INTRODUCTION
Interventional pain management has become increasingly prominent in the treatment of spinal disorders, particularly in cases where conventional therapies fail to yield adequate symptom relief. Improvements in anatomical knowledge, image-guided techniques, and minimally invasive methods have enabled more precise and targeted approaches to the diagnosis and management of spinal pain [1]. Nevertheless, spinal pain is inherently multifactorial and complex, often requiring accurate localization of the pain source to guide effective treatment.
Neck pain is frequently encountered in clinical practice and affects a large proportion of the population over a lifetime. In most cases, the pain spontaneously improves or responds to conservative measures such as pharmacologic therapy, physical rehabilitation, or lifestyle modification. However, a subset of patients develops persistent or recurrent symptoms that may progress into chronic conditions. In these individuals, timely evaluation and appropriate therapeutic intervention are crucial for improving daily function and quality of life. Cervical spine pain can originate from diverse anatomical structures, including muscles, ligaments, intervertebral discs, and joints. Among these potential sources, cervical facet joints (CFJs) have been recognized as a key contributor, particularly in individuals presenting with non-radicular, axial neck pain [2]. Pain associated with these joints is thought to result from a combination of trauma, degenerative changes, repetitive mechanical loading, and segmental instability, all of which may sensitize local nociceptive pathways. Although the involvement of these mechanisms is increasingly acknowledged, clinical differentiation of facet joint-mediated pain from other cervical pain syndromes remains a diagnostic challenge.
In response to these uncertainties, various interventional treatment strategies have been proposed and implemented. While treatment options for neck pain span pharmacologic, rehabilitative, and surgical domains, this review specifically addresses interventional approaches. These encompass minimally invasive procedures used for both diagnostic clarification and therapeutic relief; however, their clinical effectiveness, safety, and long-term benefits require further investigation. Furthermore, the intricate anatomy of the cervical spine necessitates meticulous technique and a high level of procedural expertise to mitigate risk and optimize outcomes [3].
This review aims to present an anatomically grounded and clinically relevant overview of CFJ interventions. It explores the structural and pathophysiological foundations of CFJ-mediated pain, examines interventional strategies currently in use, and critically appraises the existing evidence to support their application in contemporary pain management practice.
BASIC ANATOMY
The cervical spine comprises seven vertebrae (C1-C7), forming the superior segment of the vertebral column. It is characterized by unique anatomical adaptations that provide both structural support for the head and extensive mobility in multiple planes. The upper cervical vertebrae, C1 (atlas) and C2 (axis), exhibit distinctive morphologies. The atlas lacks a vertebral body and spinous process, instead forming a bony ring with anterior and posterior arches. It articulates with the occipital condyles at the atlanto-occipital joints, which permit nodding movements in the sagittal plane. The axis is defined by the odontoid process (dens), which projects superiorly to articulate with the anterior arch of the atlas. The atlanto-axial joint, consisting of one median and two lateral synovial joints, allows significant axial rotation. From C3 to C7, the typical cervical vertebrae are characterized by small, rectangular vertebral bodies, short bifid spinous processes, and transverse processes that contain transverse foramina [4]. These foramina transmit the vertebral arteries from C6 to C1 as they ascend toward the cranial cavity (Fig. 1). A distinctive feature of the subaxial cervical spine is the presence of uncinate processes on the superolateral margins of the vertebral bodies, forming uncovertebral clefts or joints with the vertebral body above. The uncovertebral joints help maintain both the mobility and stability of the cervical motion segments, and they also play a role in shielding the contents of the intervertebral foramina from protruding disc material [5].
Intervertebral discs are present between C2 and C7 at cervical region are composed of an outer annulus fibrosus and inner nucleus pulposus. These discs contribute to shock absorption and motion between adjacent vertebrae.The facet (zygapophysial) joint is a synovial joint formed between the articular processes of adjacent vertebrae (Fig. 1). In the cervical spine, these joints have a simpler articular surface compared with those in the lumbar region, and their fibrous capsules are longer and looser. Isolated cervical facet joints are highly mobile, but in an intact motion segment, their movement is restrained by surrounding ligaments, capsules, discs, and vertebral bodies, ensuring segmental stability [6].
The cervical spine is stabilized by a complex system of ligaments. The anterior longitudinal ligament is a robust band along the anterior surfaces of the vertebral bodies, extending from the basilar part of the occipital bone to the anterior tubercle of C1 and the anterior aspect of C2, and then continuing caudally. The posterior longitudinal ligament runs along the posterior surfaces of the vertebral bodies within the vertebral canal, from C2 to the sacrum, and is continuous superiorly with the tectorial membrane. The ligamentum flavum, connecting the laminae of adjacent vertebrae, is thin, broad, and elongated in this region. The supraspinous ligament is largely diminished and represented by the ligamentum nuchae, which courses along the tips of the cervical spinous processes. Distinct interspinous ligaments are largely absent in the cervical region, replaced by the median septum of the ligamentum nuchae between spinous processes. Intertransverse ligaments are sparse and irregular, with most fibers replaced by intertransverse muscles [4]. In the upper cervical spine, the transverse ligament of the atlas secures the dens against the anterior arch of C1, and the alar ligaments extend from the dens to the occipital condyles, restricting excessive rotation and lateral flexion.
These anatomical characteristics form the structural and functional bases for the complex innervation patterns of CFJs, which are essential for understanding both motion and pain pathways.
CERVICAL FACET INNERVATION
General description
In the cervical spine, each spinal nerve bifurcates into a ventral and dorsal ramus, forming the anatomical foundation for segmental musculoskeletal and articular innervation. The dorsal ramus further divides into a lateral branch and a medial branch. The lateral branch mainly supplies the splenius and longissimus muscles, while the medial branch innervates the facet joints and deep paravertebral muscles [7]. The medial branch courses along an osseous groove situated dorsolateral to the facet joint, where it is partially covered by the tendon of the semispinalis capitis muscle [8]. Along this pathway, it gives rise to branches that supply the facet joint capsule and deep paravertebral muscles, and it may occasionally issue small cutaneous fibers. These cutaneous contributions are more variable and less prominent than those observed in the thoracic region [7,9].
Each cervical facet joint is primarily innervated by the medial branch at the same spinal level, although fibers from the immediately superior level may occasionally contribute, resulting in partial overlap [7,8]. This partial overlap helps explain the potential for pain referral over a broad area and provides the anatomical rationale for targeting two adjacent levels during diagnostic medial branch blocks (MBBs) [10,11].
Level-specific innervation
In the upper cervical region, the facet joints exhibit a complex pattern of innervation. The C1-C2 facet joint is supplied by a plexus-like network of dorsal rami, which may include multiple articular branches from the C2 and C3 dorsal rami [7,9]. This intricate arrangement, together with an accompanying dense venous network, makes precise identification of individual articular branches technically challenging [9]. Convergence of afferent fibers from these upper cervical facet joints can contribute to referred pain in the occipital and suboccipital regions, providing a recognized mechanism underlying cervicogenic headache [10]. Clinical guidelines emphasize that interventional procedures targeting these facet joints require careful imaging guidance due to the complex neurovascular anatomy of the upper cervical region.
In the mid to lower cervical spine, the medial branches follow a more consistent course, coursing around the articular pillars to supply the facet capsules [8]. The dual supply pattern may persist through the lower cervical levels, although plexus-like interconnections are less pronounced than in the upper segments [9]. At the cervicothoracic junction, the articular branches become smaller and primarily serve adjacent paraspinal muscles, providing limited input to the facet joint itself [8]. In addition, a recent histological study has identified direct articular branches arising from the dorsal root or dorsal ramus, particularly in the mid and lower cervical spine [9]. These branches bypass the medial branch and contribute directly to the joint capsule, which may explain incomplete pain relief after medial branch neurotomy [12-14].
Overall, the overlapping and segmentally organized innervation of the CFJs underlies both the clinical presentation of referred pain and the procedural principles guiding targeted interventions.
PATHOPHYSIOLOGY OF CFJ-MEDIATED PAIN
CFJ-mediated pain arises from a complex interplay of mechanical, inflammatory, and neurophysiological mechanisms. Among these, abnormal loading of the facet capsule, particularly during whiplash injury or repetitive strain, plays a central role in initiating pain cascades. Mechanical overstretching of the facet joint capsule, particularly beyond 20% strain, can disrupt collagen fiber alignment and initiate nociceptive signaling, even without ligament rupture [15]. This damage is not dependent on rupture but involves fiber realignment, tissue laxity, and altered strain fields within the ligament. Regions of collagen fiber realignment have been correlated with subsequent neuronal activation and pain behavior in experimental models [16]. The capsular ligament of the CFJ is innervated by dense networks of Aδ and C-fiber afferents [17]. When mechanically stimulated, these fibers relay nociceptive information from the periphery to the dorsal root ganglia (DRG) and subsequently to the dorsal horn of the spinal cord [17]. Activated afferents exhibit increased expression of neuropeptides such as substance P, calcitonin gene-related peptide, and protein gene product 9.5, all of which contribute to heightened neuronal excitability and pain transmission [18]. The degree of afferent activation is strongly influenced by the local mechanical environment within the capsule, including the magnitude and distribution of strain [19]. Sustained afferent input from the facet joint initiates peripheral sensitization, characterized by enhanced sensitivity of primary nociceptors to normally innocuous stimuli [20]. Over time, persistent stimulation leads to central sensitization within the spinal cord, involving hyperexcitability of dorsal horn neurons, expansion of receptive fields, and reduction of inhibitory synaptic transmission. These central changes are associated with chronic pain syndromes and manifest as hyperalgesia and allodynia. In animal models, this is accompanied by increases in excitatory synapse density, reductions in inhibitory synapses, and phenotypic shifts in dorsal horn neuron populations [21].
Painful mechanical loading of the CFJ triggers the release of molecular mediators that amplify nociceptive signaling. Concurrently, inflammatory cytokines and neurotrophins, such as nerve growth factor (NGF), brain-derived neurotrophic factor, and interleukins, are elevated in the joint, DRG, and spinal cord [22]. These molecules contribute to prolonged pain signaling and may serve as therapeutic targets. In particular, inhibition of NGF shortly after injury has been shown to prevent both behavioral hypersensitivity and spinal hyperexcitability [23]. Chronic mechanical stress and inflammation contribute to structural degeneration of the CFJ, including cartilage thinning, osteophyte formation, and synovial hypertrophy [24]. These degenerative changes alter joint biomechanics and perpetuate nociceptive input, establishing a cycle of pain persistence. The loss in intervertebral disc height further increases the axial load on the CFJ, exacerbating joint degeneration and reinforcing chronic pain pathways. As a result, both acute injury and long-standing degenerative processes converge on a common pathophysiological pathway leading to persistent CFJ pain [25].
DIAGNOSTIC APPROACHES TO CFJ-MEDIATED PAIN
The clinical diagnosis of CFJ-mediated pain remains difficult, as no single symptom, sign, or imaging modality can definitively identify the facet joint as the pain generator. Therefore, a comprehensive diagnostic strategy combining careful clinical evaluation, controlled diagnostic blocks, and judicious use of imaging is required.
Clinical presentation
Patients with CFJ-mediated pain usually present with axial neck pain radiating to the occiput, trapezius, or interscapular regions, rarely beyond the shoulder. Pain is aggravated by extension, rotation, or lateral bending, and local facet line tenderness may be present but is nonspecific. Neurological deficits are uncommon, and their presence suggests an alternative pathology [26]. In the acute phase (e.g., whiplash injury), pain is typically diffuse with spasm and restricted motion, making it difficult to distinguish from myofascial or ligamentous injury [27]. In the chronic phase, pain is more localized, consistently provoked by specific movements, and often follows characteristic referred patterns (e.g., occiput for C2-C3, scapular region for C6-C7) [27].
Differential diagnosis
CFJ-mediated pain should be distinguished from pain with other cervical pain sources. Discogenic pain is usually midline and may be associated with magnetic resonance imaging (MRI) findings of annular fissures or internal disc disruption. Radicular pain follows a dermatomal distribution and is accompanied by neurological changes. In contrast, myofascial pain is often diffuse and associated with trigger points [27]. Red flags, such as systemic symptoms, unexplained weight loss, or progressive neurological deficits, should prompt evaluation for infection, fracture, or malignancy [29].
Notably, CFJ-mediated pain often overlaps with shoulder disorders, especially in the scapular and deltoid regions, leading to diagnostic ambiguity. In such cases, a stepwise approach—including careful history taking, focused physical examination, selective imaging, and confirmatory diagnostic injections—can help differentiate cervical spine pathology from intrinsic shoulder conditions [30].
Diagnostic blocks
MBBs are regarded as the reference standard for diagnosing CFJ-mediated pain. MBBs provide functional confirmation of facet joint involvement by selectively anesthetizing the medial branches innervating the facet joints. A reduction in pain by 50% or more following the block is regarded as a positive response [12].
The key to diagnostic accuracy is precise needle placement under fluoroscopic guidance. As cervical medial branches are small, variable, and adjacent to bony and soft tissue structures, accurate targeting is essential to avoid false results and to identify the facet joint as the pain source [27,31]. Experimental studies have further elucidated the role of the cervical medial branch in pain transmission. Animal models and human saline injection studies have reproduced characteristic referred pain patterns, supporting the clinical relevance of these nerves as pain mediators [32]. These experimentally induced patterns correspond closely to those observed in patients with CFJ-mediated pain and have been depicted in anatomical illustrations and pain maps (Fig. 2).
In clinical practice, when the symptom distribution in a patient resembles these referred patterns, the findings may provide diagnostic value, suggesting likely involvement of the cervical level; however, confirmatory diagnostic blocks remain essential. Intra-articular facet joint injections (FJIs) have also been applied as a diagnostic method, but their role remains less well-established compared with that of MBBs [26].
Role of imaging and limitations
Imaging is useful in the initial evaluation of patients with suspected CFJ-mediated pain, mainly to exclude alternative causes and identify structural changes. Radiographs can show degeneration or malalignment, computed tomography (CT) delineates bony hypertrophy or osteophytes, and MRI is valuable for assessing the discs, cord, and nerve roots [28,33]. However, radiographic abnormalities often appear in asymptomatic individuals, and patients with CFJ-mediated pain may show minimal or no changes on CT or MRI [27]. While ultrasound (US) is being increasingly used, its current value lies primarily in guiding therapeutic procedures rather than in diagnosis [34]. Recent studies show that US-guided cervical facet interventions achieve high accuracy and efficiency, with favorable safety profiles and outcomes [35]. By providing real-time visualization of soft tissues and vascular structures without radiation exposure, US enhances the accuracy and safety of MBBs and other facet interventions, serving as a procedural adjunct rather than a diagnostic modality [36]. Thus, imaging alone cannot confirm the diagnosis. Diagnostic blocks remain the reference standard, while imaging serves as a complementary tool that provides anatomical context, guides procedural planning, and helps identify coexisting pathology [37].
CLINICAL EFFICACY OF CFJ INTERVENTIONS
MBBs
MBBs are widely applied in clinical practice for diagnostic purposes, with robust evidence supporting their validity and clinical effectiveness [12]. Fluoroscopic guidance remains the standard for accurate targeting and minimizing false results [27]. As cervical medial branches are small and anatomically variable, diagnostic accuracy depends on precise needle placement and the use of very small anesthetic volumes, which provide specificity but also carry the risk of error if spread occurs [31].
To further improve diagnostic validity, controlled blocks using both short-acting and long-acting anesthetics have been employed, with concordant relief matching the anesthetic profile supporting a true-positive response [38]. Although traditionally used as a diagnostic tool, MBBs may also provide therapeutic benefit. Several trials have shown meaningful, albeit time-limited, pain relief and functional improvement. Repeated blocks can extend benefit, but durability is generally inferior to that of radiofrequency ablation (RFA) [39,40]. Accordingly, guidelines continue to emphasize MBBs for diagnostic confirmation, while acknowledging their potential therapeutic role in selected patients [28].
FJIs
FJIs have been explored as both a diagnostic and therapeutic modality for CFJ-mediated pain. Unlike MBBs, which anesthetize the nerves innervating the joint, FJIs directly target the joint capsule with local anesthetic and sometimes corticosteroid. Their diagnostic utility is limited due to technical challenges: CFJs are small, variably oriented, and difficult to access, with frequent leakage to adjacent structures that reduces specificity [27,31]. Fluoroscopic studies have demonstrated a high incidence of extra-articular contrast leakage during cervical facet arthrograms, further underscoring the limitations of diagnostic accuracy [41].
As a result, FJIs are technically more demanding than MBBs, and this complexity may contribute to their relatively infrequent use in routine clinical practice [26]. Therapeutically, intra-articular corticosteroid injections have shown inconsistent results. While early randomized studies failed to demonstrate sustained improvement following intra-articular corticosteroid use compared with placebo [38], later observational studies have suggested that some patients may experience short-term relief, even though whether the relief is lasting remains questionable [42]. A recent lumbar cohort study further highlighted that MBBs are easier to perform and more accessible than FJIs, a consideration likely relevant to the cervical spine as well [43].
Although FJIs are often used as an initial intervention in practice, current guidelines do not recommend their use as first-line treatment owing to their limited diagnostic specificity and inconsistent benefit, especially compared with those of MBBs and RFA. They may still be considered selectively, particularly when other interventional options are not feasible [28,37].
RFA
RFA is widely regarded as the most effective interventional treatment for patients with confirmed CFJ-mediated pain [44]. By producing thermal coagulation of the medial branch nerves, RFA provides longer-lasting pain relief compared with MBBs or FJIs [12]. Randomized trials and long-term observational studies support its efficacy, showing pain relief and functional improvement for 6-12 months, with some patients benefiting for up to 2 years [12]. Repeat procedures generally provide outcomes comparable to those following the initial treatment, reinforcing the role of RFA as a durable intervention [45,46].
Overall, the evidence strongly supports RFA as the definitive intervention for appropriately selected patients with CFJ-mediated pain [28].
Adjunctive interventions
Beyond the established methods, various adjunctive or alternative treatments are occasionally used in clinical practice for patients with CFJ-mediated pain. Although the evidence supporting the efficacy of these techniques is less robust, they remain part of the therapeutic landscape, particularly in cases where conventional approaches are insufficient or contraindicated. Epidural steroid injections may provide some benefit in patients with mixed pain syndromes when discogenic changes or radiculopathy coexist, but they are not specific for facet-mediated pain [47]. Trigger point injections can be useful when myofascial pain is present [48], and acupuncture or other complementary therapies have also been reported to improve symptoms in selected patients; however, the evidence base is weak and current guidelines do not recommend them as standalone treatments [37].
Furthermore, posterior neck pain may arise from multiple structures beyond the CFJs, including the shoulder girdle and paraspinal muscles; hence, careful differential diagnosis is essential when considering these adjunctive therapies [49,50]. Overall, such interventions are best regarded as supplementary rather than primary treatments, and may be integrated into an individualized multimodal management strategy.
Emerging techniques
Beyond conventional facet interventions, several newer techniques have been investigated. Pulsed radiofrequency (PRF) offers a non-destructive alternative, with early studies reporting modest benefit and good safety; however, long-term efficacy is uncertain [51]. Hybrid techniques combining continuous RFA with PRF or targeting multiple sites have also been reported, but evidence is limited to small series studies [52].
Cooled radiofrequency (CRF) produces larger lesions through internal cooling, with animal studies showing that water-circulating probes create greater lesion length and axonal injury compared with RFA [53]. CRF has also emerged as a potential option as it may compensate for suboptimal probe alignment with the target nerve by creating larger lesion sizes through internally cooled probes. A recent retrospective analysis of 298 cervical CRF procedures showed pain improvement in 85% of cases with an average relief duration of 6.7 months [54]. A case report suggests benefit, but evidence remains sparse, especially for the cervical spine [55].
Regenerative therapies such as platelet-rich plasma or stem cell injections aim to restore joint integrity rather than simply block pain pathways. Preliminary findings are promising, yet current evidence is restricted to small observational studies [56].
TECHNICAL ASPECTS
Imaging guidance
Fluoroscopy is the reference standard for cervical facet interventions, allowing precise identification of bony landmarks and needle placement with contrast injection [58]. US has emerged as a valuable alternative, avoiding radiation and enabling real-time visualization of vascular and soft tissues [36]. Comparative studies show good accuracy and safety, but fluoroscopy remains superior for deeper joints where the utility of US is limited owing to acoustic shadowing [31]. CT offers superior anatomical detail but is reserved for select cases as it involves radiation exposure and higher cost [59].
Needle placement
The accuracy of needle placement is critical to both the diagnostic accuracy and therapeutic efficacy of cervical facet interventions. For MBBs, the needle is positioned along the articular pillar following the expected course of the medial branch (Fig. 3) [58]. MBBs follow the medial branch trajectory, whereas FJIs require intra-articular access (Fig. 4). This approach is technically more demanding owing to the small size and variable orientation of CFJs, with a high incidence of extra-articular leakage demonstrated in fluoroscopic arthrogram studies [41,60]. For RFA, precise alignment of the cannula parallel to the target medial branch is essential for creating effective and reproducible lesions, with the lesion size also influenced by adequate temperature and duration parameters (Fig. 5) [61].
Injectate characteristics: volume and steroid use
Injectate volume and the use of corticosteroids influence both diagnostic specificity and therapeutic effect. For MBBs, injectate volumes of 0.5 ml or less are recommended to minimize spread to adjacent structures and preserve diagnostic accuracy [31]. FJIs typically use 0.5-1 ml, as higher volumes increase the risk of leakage beyond the joint capsule [62].
The role of corticosteroids in these injections remains controversial. While their anti-inflammatory properties may theoretically provide therapeutic benefit, controlled studies have failed to show long-term efficacy compared with placebo [38]. Early evidence has demonstrated no added value of intra-articular corticosteroids for chronic cervical facet pain [42], and current guidelines generally recommend excluding steroids in purely diagnostic blocks, while allowing their selective use for therapeutic purposes [28].
COMPLICATIONS AND CLINICAL PEARLS
Cervical facet interventions are common, with studies estimating that CFJs are involved in approximately 25-65% cases of chronic neck pain [25]. They are generally safe when performed with appropriate technique and imaging guidance, but potential complications must be recognized. Minor adverse events include transient pain, local bleeding, vasovagal reactions, and temporary numbness or dysesthesia [42]. Infections are rare but possible, necessitating strict aseptic technique [63]. Serious neurological injury, although uncommon, has been reported with malpositioned needles, intravascular injection, unintended spread of injectate, and even rare cases such as transient tetraplegia after cervical facet injection performed without imaging guidance [64,65]. The proximity of the vertebral artery, spinal cord, and exiting nerve roots underscores the importance of precise imaging guidance and small injectate volumes. Interventional procedures such as RFA carry additional risks including neuritis, deafferentation pain, and rarely, motor deficits due to collateral thermal injury [66,67]. Careful cannula placement with adjunctive sensory and motor testing can minimize these risks, while post-procedural soreness is frequent but typically resolves spontaneously [68].
Clinical pearls include keeping injectate volumes low to preserve diagnostic accuracy, avoiding sedation during diagnostic blocks, and using controlled comparative blocks when diagnostic certainty is critical [62]. In the cervical spine, although the prevalence of facet joint-mediated pain is lower than in the lumbar region [25], complications can be devastating when they occur. Symptoms are often confused with those from the shoulder or paraspinal muscles, making it essential to confirm true facet joint origin pain. Clear documentation of baseline pain and function with structured follow-up improves the assessment of treatment response [5].
Finally, individualized approaches to patient selection, consideration of comorbidities, and multimodal planning remain essential for optimizing outcomes.
CONCLUSION AND FUTURE DIRECTIONS
CFJs are a notable source of chronic neck pain. Advances in anatomy, imaging, and interventional techniques have improved the ability to diagnose and treat facet-mediated pain. MBBs, FJIs, and RFA remain the main evidence-based options, with RFA providing the most durable relief when performed precisely and in well-selected patients.
Emerging methods such as PRF or CRF, regenerative therapies, and advanced imaging show promise but lack strong evidence in the cervical spine. Future research should prioritize high-quality trials to clarify their long-term efficacy and safety. As neck pain often overlaps with myofascial, discogenic, or shoulder disorders, careful differential diagnosis is essential.
Looking ahead, multimodal strategies combining interventions with rehabilitation, medications, and patient-centered care will be key. Advances in imaging, lesioning, and biologics may expand options; however, evidence-based, patient-tailored care supported by multidisciplinary collaboration will remain essential.
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