, such as the mechanoreceptors (e.g. Pacinian and Meissner corpuscles, Merkle disks, Ruffini endings) and the proprioceptors (e.g. muscle spindle and Golgi tendon organ) help detect the position of body parts in space, and information about joint movement and position.

The vestibular system is part of the inner ear and is responsible for monitoring head position. It also contributes to a sense of equilibrium, which combines balance and orientation in space. Information received from eye movement, as well as head movement, are coordinated through the vestibular system. The vestibular apparatus in the inner ear, sometimes known as the labyrinth is comprised of the cochlea, semicircular canals, utricle and saccule. They function to detect the position and movement of the head and aid in maintaining equilibrium in different contexts.

https://openpub.libraries.rutgers.edu/developmentacrossthelifespan/chapter/posture-and-balance/

“Like the roots of a tree anchoring it to the earth, the muscles surrounding the lower back and hips create the deep support needed to stand tall and move with ease.”

In this class, we explore the foundational muscles of the lower back and hips—your internal stabilizers—so you can restore balance, alignment, and strength from the inside out. 

A helpful image is to imagine the root system as it stabilizes the tree during strong winds.

The body's core muscles we will be focusing on serve a similar purpose.

The quadratus lumborum (QL) is a deep muscle located in the lower back on either side of the lumbar spine. It plays a key role in stabilizing the spine and pelvis and contributes to movement and flexibility in the lumbar region. Often referred to as part of the posterior abdominal wall, the QL is integral to maintaining posture and assisting in lateral flexion of the spine.

Excessive tension in the QL can cause a condition known as 'Quadratus Lumborum Syndrome', resulting in localized lower back pain that may radiate into the pelvis, sacrum, and even the lateral thigh. Overuse, poor posture, prolonged sitting, or heavy lifting can strain the QL, leading to pain and stiffness.
Indications of Quadratus Lumborum Muscle Tension:

• Lower Back Pain (One or Both Sides).
• Hip Pain and Tightness.
• Pain During Breathing.
     - Since the QL assists with rib stabilization and can influence breathing, excessive tension in this muscle can make deep breathing uncomfortable or painful.
  
• Pelvic Imbalance or "Hiking" of One Hip.
     - A tense QL can pull the hip up on the affected side, causing an uneven pelvis, often called a "hiked" hip.
• Referred Pain Patterns.
     - Tight QL muscles can create trigger points that refer pain to other areas, often causing discomfort in the hip, buttocks, groin, or outer thigh. This pain can sometimes be mistaken for sciatica, even though it originates from the QL.

http://www.triggerpoints.net/muscle/quadratus-lumborum

The Iliocostalis Lumborum and Thoracis are part of the deep erector spinae group, which also includes the longissimus and spinalis muscles. It plays a key role in stabilizing the spine, maintaining posture, and facilitating movements of the lower back.

When the iliocostalis lumborum muscle is under stressful tension, it can lead to discomfort and functional limitations, especially in the lower back and spine. Tension in this muscle can arise from prolonged static postures (like sitting or standing), overuse, muscular imbalances, or improper biomechanics.

Corrective Massage for the iliocostalis lumborum can be beneficial for back health, posture, and movement efficiency.

Indications of imbalance:

When the Iliocostalis Thoracis muscle is under stressful tension, it can lead to discomfort, limited mobility, and postural issues in the mid-back. This tension can arise from repetitive use, poor posture, prolonged sitting, or activities that involve excessive twisting or side-bending. Here are some common signs and symptoms that may indicate the iliocostalis thoracis muscle is in a state of stressful tension:

    Mid-Back Pain and Discomfort

    Restricted Thoracic Mobility

    Stiffness After Prolonged Postures

    Postural Imbalance

   Rounded Shoulders or Hunching: Prolonged tension in the iliocostalis thoracis can contribute to a rounded shoulder or kyphotic posture, where the upper back appears hunched forward.

 http://www.triggerpoints.net/

When the Iliocostalis Thoracis muscle is under stressful tension, it can lead to discomfort, limited mobility, and postural issues in the mid-back. This tension can arise from repetitive use, poor posture, prolonged sitting, or activities that involve excessive twisting or side-bending. Here are some common signs and symptoms that may indicate the iliocostalis thoracis muscle is in a state of stressful tension:

• Mid-Back Pain and Discomfort
• Restricted Thoracic Mobility
• Stiffness After Prolonged Postures
• Postural Imbalance

   Rounded Shoulders or Hunching: Prolonged tension in the iliocostalis thoracis can contribute to a rounded shoulder or kyphotic posture, where the upper back appears hunched forward.

• Difficulty with Deep Breathing
• Fatigue and Muscle Weakness
• Radiating Pain or Sensitivity
• Pain with Specific Movements

The psoas major muscle is a long, thick muscle that originates in the lower spine and travels down to join with the iliacus muscle before inserting on the femur. Its function is crucial in hip flexion and maintaining lumbar spine stability.

 Anatomy of the Psoas Major

Location: The psoas major is located deep within the abdomen and pelvis. It lies along the lumbar spine, extending from the lower vertebrae to the femur.

Origin: The psoas major originates from the transverse processes, bodies, and intervertebral discs of the T12 to L4 vertebrae.

Insertion: The muscle runs downward and forward, eventually joining the iliacus muscle to form the iliopsoas tendon, which inserts on the lesser trochanter of the femur.

 Physiology

Muscle Fiber Type: The psoas major consists predominantly of slow-twitch muscle fibers (Type I), which are suited for endurance and stability. It also has a mix of fast-twitch fibers, allowing it to provide powerful flexion when needed.

Function

The psoas major has several key roles:

Hip Flexion: The primary function of the psoas major is hip flexion. When the muscle contracts, it lifts the femur toward the torso, a movement essential in walking, running, and other leg movements.

Trunk Flexion: When the legs are fixed, such as when lying down, the psoas major can help flex the trunk forward, assisting in movements like sitting up from a supine position.

Lumbar Spine Stabilization: The psoas major plays a vital role in stabilizing the lumbar spine, especially during movement and postural adjustments. Its position and attachments allow it to help control the curvature and integrity of the lumbar region.

 Clinical Relevance

The psoas major is involved in various postural and mobility functions, and tightness or weakness in this muscle can lead to low back pain, hip dysfunction, or postural imbalances.

The Ilio-Sacro-Lumbar ligaments (more accurately known as the Iliolumbar ligaments and Sacroiliac ligaments) are critical connective structures in the lower back, helping to stabilize the pelvis, spine, and sacrum. They play significant roles in posture, movement, and load transfer across the pelvis and spine.

Imbalance in the iliolumbar and sacroiliac ligaments can present with a mix of localized pain, restricted mobility, referred discomfort, and compensatory muscle guarding. If these signs persist or interfere with function, it may be beneficial to address any underlying biomechanical issues and pursue therapeutic interventions like physical therapy, postural correction, and strengthening exercises tailored to the lumbopelvic region.

When the iliolumbar and sacroiliac ligaments are in a state of excessive tension or stress, they often exhibit symptoms and signs due to strain, inflammation, or compensatory changes in surrounding structures.

 The Multifidi.

The multifidus muscles (plural: multifidi) are part of the deep spinal stabilizers and are essential for maintaining stability and control of the vertebral column. These muscles, located along the spine, are small but crucial for fine-tuning posture and spinal alignment, providing stability through segmental control of the vertebrae.

Function of the Multifidi

The multifidi play key roles in spinal stability, control, and balanced posture. Here’s a breakdown of their functions:

Segmental Stability

Spinal Control: The multifidi stabilize individual vertebral segments, preventing excessive motion and protecting the spine from shearing or rotational forces.

Preventing Vertebral Slippage: By controlling movement at each spinal level, the multifidi help prevent misalignment and vertebral slippage, supporting spinal health and alignment.

Postural Support

Endurance-Based Activation: The high proportion of slow-twitch fibers allows the multifidi to sustain low-level contraction over extended periods, helping to maintain upright posture, especially during prolonged sitting or standing.

Fine-Tuning Movements: The multifidi play a critical role in small adjustments needed to maintain balance and correct posture, such as counteracting slight forward or backward sways.

 Clinical Relevance

The multifidi are particularly vulnerable to dysfunction or atrophy, especially in people with low back pain or sedentary lifestyles.

Summary

The multifidi are essential, deep spinal stabilizers that maintain segmental alignment, posture, and control. Through their fine-tuned, endurance-based contraction, they play a fundamental role in supporting the spine during all forms of movement, helping to prevent injury and manage load distribution across the vertebral column. Rehabilitation and strengthening of the multifidi are often prioritized in managing and preventing low back pain.

Yes, this illustrates the origin for the Vastus Intermedius. This is where we include the fascial component for reducing regional tensions. The primary focus is adhesion techniques. 

The Gluteal muscles.

The gluteal muscles include three muscles: the gluteus maximus, gluteus medius, and gluteus minimus. Together, they play essential roles in stabilizing the pelvis, supporting posture, and enabling movements of the hip and thigh, such as walking, running, and climbing. Here’s a breakdown of their anatomy, physiology, and function:

Function: 

- Primary Functions: Abduction and internal rotation of the hip, assisting in pelvic stability.

- Activities Supported: Walking, running, single-leg stability, and hip stabilization.

 Collective Function of the Gluteal Muscles

The gluteal muscles work together to:

- Stabilize the Pelvis: Particularly during gait, preventing excessive tilt and helping balance the body on one leg as the other leg swings forward.

- Support Hip Movement: Allowing for a range of hip motions, such as extension, abduction, and rotation, critical for many daily activities and athletic movements.

- Maintain Posture and Balance: Assisting in the maintenance of an upright posture, particularly through the gluteus maximus, which prevents forward or backward tipping of the pelvis.

 Clinical Importance

Weakness or imbalance in the gluteal muscles can lead to:

- Lower back pain

- Knee pain (due to altered hip mechanics affecting knee alignment)

- Poor athletic performance

Structure of Ilio-Sacral Cartilage in the Sacroiliac Joint

1. Cartilage Composition:

   - Hyaline Cartilage: Covers the surface of the sacrum within the SI joint. Hyaline cartilage is smooth and facilitates low-friction articulation, allowing slight but essential movements between the sacrum and ilium.

   - Fibrocartilage: Covers the iliac surface of the joint. Fibrocartilage is a dense, tough form of cartilage that provides strength and resists compression, making it particularly suited for the load-bearing demands of the SI joint.

2. Dual-Layer Arrangement:

   - The combination of hyaline and fibrocartilage creates a unique, dual-layer structure that supports stability while allowing minimal, controlled movement. This layered structure allows the SI joint to function efficiently under heavy loads, such as during standing, walking, or lifting.

3. Joint Capsule and Synovial Fluid:

   - The SI joint has a joint capsule filled with synovial fluid. This fluid lubricates the cartilage surfaces, reducing wear and helping the cartilage withstand long-term pressure and stress.

Function of Ilio-Sacral Cartilage

1. Shock Absorption:

   - The cartilage within the SI joint acts as a shock absorber, distributing forces from the upper body to the pelvis and legs. Fibrocartilage on the iliac side, especially, is critical in absorbing the compressive forces encountered during daily activities, such as standing or running.

2. Stability and Force Transfer:

   - The cartilage within the SI joint, with its dual-layered structure, helps provide stability to the pelvis. It resists excessive motion, which is important because the SI joint is more about stability than mobility. This stability aids in the transfer of forces between the upper body and lower limbs, protecting both the spine and pelvis from overload.

The Rectus Abdominis can enter a state of stressful tension due to factors like poor posture, repetitive strain, or prolonged periods of stress or anxiety. Recognizing the signs of this muscle being tense or overactive can help prevent further discomfort and guide appropriate treatment.

Indicators of stressful tension:

• Lower Back Pain
• Abdominal Pain and Tenderness
• Postural Imbalance and Rounded Shoulders
• Difficulty in Breathing Deeply
• Decreased Flexibility in the Torso
• Difficulty Performing Core Exercises
• Muscle Spasms or Cramping in the Abdominal Area
• Digestive Discomfort

The rectus abdominis is located near several digestive organs. Excessive tension in this muscle can increase abdominal pressure, potentially affecting digestion and causing symptoms like bloating or discomfort, especially after meals.

The Biceps Femoris is a key muscle in the back of the thigh that contributes to knee flexion and hip extension. Its two heads have distinct roles and attachments but work together for lower body movement, especially in activities like running, walking, and jumping.

? Indications of unhealthy tension and imbalance:

Link Between Biceps Femoris Tension and Pelvic/Lumbar Issues

1. Posterior Pelvic Tilt & Lumbar Flexion

• The biceps femoris originates on the ischial tuberosity (sit bone), so when it's tight, it can pull the pelvis into a posterior tilt.
• This reduces lumbar lordosis (natural spinal curve), which can contribute to:
  • Low back discomfort
  • Increased strain on lumbar discs
  • Limited hip flexion in movements like forward bending

2. Asymmetry and Pelvic Rotation

• If tension is unilateral (one side tighter), it may contribute to:
  • Pelvic torsion or rotation
  • Functional leg length discrepancies
  • Compensatory patterns in the QL, piriformis, or SI joint region

3. Influence on Lumbar Stability

• The hamstrings (including biceps femoris) work with the glutes and core to stabilize the pelvis.
• When biceps femoris is overactive and glute max is underactive, there’s a dysfunctional load-sharing pattern that can cause:
  • Overuse of lumbar extensors
  • Reduced hip extension power
  • Increased strain during gait or lifting

4. Referred Discomfort and Fascial Connections

• Fascially, the biceps femoris connects through the posterior chain, influencing:
  • The thoracolumbar fascia
  • Tension along the erector spinae
  • Functional issues extending up the spine to the lower thoracic area

? Clinical Insight for Manual Therapists:

When you observe low back tightness or pelvic instability, always assess hamstring tone — especially the biceps femoris if there's lateral dominance. Soft tissue release, neuromuscular reeducation, and addressing glute activation can restore balance across the pelvic-lumbar complex.

Indications of Core musculoskeletal imbalance.

• Relief is short-lived:  Pain diminishes by the end of a session, only to resurface soon after.

• Chronic Pain: Persistent discomfort in areas such as the lower back, neck, shoulders, or hips can indicate imbalances or compensations within the musculoskeletal system.

• Postural Misalignment: Visible imbalances such as rounded shoulders, a forward head position, uneven hips, leg length differential, or an exaggerated curvature of the spine (lordosis, kyphosis, or scoliosis).

• Restricted Range of Motion: Difficulty moving joints freely or stiffness in areas like the shoulders, hips, or spine.

• Uneven Muscle Tone: Overdeveloped or underdeveloped muscles on one side of the body, often due to compensatory patterns or poor biomechanics.

• Frequent Injuries: Recurring injuries such as sprains, strains, or overuse injuries, which can result from improper load distribution via ‘Core’ imbalance.

• Fatigue or Weakness: A general sense of muscular fatigue or instability during daily activities or exercise, indicating poor core or foundational strength.

• Balance Issues: Difficulty maintaining balance or coordination during static positions (like standing) or dynamic movements.

• Breathing Patterns: Shallow, chest-dominant breathing instead of diaphragmatic breathing, often linked to tension in the core muscles.

• Gait Abnormalities: Changes in walking patterns, such as limping, uneven stride length, or excessive pronation/supination of the feet.

• Joint Pain or Clicking: Pain, stiffness, or audible clicking in joints like the knees, hips, or shoulders, indicating misalignment or strain.

• Headaches: Tension headaches caused by muscle tightness in the neck, shoulders, or jaw.

• Digestive or Pelvic Dysfunction: Issues such as constipation, bloating, or pelvic floor dysfunction, which can be influenced by improper core muscular engagement and alignment.

Addressing these signs through targeted bodywork can restore balance, improve function, and enhance overall well-being.

Taum's approach to manual therapy is primarily influenced by the work of Lauren Berry Sr, Registered Physical Therapist and Structural Engineer.

 Structural engineering is a sub-discipline of civil engineering. Structural engineers design the 'bones and muscles' that create the form, shape, and function of structures.

They also work with and understand the plumbing systems within those structures.

One of Lauren's many unique gifts to the manual therapy world was the concept of soft-tissue balance and distortion.

This is so appropriate:-)

Click here for more information on Lauren.