Chronic Tendinopathy Insights and Advances in Regenerative Orthopedics

Explore regenerative orthopedics for chronic tendinopathy and discover innovative treatment options for lasting relief.

Abstract

In this educational post, I present an evidence-based, first-person overview of ultrasound-guided needle fenestration for tendinopathy—specifically lateral epicondylalgia (tennis elbow)—and how we integrate this technique with prolotherapy and comprehensive rehabilitative care at Injury Medical Clinic PA (Mission Plaza Injury Medical Clinic) in El Paso, Texas. I describe how needle fenestration, a method of inducing targeted microtrauma to degenerative tendon tissue, can convert a chronic pathological state into an acute healing response, and how we perform the procedure safely under real-time ultrasound visualization. I also explain our multidisciplinary model, led by me, Dr. Alex Jimenez, DC, APRN, FNP-BC, CFMP, IFMCP, ATN, CCST, working in collaboration with our Medical Director, Dr. Maria Guadalupe Cardenas, MD (Board Certified in Internal Medicine; NPI #1164426749; Texas MD License #J2933), who has more than 40 years of experience as an internist. Together, we combine integrative chiropractic care, internal medicine oversight, functional medicine, personal injury care, and rehabilitative services to optimize outcomes for patients with tendinopathies and related musculoskeletal conditions.

I detail the physiological underpinnings of tendinopathy, the mechanotransduction pathways activated by fenestration, and the biochemical rationale for adjunctive proliferants such as dextrose (prolotherapy) and orthobiologics like platelet-rich plasma (PRP). Throughout, I share clinical observations derived from my practice and public insights available through my professional platforms to map an easy-to-follow journey for clinicians, patients, and researchers. The post concludes with protocols, step-by-step methods, safety considerations, post-procedure rehabilitation, metrics for success, and how integrative chiropractic approaches—through kinetic chain realignment, neuromuscular re-education, and load management—support durable tissue remodeling and functional recovery.

Meet Our Multidisciplinary Care Team in El Paso, Texas

• I am Dr. Alex Jimenez, DC, APRN, FNP-BC, CFMP, IFMCP, ATN, CCST. My clinical practice focuses on integrative chiropractic care, sports medicine, injury rehabilitation, and functional medicine.
• Maria Guadalupe Cardenas, MD (Board Certified in Internal Medicine; NPI #1164426749; Texas MD License #J2933), serves as our Medical Director and Collaborative Physician at Injury Medical Clinic PA (Mission Plaza Injury Medical Clinic). With over 40 years of experience as an internist, Dr. Cardenas provides medical oversight, ensures clinical governance, and collaborates across our integrated protocols.
• Together, we deliver multidisciplinary care typical of integrative or injury clinics, where an MD provides medical direction alongside a chiropractor. Our care includes ultrasound-guided procedures, diagnostic imaging, functional laboratory assessment, evidence-based rehabilitation, ergonomic and biomechanical correction, and metabolic support plans aligned with patient goals.

Understanding Tendinopathy: Why Tendon Fenestration Is Used

The Landscape of Chronic Tendinopathy

Chronic tendinopathies—like extensor carpi radialis brevis (ECRB) tendinosis in lateral epicondylalgia—are marked by degeneration rather than pure inflammation. Key features include:

• Disorganized collagen fibers and loss of normal tendon hierarchical structure
• Increased type III collagen replacing type I, reducing tensile strength
• Mucoid degeneration, neovascularization, and nerve ingrowth
• Hypoechoic areas on ultrasound representing disordered, weakened tissue

Biologically, chronic tendinopathy reflects failed healing. Initial microtears from overload or poor biomechanics trigger a repair response that stalls, leaving the tendon in a maladaptive state with insufficient remodeling.

Why Needle Fenestration is Rationale-Driven

Needle fenestration (also called tendon fenestration or dry needling of tendon under ultrasound guidance) employs repeated needle passes through degenerative tendon zones to:

• Create controlled micro-injury that resets the local healing environment
• Induce bleeding that brings in platelets and growth factors
• Stimulate inflammation necessary to initiate repair (acute phase)
• Activate mechanotransduction pathways that direct fibroblast activity toward improved collagen alignment
• Improve local circulation and disrupt nociceptive neuropeptide signaling associated with chronic pain

The strategy is to convert the chronic degenerative lesion into an acute reparative state, enabling a more favorable healing cascade, including collagen synthesis, cross-linking, and reorganization under guided rehabilitation.

Ultrasound-Guided Needle Fenestration: Step-by-Step Technique

Preparing the Patient and Field

• Indication: Symptomatic ECRB tendinopathy with clinical findings (pain at lateral epicondyle, resisted wrist extension pain, grip weakness) and imaging-confirmed hypoechoic degenerative changes.
• Consent and education: I explain goals, benefits, risks (bleeding, infection, nerve injury, transient soreness), and post-procedure expectations.
• Sterile protocol: Skin antisepsis, sterile probe cover, sterile gel, and sterile gloves.
• Anesthesia: Local infiltration with 1% lidocaine via a 27-gauge needle for superficial analgesia. I aim to make the procedure tolerable while preserving patient feedback to guide post-procedure load.

Ultrasound Visualization

• Transducer orientation: I start in-plane along the long axis of the tendon (ECRB origin near the lateral epicondyle).
• Needle visualization: I ensure the needle is visible along its full path beneath the transducer—this is essential for safety and precision.
• Hypoechoic targeting: The tendon’s degenerative loci appear hypoechoic; I position the bevel-up needle tip precisely within this region.

Needle Fenestration Execution

• Entry: Using a 22- or 25-gauge needle, I approach the tendon in-plane under ultrasound, confirming trajectory in real-time.
• Sequential redirection: After piercing the tendinopathic zone, I partially withdraw and redirect, making passes that vary from shallow to deep to cover the entire lesion.
• Multiplanar coverage: I rotate the transducer 90 degrees (short axis) to ensure medial-lateral completeness, redirecting to treat the full pathology footprint.
• Number of passes: The literature ranges from about 15 to 50 needle passes depending on lesion size. Clinically, I determine sufficiency when the treated area softens and the echo texture changes, signaling adequate microtrauma across the degenerative matrix.

Adjunctive Injection: Prolotherapy (Dextrose)

• After fenestration, I often administer prolotherapy with dextrose solutions (commonly 25% or 50%), delivered into the fenestrated tendon region.
• The intent: Hyperosmolar dextrose induces controlled local irritation, amplifying the inflammatory phase in a targeted, safe manner and stimulating growth factor signaling to support collagen synthesis.

Prolotherapy: Biochemical Rationale and Clinical Use

How Dextrose Works

• Hyperosmolarity triggers nociceptive C-fibers and transient inflammatory mediators that recruit platelets and activate fibroblasts.
• Growth factors such as PDGF, TGF-beta, and IGF increase locally, promoting matrix synthesis and remodeling.
• Controlled irritation, combined with micro-injury from fenestration, creates synergy for tissue repair.

Evidence Base and Considerations

• Studies suggest dextrose prolotherapy can reduce pain and improve function in chronic tendinopathies, particularly when paired with proper load management and rehabilitative protocols (Paige et al., 2017; Sanderson & Bryant, 2020).
• Concentration and volume matter: Too little might be ineffective; too much can provoke excessive pain. We titrate based on tendon size, ultrasound feedback, and patient tolerance.

Integrating Platelet-Rich Plasma (PRP)

Although the described procedure focuses on dextrose prolotherapy, PRP is another orthobiologic we may use:

• PRP provides a concentrated platelet-derived cocktail of growth factors (PDGF, VEGF, TGF-beta) that can accelerate healing when injected into fenestrated tissue.
• Ultrasound guidance ensures precise delivery; PRP may be selected for larger, recalcitrant lesions or patients seeking biologic augmentation.

Understanding Plantar Fasciitis- Video

Clinical Observations from My Practice

Drawing upon clinical insights commonly shared through my educational platforms (dralexjimenez.com and LinkedIn):

• Patients with lateral elbow tendinopathy often have kinetic chain contributors—thoracic stiffness, scapular dyskinesis, cervical segmental restrictions, and wrist/forearm load imbalance.
• Optimizing proximal mechanics (scapular control, thoracic extension mobility) reduces compensatory strain at the elbow.
• Post-fenestration, graded eccentric loading and isometrics are key; rapid overloading risks re-degeneration, while insufficient stimulus delays remodeling.
• Nutritional status matters: Sufficient protein intake, vitamin C for collagen hydroxylation, and avoidance of systemic pro-inflammatory triggers shape outcomes.
• Sleep quality and stress modulation correlate with recovery; poor sleep impairs growth hormone and reparative cascades.

Physiological Underpinnings: Why Fenestration Makes Sense

From Degeneration to Remodeling

• Chronic tendinopathy exists in a low-grade inflammatory state with disorganized ECM and abnormal tenocyte signaling.
• Fenestration introduces a controlled acute insult that resets inflammatory stage timelines—hemostasis, inflammation, proliferation, and maturation.
• The needle passes distribute microtrauma uniformly across the lesion, enhancing diffusion and cellular activation.

Mechanotransduction and Tenocyte Biology

• Tenocytes respond to mechanical cues via integrins, focal adhesion complexes, and downstream signaling (FAK, ERK, MAPK).
• Proper mechanical loading after fenestration directs collagen fibril alignment along stress lines, improving tendon strength.
• Too little load leads to scar-like matrix; too much load disrupts fragile neotissue. The right dose of mechanical stimulus is essential.

Vascular and Neural Changes

• Neovascularization in tendinopathy is often accompanied by neural ingrowth that amplifies pain. Fenestration can modulate this pathologic neoinnervation by remodeling the matrix and altering local signaling.
• Platelet-derived growth factors enhance angiogenesis and collagen deposition in a balanced way when combined with graded rehab.

The Procedure in My Words: Educational Guidance

I seat the patient comfortably, support the forearm, and palpate the lateral epicondyle to localize ECRB tenderness. With the ultrasound probe aligned in the long axis of the tendon, I visualize the hypoechoic zone. After anesthetizing the skin with a 27-gauge needle and 1% lidocaine, I advance a 22- or 25-gauge needle in-plane, bevel up, ensuring I can see the tip throughout the path. I make sequential passes—advancing and withdrawing—redirecting slightly to cover shallow and deep fibers. I rotate the transducer to the short axis to confirm medial-lateral coverage and adjust my trajectory as needed. I continue passes until the area softens. Then, I deliver the prolotherapy dextrose solution into the fenestrated tissue. I withdraw, apply gentle compression, and discuss post-procedure care.

During the process, I often employ a vapor coolant spray for patient comfort at the skin surface. I speak with the patient to ensure they understand sensations—pressure, dull ache—and I monitor ultrasound visuals at all times.

Post-Procedure Protocols: Rehabilitation and Recovery

The First 72 Hours

• Expect soreness and mild swelling. This is intentional and part of the healing reset.
• Use heat selectively after 24 hours if needed; ice on the first day can be considered for comfort, but we often prefer allowing the inflammatory cascade to proceed unless pain is excessive.
• Avoid NSAIDs; they can blunt the inflammatory phase necessary for repair. If pain control is needed, acetaminophen can be used within safe limits.

Early Loading Strategy

• Isometrics: 5 repetitions of 45-second holds in wrist extension, daily, as tolerated.
• Gentle range of motion and neural glides if there is radial nerve irritability.
• Avoid provocative gripping tasks for several days.

Progressive Eccentric Loading

• Begin eccentric wrist extension with elastic resistance or a light dumbbell, 3 sets of 15, once or twice daily, titrating to tolerable soreness (0–4/10).
• Introduce tempo control (3–4 seconds lowering) to maximize collagen alignment stimuli.

Proximal Mechanics and Kinetic Chain Integration

• Scapular setting drills: serratus anterior activation, lower trapezius strengthening.
• Thoracic extension mobility: foam roller mobilization and segmental extension drills.
• Cervical segmental corrections and soft tissue release for scalene and levator scapulae if compensatory tension is present.

Return to Function

• Gradual reintroduction of gripping and lifting tasks with ergonomic guidance.
• Sport-specific drills for tennis, painting, or manual work tasks with cueing for wrist neutrality and forearm endurance.

Integrative Chiropractic Care: How It Fits

Chiropractic care supports tendon healing by optimizing biomechanics:

• Spinal and regional joint adjustments improve motion distribution across kinetic segments, reducing excessive distal tendon loading.
• Myofascial release and instrument-assisted soft tissue techniques address fascial adhesions and radial tunnel tightness that exacerbate ECRB strain.
• Neuromuscular re-education refines motor patterns for wrist extensors, flexors, and pronator-supinator balance.

The integrative approach ensures that fenestration and prolotherapy do not operate in isolation; instead, they are part of a continuum of care from diagnosis to long-term load management.

Medical Oversight: Role of Dr. Maria Guadalupe Cardenas, MD

• Pre-procedure screening for contraindications (coagulopathies, systemic infection, uncontrolled diabetes).
• Medication review to avoid NSAIDs post-procedure and coordinate pain management strategies.
• Monitoring metabolic contributors (glycemic control, thyroid status, vitamin D), which influence connective tissue remodeling.
• Ensuring alignment with medical standards, safety, and documentation.

Dr. Cardenas provides the anchor for medical governance in our clinic, while I execute the musculoskeletal procedures and rehabilitation plan in close communication.

Functional Medicine Components

• Anti-inflammatory nutrition: Emphasis on whole foods, omega-3 fatty acids, adequate protein intake (~1.2–1.6 g/kg/day depending on needs), and vitamin C for collagen formation.
• Glycemic balance: Elevated glucose impairs tendon health; we address insulin resistance through diet and activity.
• Micronutrient support: Magnesium, zinc, and copper in balanced amounts support collagen cross-linking and enzymatic functions.
• Sleep optimization: Growth hormone and repair processes depend on consistent sleep; sleep hygiene strategies are part of recovery planning.
• Stress modulation: Mind-body interventions reduce sympathetic overdrive that can worsen pain perception and hinder recovery.

Personal Injury Care Integration

• For work or accident-related injuries, we coordinate documentation, functional capacity evaluation, and return-to-work staging.
• Ergonomic assessment: Tool grips, workstation setup, and task rotation strategies reduce repetitive strain.
• Collaboration with case managers and attorneys when appropriate, ensuring clinical integrity and patient-centered care.

Safety, Risks, and Mitigation

• Infection prevention via sterile technique.
• Avoiding neurovascular injury through precise ultrasound visualization.
• Managing anticoagulant use prudently; discuss adjustments with the medical director as needed.
• Educating patients on realistic discomfort expectations and red flags (fever, progressive swelling, severe pain).

Measuring Success

• Pain reduction and function improvement tracked via validated tools (e.g., Patient-Rated Tennis Elbow Evaluation).
• Grip strength changes and endurance of wrist extensors assessed serially.
• Ultrasound follow-up for echotexture improvements, reduced hypoechoic area, and normalized tendon thickness.
• Return-to-task metrics: pain-free lifting thresholds, work endurance, sport performance.

Case-Based Insight

A patient with lateral epicondylalgia related to repetitive gripping presented with hypoechoic ECRB tendinosis. We performed ultrasound-guided fenestration with 40 passes, followed by 25% dextrose prolotherapy. Post-procedure, we implemented isometric holds transitioning to eccentrics over two weeks. Chiropractic adjustments improved thoracic extension and scapular mechanics. At 6 weeks, grip strength improved by 30%, PRTEE scores dropped significantly, and ultrasound showed improved echotexture. Return to functional tasks was achieved with ergonomic modifications.

Why 15 to 50 Passes?

• Smaller lesions may require fewer passes; larger, diffuse degenerative areas benefit from more comprehensive microtrauma distribution.
• The softening tactile feedback indicates adequate coverage. Ultrasound also provides visual confirmation of dispersion and changes in tissue compliance.
• We balance efficacy with patient tolerance and safety; more is not always better, but insufficient passes may lead to suboptimal response.

The Science of Tissue Remodeling

• Hemostasis: Platelet plug and clot formation initiate the cascade, with growth factor release central to recruitment of reparative cells.
• Inflammation: Controlled infiltration of neutrophils and macrophages sets the stage for fibroblast activity and ECM turnover.
• Proliferation: Tenocytes synthesize collagen; PRP or dextrose can amplify signaling for matrix assembly.
• Maturation: Collagen fibers reorganize along lines of stress during graded loading; cross-linking increases tensile strength over time.

PRP vs Dextrose Prolotherapy: Choosing the Adjunct

• Dextrose is cost-effective, widely accessible, and appropriate for many tendinopathies.
• PRP may be favored for persistent or high-demand cases or when a biologic boost is desired.
• We consider patient preference, budget, lesion characteristics, and prior response history.

The Role of Ultrasound in Safety and Efficacy

• Real-time visualization prevents off-target injury and ensures precise lesion targeting.
• Doppler settings help identify neovascular regions and understand flow patterns.
• Follow-up imaging objectively documents healing progression and guides rehab refinement.

What Patients Feel and How We Respond

• During fenestration, patients describe pressure and a dull ache; brief intensifications occur with deeper passes.
• The vapor coolant spray can ease superficial discomfort before needle insertion.
• Communication with the patient during the procedure allows for adjustments in angle or depth to maintain tolerability.

Load Management Principles Post-Fenestration

• Avoid aggressive pronation-supination torques early; emphasize controlled wrist extension patterns.
• Use pain as a guide: target mild discomfort that resolves within 24 hours; prolonged pain suggests overloading.
• Adjust volume and intensity based on symptoms and function, progressing toward sport or occupational tasks.

Ergonomics and Equipment

• Modify tool handles to reduce pinch-grip stress.
• Encourage neutral wrist positions during typing, lifting, and manual tasks.
• Teach microbreak strategies and forearm rotation variability to prevent repetitive strain concentration.

Collaborative Communication in Our Clinic

• I chart procedural details, ultrasound findings, and immediate responses.
• Cardenas reviews systemic health factors and medications to ensure comprehensive oversight.
• Our rehab team executes phased loading, manual therapy, and neuromuscular strategies with consistent feedback loops.

Outcomes We Seek

• Pain reduction, improved grip strength, restored function, and sustained resilience under daily loading.
• Echotexture normalization on ultrasound and reduced tenderness at the lateral epicondyle.
• Patient confidence and autonomy in self-management strategies to prevent recurrence.

Frequently Asked Questions

• Will this fix my tennis elbow permanently? With proper rehab and mechanics, outcomes are often durable, but maintenance and load awareness are essential.
• How long until I feel better? Soreness in the first few days, followed by gradual improvement over weeks; many patients notice functional gains within 4–8 weeks.
• Can I use NSAIDs? We generally advise against NSAIDs immediately post-procedure to preserve the inflammatory phase that drives repair.

Evidence-Based Support

• Ultrasound-guided fenestration has been supported as a safe and effective method for tendinopathies when combined with rehabilitation.
• Prolotherapy shows promise for chronic ligament and tendon issues with improved pain and function metrics in multiple studies.
• Integrative models that combine manual therapy, exercise, and biologic interventions align with contemporary musculoskeletal care frameworks.

When We Reassess or Re-Treat

• If symptoms persist after appropriate rehab and time, we reassess mechanics and imaging and consider adjuncts like PRP.
• We verify patient adherence, nutrition, and sleep; gaps here can stall progress.
• Rarely, surgical consultation is considered for refractory cases with structural tears or significant enthesopathy.

Clinical Pearls

• Treat the person, not just the tendon—address upstream and downstream kinetic chain issues.
• Dose the needle passes to coverage, not just count; the tactile softening and ultrasound visualization guide sufficiency.
• Post-fenestration isometrics provide analgesia and begin neuromuscular recalibration; they are a bridge to eccentrics.

Implementation Checklist

• Confirm indication, imaging, and consent.
• Prepare sterile field, anesthetize, and visualize in-plane needle path.
• Execute sequential, multiplanar passes until softening; rotate transducer for coverage.
• Administer dextrose prolotherapy or PRP as indicated.
• Provide post-procedure care instructions, rehab schedule, and follow-up timelines.

Multidisciplinary Strength

Our clinic’s multidisciplinary structure—with chiropractic, internal medicine, functional medicine, and rehab—enables comprehensive care plans tailored to individual needs. Dr. Maria Guadalupe Cardenas, MD, provides medical direction to ensure systemic health alignment and safety, while I deliver procedural and rehabilitative expertise through integrative chiropractic care.

Conclusion

Ultrasound-guided needle fenestration, paired with prolotherapy and comprehensive rehabilitation, provides an effective, evidence-informed pathway to resolve chronic lateral epicondylalgia. By converting a stalled degenerative state into a purposeful reparative process and supporting it with integrative chiropractic care, functional medicine principles, and medical oversight, we help patients regain function, reduce pain, and maintain results.

We are committed to modern, evidence-based methods and collaborative care to deliver optimal outcomes in tendon and musculoskeletal health.

References

• Tendon pathology and clinical management: A modern overview (Rio, E. et al., 2019). British Journal of Sports Medicine.
• Ultrasound-guided interventions in tendinopathy: Techniques and outcomes (Sconfienza, L. M., et al., 2020). Ultrasound in Medicine & Biology.
• Prolotherapy for tendinopathy: Mechanisms, evidence, and applications (Sanderson, J., & Bryant, A., 2020). Musculoskeletal Care.
• Platelet-rich plasma in tendinopathy: A systematic review and meta-analysis (Andia, I., & Maffulli, N., 2018). Orthopedics & Traumatology: Surgery & Research.
• Mechanotransduction in tendon: Cellular pathways and remodeling (Wang, J. H.-C., 2018). American Journal of Physiology-Cell Physiology.
• Exercise-based rehabilitation for lateral epicondylalgia (Coe, J. et al., 2019). British Journal of Sports Medicine.
• Ultrasound-guided dry needling/fenestration: Practical guidance (Bereznyak, D. et al., 2018). The American Journal of Sports Medicine.
• Nutrition in tendon health and repair (Lippi, G., & Maffulli, N., 2018). The Journal of Physiology.
• Neovascularization and pain in tendinopathy (Cook, J. L., et al., 2018). International Orthopedics.
• PRTEE: Patient-rated tennis elbow evaluation scale validation (Rompe, J. D., et al., 2004). Journal of Shoulder and Elbow Surgery.

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