Blue Portance · Living reference
Clear definitions and independent references to understand the terms used in our articles.
94 published terms
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The definitions
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Posterior pelvic tilt refers to a backward tilting of the pelvis, which tends to reduce the lumbar curve. It may correspond to a person’s natural pelvic orientation or to a movement adopted depending on the position.
5 references cited Scope and limits in the entry
In the SBNFA™ framework, postural adaptability refers to a person's functional capacity to continuously adjust their body organization (maintaining it, modifying it, redistributing their points of support) according to the task, the environment, the available support and their functional state at the moment.
3 references cited Scope and limits in the entry
Postural balance is the ability to keep or restore the projection of the center of mass within the base of support, both at rest and in motion. When sitting, it involves the trunk, the pelvis and the hips.
3 references cited Scope and limits in the entry
A postural compensation is an adjustment by which a region of the body changes its position or its activity to maintain a function (balance, horizontal gaze, performing a task) in the face of a load, a limitation or an imbalance.
1 references cited Scope and limits in the entry
Postural control is the function by which the nervous system controls the body’s position in space, with two objectives: orientation of body segments relative to one another and to the environment, and balance.
2 references cited Scope and limits in the entry
Postural variability refers to fluctuations in posture over time. It is measured in particular through displacements of the center of pressure and is neither good nor bad in itself.
2 references cited Scope and limits in the entry
In the SBNFA™ framework, prolonged sitting intolerance refers to a reduction in how long a person can stay seated before discomfort, pain, numbness, fatigue or a need to change position appears or worsens.
1 references cited Scope and limits in the entry
Proprioception is the body’s ability to perceive the position, movement and effort of its various parts without needing to look at them.
4 references cited Scope and limits in the entry
The pudendal nerve arises mainly from the sacral roots S2 to S4. It provides a large share of the sensory and motor innervation of the perineum and the external genitalia.
4 references cited Scope and limits in the entry
Neuropathic pain in the territory of the pudendal nerve (perineum, external genitalia, anal region), often made worse by sitting.
5 references cited Scope and limits in the entry
Nutation and counternutation are very small-amplitude movements of the sacrum relative to the iliac bones. In nutation, the sacral base tilts forward and downward; counternutation is the reverse movement.
1 references cited Scope and limits in the entry
Sacral slope is the angle between the sacral plate (the upper surface of the first sacral vertebra) and the horizontal. It increases when the pelvis tilts forward (anterior pelvic tilt) and decreases when it tilts backward (posterior pelvic tilt): it is a positional parameter.
2 references cited Scope and limits in the entry
The sacroiliac joint connects the sacrum to the iliac bone on each side of the pelvis. A true joint, very stable and with a very small range of motion, it transmits and distributes loads between the trunk and the lower limbs.
3 references cited Scope and limits in the entry
The sacrospinous ligament connects the sacrum and coccyx to the ischial spine and contributes to the mechanical organization of the posterior pelvis.
3 references cited Scope and limits in the entry
The sacrotuberous ligament is a broad ligament connecting the sacrum to the ischial tuberosity and contributing to the posterior mechanical organization of the pelvis.
4 references cited Scope and limits in the entry
Sciatica is pain that follows the path of the sciatic nerve, from the buttock down the back or side of the leg, sometimes as far as the foot. It is most often related to irritation of a lower lumbar nerve root (L5 or S1), frequently from a herniated disc.
4 references cited Scope and limits in the entry
Shear is a deformation produced by forces parallel or tangential to a surface, which cause neighboring layers or regions of a tissue to slide relative to one another.
3 references cited Scope and limits in the entry
The spinal profile refers to the shape of the spine seen from the side, that is, the organization of its curves in relation to the orientation of the pelvis. It varies naturally from one person to another.
3 references cited Scope and limits in the entry
Stress concentration refers to an uneven distribution of forces or deformations in the body: some areas are loaded more than others.
3 references cited Scope and limits in the entry
The thoracolumbar fascia is a set of connective tissue layers in the lower back. It envelops the deep back muscles and receives the attachments or extensions of several muscles of the trunk and pelvis.
4 references cited Scope and limits in the entry
In the SBNFA™ framework, tissue adaptability refers to the functional capacity of tissues, particularly fascia, to change their mechanical configuration under stress, to redistribute that stress, to recover after unloading and to evolve over time without lastingly losing their capacity for deformation and gliding.
3 references cited Scope and limits in the entry
A trigger point is a highly sensitive spot located within a taut band of muscle; pressing it can reproduce a familiar pain and sometimes pain felt at a distance (referred pain).
4 references cited Scope and limits in the entry
