The Lumbopelvic-Hip Complex and Its Role in Low Back Pain: A Chiropractic Perspective

The lumbopelvic-hip complex (LPHC) is an integrated functional unit where the lumbar spine, pelvis, and hip joints operate synergistically to transfer loads and facilitate movement, with its stability conceptualized through models such as Manohar Panjabi's 1992 three-subsystem framework of passive, active, and neural control elements ¹. The biomechanical integrity of this complex is fundamental to nearly all human activities, from simple standing to complex athletic maneuvers. A core principle of LPHC function is the lumbopelvic rhythm, a coordinated motion between the lumbar spine and pelvis first qualitatively described by Rene Cailliet in 1968 as a smooth sequence during forward bending ². During sagittal plane trunk flexion in asymptomatic individuals, the lumbar spine contributes more to the trunk rotation during the early stage of the movement, while the pelvis contributes more during the final stage. ³. The reliability of measuring these kinematic relationships with tools like dual inclinometers has been shown to be good, allowing for objective clinical assessment ⁴.

Dysfunction within the LPHC is a central factor in the etiology and perpetuation of non-specific low back pain (LBP). Altered neuromuscular control is a key pathological finding. A landmark 1996 study in Spine by Hodges and Richardson demonstrated that the anticipatory, feed-forward activation of the transversus abdominis muscle was significantly delayed in subjects with LBP compared to healthy controls during rapid limb movements ⁵. Concurrently, research has identified significant morphological changes in the stabilizing musculature; a 1994 study by Hides et al. found marked, ipsilateral wasting of the lumbar multifidus muscle in patients with acute LBP ⁶. These muscular deficits compromise the "force closure" mechanism of the sacroiliac joints, a system of stabilization provided by the coordinated action of the transversus abdominis, gluteal muscles, and thoracolumbar fascia ⁷.

These neuromuscular deficits manifest as aberrant movement patterns that distinguish individuals with LBP. A 1996 study by Esola et al. found that while the total range of motion in forward bending was similar, the pattern of motion, specifically the lumbar-to-hip flexion ratio, differed between subjects with and without a history of LBP ⁸. Other compensatory strategies include the adoption of greater posterior pelvic tilt and a more flexed lumbar spine during sitting in individuals with chronic LBP ⁹. The concept of a "hip-spine syndrome," as classified by Offierski and MacNab in 1983, formalizes the clinical observation that primary hip pathology can directly cause or aggravate spinal symptoms ¹⁰. A 2020 study by Kim and Shin published in the Journal of Back and Musculoskeletal Rehabilitation found a strong correlation between limited hip extension and compensatory lumbar rotation in patients with nonspecific chronic low back pain, suggesting this compensation could lead to excessive mechanical stress in the lumbar region. ¹¹. A 2015 study of 388 patients over age 50 who were undergoing spinal surgery found that 32.5% had significant co-existing hip pathology upon radiographic review. ¹².

Within the chiropractic profession, the assessment and management of LBP are founded on this integrated model. Evaluation routinely extends beyond the site of pain to include a functional analysis of the entire LPHC, employing procedures like the Trendelenburg test to assess hip abductor stability ¹³ and classifying patients based on lumbopelvic movement patterns observed during functional tests ¹⁴.¹⁵ As outlined in standard texts such as Bergmann and Peterson's Chiropractic Technique, management protocols incorporate manipulative procedures for the spine, pelvis, and hip, complemented by rehabilitative strategies. This approach aims to restore both segmental joint mobility and global neuromuscular control, a principle supported by evidence that specific stabilization exercises can reverse multifidus muscle atrophy and correspond with a reduction in LBP ¹⁶.

Historical development of the lumbopelvic concept in chiropractic

The early philosophical and clinical framework of chiropractic, established by Daniel David Palmer in the late 19th century, was predominantly focused on the detection and correction of the vertebral subluxation as the primary cause of disease ¹⁷. This foundational model, detailed in historical accounts and Palmer's own writings, centered on the relationship between a single misaligned vertebra and its effect on the nervous system ¹⁸. While the vertebral column remained the profession's central concern, particularly in the upper cervical-specific work promoted by B.J. Palmer, other practitioners and technique innovators began to place significant clinical emphasis on the pelvis and sacroiliac joints. This represented an early, internal expansion of the subluxation concept beyond the individual spinal segments.

A significant evolution in thought occurred during the mid-20th century with the gradual integration of biomechanical principles. The concept of 'lumbopelvic rhythm' was a critical component of this shift. While understood clinically by many, it was formally described by physiatrist Rene Cailliet in his influential 1968 book, Low Back Pain Syndrome. Cailliet characterized lumbopelvic rhythm as the coordinated, smooth sequence of lumbar flexion and concurrent pelvic rotation on the femoral heads during forward bending ². The introduction of this concept into the broader musculoskeletal discourse encouraged a move away from a purely static, segmental model of spinal pathology toward a more dynamic, functional understanding. It highlighted that the lumbar spine, pelvis, and hips did not function in isolation but as an integrated mechanical unit.

This functional perspective was progressively absorbed into chiropractic education and clinical practice, expanding the diagnostic paradigm beyond static palpation and radiographic line analysis. The inclusion of functional assessments became more common in chiropractic college curricula, reflecting a professional evolution documented in histories of chiropractic education ¹⁹. Modern chiropractic technique manuals, such as Bergmann and Peterson’s Chiropractic Technique, codify this integrated approach. These texts detail examination and management strategies for the entire lumbopelvic-hip complex, representing a significant development from the singular focus on the vertebral segment that characterized the profession's inception. This historical transition from a "bone-out-of-place" model to a sophisticated appreciation of lumbopelvic biomechanics laid the groundwork for contemporary evidence-based approaches to low back pain.

Anatomy and biomechanical principles of stabilization

The lumbopelvic-hip complex is an integrated system of bones, joints, ligaments, and muscles that connects the spine to the lower limbs. Its stability is essential for load transfer, posture, and movement. A foundational theoretical framework for understanding this stability was proposed by Manohar Panjabi in a 1992 paper in the Journal of Spinal Disorders [2]. This model posits that spinal stability relies on the coordinated interplay of three distinct but interdependent subsystems: the passive, active, and neural control systems [2].

The passive subsystem consists of the non-contractile osteoarticular and ligamentous structures, including the lumbar vertebrae, intervertebral discs, facet joints, and associated ligaments like the iliolumbar and sacroiliac ligaments. These structures provide inherent stability, particularly at the end ranges of motion, and contribute to the intrinsic mechanical properties of the spine. The active subsystem comprises the muscles and tendons that cross the lumbar spine, pelvis, and hips. Its function is to generate the forces required for dynamic joint stabilization, a concept described as 'force closure' [7]. A 2012 review in the Journal of Anatomy by Vleeming et al. identified a key force closure mechanism for the sacroiliac joint involving an integrated system of muscles, including the transversus abdominis (TrA), gluteal muscles, and the thoracolumbar fascia [7]. Research has shown significant dysfunction in this subsystem in patients with low back pain (LBP). For instance, a 1994 study in Spine by Hides et al. found marked wasting of the lumbar multifidus muscle, with an average asymmetry of 31% ± 8% in cross-sectional area at the symptomatic level in patients with acute LBP [6]. Similarly, the gluteus medius and minimus muscles are critical for pelvic stability in the frontal plane, with weakness being clinically assessed by the Trendelenburg test, first described in 1895 [9].

The neural control subsystem is the central processing unit that receives sensory information from the passive and active structures and coordinates a timely and appropriate muscular response. Deficits in this subsystem are a hallmark of LBP. A landmark 1996 study in Spine by Hodges and Richardson demonstrated that the feed-forward activation of the TrA, a preparatory contraction that stabilizes the spine before limb movement, was significantly delayed in subjects with LBP compared to healthy controls [3]. This neural control failure can disrupt normal biomechanics, such as the lumbopelvic rhythm, the coordinated sequence of lumbar flexion and pelvic rotation during forward bending first described qualitatively by Rene Cailliet in 1968 [1]. Studies have quantified this disruption; a 1996 investigation by Esola et al. found that while total bending range of motion was similar, the lumbar-to-hip flexion ratios differed significantly between subjects with and without a history of LBP [4]. This clinical reality of interconnected dysfunction led researchers like Offierski and MacNab to propose the concept of 'hip-spine syndrome' in 1983, classifying the overlapping pathologies of the two regions [5]. Further evidence shows how limited hip motion can induce compensatory stress on the lumbar spine; for example, restricted hip extension can lead to compensatory lumbar hyperextension during gait, increasing shear forces at the L4-L5 segments [11].

Lumbopelvic rhythm: normal kinematics and patterns of dysfunction

The concept of a coordinated sequence of spinal and pelvic motion during trunk flexion, known as the lumbopelvic rhythm, is a foundational element in the biomechanical assessment of the lumbar spine. Rene Cailliet, in his 1968 text Low Back Pain Syndrome, first provided a qualitative description of this rhythm as a smooth, continuous, and integrated process of lumbar spine flexion followed by anterior pelvic rotation on the femoral heads [1]. Subsequent quantitative research has refined this model. A 2017 review by Vazirian et al. confirmed that in asymptomatic individuals, the initial 50 to 60 percent of forward bending is dominated by flexion of the lumbar spine. The latter phase of the movement is then primarily driven by anterior pelvic tilt, or hip flexion [16]. This sequential pattern allows for a large range of motion while distributing mechanical stress across multiple joints. The return to an upright posture ideally reverses this sequence, initiated by posterior pelvic rotation via hip extensor muscle activation, followed by extension of the lumbar spine.

In low back pain (LBP) populations, this coordinated rhythm is frequently disrupted, a phenomenon termed lumbopelvic dyskinesia. While the total range of motion may be unchanged, the relative contribution and timing of lumbar and hip movements are altered [4]. A 2014 study in Manual Therapy by Laird et al. documented a manifestation of this altered control even in static postures; they found that individuals with non-specific chronic LBP adopted a slump sitting posture characterized by significantly greater posterior pelvic tilt and a more flexed lumbar spine compared to healthy controls [12]. Such findings suggest a default motor control strategy that de-emphasizes normal lumbar curvature. Research by McClure et al. in 2001 classified LBP patients into subgroups based on aberrant movement patterns observed during an active straight leg raise, identifying patterns such as excessive or early lumbar motion where hip motion should predominate [15]. This "gower's sign" of the lumbopelvic region, where the spine moves excessively to compensate for inhibited or weak hip musculature, is a common clinical finding.

The breakdown of normal lumbopelvic rhythm is often linked to failures in the neuromuscular control system, one of the three subsystems of spinal stability proposed by Manohar Panjabi [2]. For example, delayed feed-forward activation of the transversus abdominis muscle, as identified by Hodges and Richardson in 1996, can compromise segmental stability and force altered, gross movement strategies [3]. Similarly, ipsilateral wasting of the lumbar multifidus muscle in acute LBP patients creates an inability to control specific vertebral segments, potentially forcing compensatory motion elsewhere [6]. The assessment of these movement patterns is a key part of the chiropractic examination. The reliability of measuring lumbopelvic rhythm in a clinical setting has been established; a 2010 study by Lein-Rasmussen et al. demonstrated that using dual inclinometers to measure lumbar and pelvic contributions to motion has good intra-rater and inter-rater reliability, with Intraclass Correlation Coefficients generally above 0.80 [14]. Identifying and categorizing these dysfunctional patterns, as outlined in chiropractic technique texts, informs the selection of appropriate manual therapies and rehabilitative exercises [23].

The core musculature's role in active stabilization

The stability of the lumbopelvic region depends significantly on the active subsystem, a concept defined by Manohar Panjabi in his 1992 tripartite model of the spinal stabilizing system as the collection of muscles and tendons responsible for generating movement and stabilizing forces [2]. Within this subsystem, a group of deep local muscles, often termed the 'inner core,' provides anticipatory and segmental stabilization. Dysfunction of this musculature is a consistent finding in low back pain (LBP) research and a primary target for chiropractic rehabilitative strategies [23]. Two of the most extensively studied muscles in this group are the transversus abdominis and the lumbar multifidus.

The transversus abdominis (TrA) is the deepest of the abdominal muscles, with fibers oriented horizontally, forming a muscular corset around the abdomen. Its contraction increases intra-abdominal pressure, which acts as a hydraulic splint for the lumbar spine, and creates tension through the thoracolumbar fascia. A landmark 1996 study in Spine by Paul Hodges and Carolyn Richardson provided direct evidence of TrA dysfunction in LBP. They demonstrated that in healthy individuals, the TrA contracts in a feed-forward mechanism, activating prior to rapid arm or leg movements to pre-stabilize the trunk. In subjects with a history of LBP, this anticipatory activation was significantly delayed or inconsistent, suggesting a deficit in the neural control subsystem's ability to recruit the muscle for its stabilizing role [3].

Similarly, the deep lumbar multifidus muscles, which span one to three vertebral segments, are critical for providing stiffness and controlling motion at individual lumbar levels. Research by Julie Hides and colleagues in 1994, also published in Spine, used ultrasound imaging to investigate multifidus size in patients with first-episode acute LBP. They found rapid and marked muscle wasting, specifically a 31% (± 8%) smaller cross-sectional area on the side ipsilateral to the symptoms compared to the asymptomatic side [6]. This atrophy occurred quickly after injury and did not spontaneously recover even after symptoms resolved. A follow-up study demonstrated that a specific stabilization exercise program targeting the multifidus and TrA could restore muscle size, and this recovery was associated with a significant reduction in pain and recurrence rates over one year [8].

These muscles do not work in isolation but as part of an integrated system that provides 'force closure' to the pelvic girdle. This mechanism, described in a 2012 review by Andry Vleeming et al., refers to the generation of compressive forces across the sacroiliac joints to enhance their stability, as they have minimal inherent bony congruence [7]. The co-contraction of the TrA, internal oblique, gluteal muscles, and contralateral latissimus dorsi, all linked through the thoracolumbar fascia, creates a self-bracing effect that stabilizes the pelvis. Dysfunction in the timing or strength of these muscles, as documented in LBP populations [3, 6], can impair this force closure mechanism, leading to aberrant joint mechanics and contributing to pain originating from either the lumbar spine or the sacroiliac joints.

Hip-spine and sacroiliac syndromes: interdependent pathologies

The clinical relationship between the hip and the lumbar spine is a well-established concept, formalized as 'hip-spine syndrome' in a 1983 paper by C. M. Offierski and Ian MacNab [5]. They proposed diagnostic criteria classifying the syndrome into three types: 'simple', where symptoms have a clear origin in either the hip or the spine; 'secondary', where spinal symptoms are caused or aggravated by a hip deformity or pathology; and 'complex', where symptomatic disease exists at both sites concurrently [5]. This framework acknowledges that pain perceived in the low back or buttock region may originate from intra-articular hip pathology, a finding supported by modern imaging. A 2015 study in PM&R by Prather et al. found that among 247 patients presenting to a spine clinic with a chief complaint of low back pain, 25.5% had significant intra-articular hip pathology identified on magnetic resonance imaging [13].

Biomechanical limitations at the hip are a primary driver of compensatory stress in the lumbopelvic region, particularly when they disrupt the normal lumbopelvic rhythm described by Rene Cailliet [1]. One of the most frequently cited examples of this interdependence involves restricted hip extension. In her 2002 book, Diagnosis and Treatment of Movement Impairment Syndromes, Shirley Sahrmann proposed that a limitation in hip extension range of motion, often due to tight anterior hip capsule or hip flexor muscles, forces the body to achieve the necessary terminal extension during gait through compensatory lumbar hyperextension [11]. This repeated, end-range loading of the lumbar spine increases shear forces and compressive loads on the facet joints and posterior annulus of the intervertebral discs, particularly at the L4-L5 and L5-S1 segments [11].

Weakness of the hip musculature represents another critical link. The stability function of the hip abductor muscles, primarily the gluteus medius and minimus, has been recognized since Friedrich Trendelenburg first described his eponymous test in 1895 [9]. Weakness of these muscles on the stance-side leg results in an inability to stabilize the pelvis in the frontal plane, leading to a drop of the contralateral pelvis during gait [9]. This pelvic instability requires compensatory muscle activation patterns and can lead to increased stress on the sacroiliac joint and lumbar spine. A 2012 study by Nelson-Wong et al. in Clinical Biomechanics demonstrated this maladaptive strategy, finding that a pattern of bilateral gluteus medius co-activation was prevalent in subjects who went on to develop low back pain during a prolonged standing task [10]. This suggests that what begins as a compensatory strategy for hip muscle insufficiency can itself become a source of pain and dysfunction in the lumbar region. The integrated assessment of hip mechanics and function is therefore fundamental within chiropractic practice, as detailed in textbooks such as Chiropractic Technique by Bergmann and Peterson [23].

Chiropractic assessment and functional diagnosis

The chiropractic clinical evaluation of the lumbopelvic-hip complex (LPHC) is a structured process designed to identify specific biomechanical and neuromuscular dysfunctions contributing to a patient's low back pain. This assessment framework evaluates the integrity and interplay of the three subsystems described in Manohar Panjabi's 1992 spinal stability model: the passive (vertebrae, ligaments), active (muscles), and neural control components [2]. A primary focus is the qualitative and quantitative analysis of movement.

Movement screening begins with the observation of the lumbopelvic rhythm, a concept qualitatively described by Rene Cailliet in 1968 as the coordinated sequence of lumbar flexion and pelvic rotation during forward bending [1]. While the total range of motion may be similar between symptomatic and asymptomatic individuals, the pattern itself is often altered in patients with low back pain, showing different lumbar-to-hip flexion ratios [4]. In asymptomatic individuals, trunk flexion is typically initiated by the lumbar spine, with pelvic motion dominating the later phase [16]. Clinicians may use dual inclinometers, which have demonstrated good intra-rater and inter-rater reliability with Intraclass Correlation Coefficients generally above 0.80, to quantify the contributions of each segment [14]. Functional diagnosis also incorporates concepts from Shirley Sahrmann's work, which posits that repetitive compensatory movements, such as lumbar hyperextension during gait to compensate for limited hip extension, can generate pain by increasing shear forces at lumbar segments [11]. Similarly, static posture analysis, like the slump sitting test, can reveal maladaptive patterns; a 2014 study by Laird et al. found that individuals with chronic low back pain exhibited significantly greater posterior pelvic tilt and a more flexed lumbar spine in this position [12].

Specific orthopedic tests and palpation are used to further isolate dysfunctional structures. The Trendelenburg test, first described by Friedrich Trendelenburg in 1895, assesses the stability function of the hip abductor muscles by observing for a pelvic drop on the non-stance side, which indicates gluteus medius and minimus weakness on the stance side [9]. Palpation and real-time ultrasound imaging are used to assess the function of deep stabilizing muscles. Research by Hodges and Richardson in 1996 found that the feed-forward activation of the transversus abdominis was significantly delayed in subjects with low back pain [3]. Similarly, a 1994 study by Hides et al. identified marked wasting of the lumbar multifidus muscle, with a between-side asymmetry in cross-sectional area of 31% (± 8%) at the symptomatic vertebral level in patients with acute low back pain [6]. These muscles are key contributors to the 'force closure' mechanism of the sacroiliac joint [7].

The synthesis of these findings allows for the classification of patients into functional subgroups, guiding treatment. For example, a 2001 study by McClure et al. used the active straight leg raise to classify patients based on aberrant lumbopelvic movement patterns, such as excessive lumbar extension [15]. This diagnostic process is critical for differentiating primary spinal pathology from pain referred or caused by hip dysfunction, a condition described by Offierski and MacNab in 1983 as 'hip-spine syndrome' [5]. The clinical importance of this differentiation is significant, as a 2015 study by Prather et al. found that 25.5% of patients presenting to a clinic with a chief complaint of low back pain had identifiable intra-articular hip pathology on MRI [13].

Evidence-based therapeutic interventions

Chiropractic management of lumbopelvic-hip complex (LPHC) dysfunction employs a multi-modal strategy, with interventions selected based on the specific biomechanical and neuromuscular deficits identified during diagnosis. This approach can be framed using Manohar Panjabi's 1992 model of spinal stability, which targets the passive (articular), active (muscular), and neural control subsystems [2]. The overarching goal is to restore normal joint kinematics, improve muscle function and motor control, and reduce pain.

Spinal manipulative therapy (SMT), often termed the chiropractic adjustment, is a primary intervention directed at the passive and neural control subsystems. As detailed in texts such as Bergmann and Peterson's Chiropractic Technique, SMT involves the application of high-velocity, low-amplitude thrusts to hypomobile or dysfunctional spinal or sacroiliac joints [23]. The mechanical objective is to restore normal joint motion, thereby influencing the lumbopelvic rhythm, the coordinated sequence of lumbar and pelvic motion during flexion first described qualitatively by Rene Cailliet in 1968 [1]. By stimulating mechanoreceptors, SMT is also thought to modulate afferent input to the central nervous system, potentially altering pain perception and reflex muscle activity within the neural control subsystem [2].

Complementary soft tissue therapies address the active subsystem. These techniques may include myofascial release, instrument-assisted mobilization, or trigger point therapy aimed at muscles and fascia that contribute to LPHC stability. A key target is the integrated system of muscles, including the transversus abdominis, gluteal muscles, and thoracolumbar fascia, which provides the 'force closure' stabilization mechanism for the sacroiliac joint [7]. Interventions may focus on inhibiting overactive muscles, such as the co-contracting gluteus medius muscles found in individuals who develop pain during prolonged standing [10], or facilitating weak muscles like the hip abductors identified through a positive Trendelenburg test [9].

Specific motor control and stabilization exercises form a cornerstone of rehabilitating the active and neural control subsystems. The scientific rationale for this approach was established by foundational research, such as the 1996 study by Hodges and Richardson in Spine, which demonstrated that the feed-forward activation of the transversus abdominis muscle was significantly delayed in individuals with low back pain [3]. Consequently, exercises are prescribed to retrain the timing and activation of these deep stabilizing muscles. A critical target is the lumbar multifidus muscle. A 1994 study by J. A. Hides and colleagues in Spine first identified significant multifidus muscle wasting at the symptomatic vertebral level in patients with acute low back pain [6]. In a subsequent landmark study that same year, Hides et al. demonstrated that a specific exercise program targeting the multifidus could restore the muscle's cross-sectional area. Importantly, this recovery of muscle morphology was associated with a reduction in pain and a lower rate of recurrence at one-year follow-up, providing direct evidence for the effectiveness of specific exercises in restoring muscle structure and function [8]. Exercise prescription also extends to the hip, addressing movement impairments such as limited hip extension, which can cause compensatory lumbar hyperextension and increase spinal loading, a concept detailed in Shirley Sahrmann’s work [11].

Significance, clinical debates, and future directions

The growing body of research on the lumbopelvic-hip complex (LPHC) marks a significant evolution in the chiropractic understanding of low back pain (LBP), moving from a primarily segmental and structural model to a more integrated, functional paradigm. This shift is theoretically grounded in frameworks like Manohar Panjabi's 1992 model, which posited that spinal stability relies on the interplay of passive structures, active musculature, and neural control [2]. This model provided a scientific rationale for expanding clinical focus beyond the vertebral joint to include the muscular and neurological systems that govern LPHC function. The traditional chiropractic emphasis on joint mechanics, as seen in technique textbooks [23], has been augmented by an appreciation for dynamic stability and motor control.

A central clinical debate emerging from this shift concerns the application of motor control research. The landmark 1996 study by Hodges and Richardson, which identified delayed feed-forward activation of the transversus abdominis (TrA) in individuals with LBP [3], catalyzed a widespread focus on isolated "core" muscle training. However, the clinical efficacy and theoretical basis of isolating one muscle have been questioned. An alternative, more integrated perspective is offered by the "force closure" model of sacroiliac joint stability, which emphasizes a coordinated system of muscles, including the TrA, gluteal muscles, and thoracolumbar fascia, working in concert [7]. This integrated view is supported by findings that demonstrate complex alterations in muscle function beyond simple weakness or delay. For instance, a 2012 study found that co-activation of the bilateral gluteus medius muscles, rather than just weakness on one side, was common in individuals who developed LBP during prolonged standing [10]. This suggests that motor control deficits in LBP may involve inefficient co-contraction strategies, not just isolated muscle failure.

Furthermore, a purely biomechanical approach has limitations. While studies have successfully identified differences in movement patterns, such as altered lumbar-to-hip flexion ratios [4] or increased posterior pelvic tilt during sitting [12] in LBP populations, these findings do not definitively establish causality or dictate a universal corrective strategy. Focusing exclusively on correcting observed movement "faults" risks overlooking underlying structural pathology. For example, research has found that a significant percentage of patients presenting with a primary complaint of LBP have concurrent intra-articular hip pathology, a finding that supports the clinical relevance of the "hip-spine syndrome" first described in 1983 [13, 5]. This underscores the necessity of a comprehensive diagnostic approach that considers the hip joint as a primary pain generator.

Future research must aim to bridge the gap between laboratory findings and clinical practice. A promising avenue is the development of classification systems to subgroup patients based on their specific LPHC movement impairments, as proposed by McClure et al. in 2001, which could lead to more targeted and effective interventions [15]. Progress in this area depends on the use of reliable clinical measurement tools, such as the dual inclinometers shown to have good reliability for assessing lumbopelvic rhythm [14]. Ultimately, future investigations should seek to clarify which interventions best restore functional motor control, moving beyond simply identifying deficits like multifidus atrophy [6] toward validating rehabilitation strategies that improve long-term patient outcomes.

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