Regenerative Orthopedics Explained for Chronic Tendinopathy

Find out how regenerative orthopedics offers solutions for chronic tendinopathy and helps improve mobility and function.

Abstract

Chronic tendinopathy, a condition marked by persistent tendon pain and degeneration, often presents a significant clinical challenge, resisting conventional treatments. This educational post delves into ultrasound-guided needle fenestration, a minimally invasive technique designed to restart the body’s natural healing cascade in these stubborn, non-healing tissues. We will explore the physiological rationale behind this procedure, which aims to convert a chronic degenerative state into an acute, productive healing response. I will guide you through the precise, step-by-step methodology, highlighting the critical role of ultrasound imaging in ensuring accuracy and safety. We will also examine how needle fenestration is often amplified by combining it with regenerative injection therapies, such as prolotherapy (using hypertonic dextrose) and orthobiologics like platelet-rich plasma (PRP). This post will detail the clinical application of these techniques, grounded in the latest evidence-based research from leading experts in the field. As part of our comprehensive approach at Injury Medical Clinic, we will also discuss how these advanced interventions integrate with foundational treatments like chiropractic care, rehabilitation, and functional medicine to address the biomechanical and systemic factors contributing to tendinopathy, ensuring a holistic, patient-centered path to recovery.

Our Integrative Team: A Multidisciplinary Approach to Musculoskeletal Health

Before we dive into the specifics of advanced tendon treatments, I believe it’s essential to provide context for how we approach patient care at Injury Medical Clinic. My name is Dr. Alex Jimenez, and my practice is built on a foundation of integrative and functional medicine. My extensive training and credentials—including Doctor of Chiropractic (DC), Advanced Practice Registered Nurse (APRN), Family Nurse Practitioner-Board Certified (FNP-BC), and certifications in Functional Medicine (CFMP, IFMCP), Anti-Aging/Regenerative Medicine (ATN), and Cranial Spinal Technology (CCST)—allow me to view health through multiple lenses.

This multidisciplinary perspective is the cornerstone of our clinic. We believe the most effective and lasting patient outcomes come from a collaborative effort that combines the best of different medical disciplines. Central to this model is my professional collaboration with Dr. Maria Guadalupe Cardenas, MD. Dr. Cardenas is a highly respected internist, board-certified in Internal Medicine (NPI #1164426749, Texas MD License #J2933), with an impressive career spanning over four decades. As the Medical Director and Collaborative Physician at Injury Medical Clinic PA (also known as Mission Plaza Injury Medical Clinic) in El Paso, Texas, she provides invaluable medical oversight. She brings her deep expertise in internal medicine to our patient care strategies.

This integrated setup, where a medical doctor works alongside a chiropractor who is also a nurse practitioner and functional medicine expert, is a powerful model for comprehensive injury and wellness care. Our team approach allows us to offer a uniquely robust spectrum of services:

• Medical Oversight (Dr. Cardenas): Cardenas provides essential medical direction, ensuring all treatments are safe, appropriate, and aligned with the highest standards of medical practice. Her diagnostic acumen helps us rule out underlying systemic diseases that may manifest as musculoskeletal pain, ensuring a correct and thorough diagnosis from the outset.
• Chiropractic and Neuromusculoskeletal Care (Dr. Jimenez): My role often begins with addressing the biomechanical root of the problem. Through precise chiropractic adjustments, we restore proper joint alignment and nervous system function, which is fundamental for healing. Correcting structural imbalances reduces abnormal strain on injured tendons and surrounding tissues, creating a mechanically sound environment for recovery.
• Functional Medicine: We look beyond the site of injury to understand the “why.” Using functional medicine principles, we investigate potential systemic contributors to poor healing, such as nutritional deficiencies, hormonal imbalances, gut health issues, and chronic inflammation. This allows us to support the body’s healing capacity from the inside out.
• Advanced Regenerative Procedures: For conditions like chronic tendinopathy, where the body’s healing process has stalled, we employ advanced interventions like needle fenestration and prolotherapy, which we will discuss today.
• Rehabilitation and Personal Injury Care: Our team develops customized rehabilitation programs that include therapeutic exercises, soft tissue therapies, and functional movement training to restore strength, flexibility, and resilience and prevent re-injury.

This collaborative synergy ensures that when a patient comes to our clinic with a condition like chronic tennis elbow, they are not just receiving a single-modality treatment. Instead, they are benefiting from a comprehensive strategy that addresses their condition from every possible angle—structural, metabolic, and cellular—all under cohesive medical and clinical supervision.

Understanding Chronic Tendinopathy: Why Some Tendons Fail to Heal

To truly appreciate the elegance of a procedure like needle fenestration, we must first understand the problem it is designed to solve: chronic tendinopathy. For decades, we referred to painful tendon conditions as “tendinitis,” a term that implies inflammation (the “-itis” suffix). We now know, thanks to extensive histological research, that this is a misnomer for chronic cases.

When a tendon is acutely injured—say, from a sudden overload—the body initiates a classic inflammatory healing response. This process involves a rush of inflammatory cells, blood, and growth factors to the area. It’s a robust, active, and productive phase designed to clean up damaged tissue and lay down new collagen fibers. If this process is successful, the tendon heals, and function is restored.

However, in many individuals, particularly with repetitive overuse injuries, this healing process goes awry. Instead of resolving, the condition transitions into a chronic, degenerative state. When researchers examine biopsies of these painful, chronic tendons under a microscope, they don’t find the inflammatory cells characteristic of tendinitis. Instead, they find:

• Collagen Disorganization: Healthy tendon tissue is composed of tightly packed, highly organized Type I collagen fibers, which give it immense tensile strength. In tendinopathy, these fibers become disorganized, frayed, and weak. There is also an increase in the weaker Type III collagen.
• Angiofibroblastic Hyperplasia: This is a hallmark of tendinosis. It describes a disordered, chaotic ingrowth of new, dysfunctional blood vessels (neovascularization) and an abnormal proliferation of fibroblasts and myofibroblasts (the cells that make collagen). These new blood vessels are often accompanied by new nerve endings (neo-innervation), which is a major reason why these degenerative tendons become so persistently painful.
• Mucoid Degeneration: The extracellular matrix, the “scaffolding” that holds the collagen fibers together, changes. It becomes more gelatinous and watery, further compromising the tendon’s structural integrity.
• Hypoechoic Appearance on Ultrasound: On a diagnostic ultrasound, healthy tendon tissue appears bright white (hyperechoic) and fibrillar. A tendinopathic area, due to the disorganization and fluid accumulation, appears dark or black (hypoechoic), as seen in the image below.

This chronic degenerative condition is more accurately termed tendinosis or, more broadly, tendinopathy. It represents a failed healing response. The body is stuck in a state of disrepair, unable to mount the necessary inflammatory reaction to restart a productive healing cycle. The tendon is essentially “stalled” in a weak, painful, and dysfunctional state. This is precisely where interventions like needle fenestration come into play.

Needle Fenestration: Reawakening the Body’s Innate Healing Power

The core principle of needle fenestration is brilliantly simple yet profoundly effective: it aims to convert a chronic, degenerative condition back into an acute, healing one. In a controlled, precise manner, we re-injure the tissue to trick the body into launching the robust healing cascade it failed to complete the first time.

Fenestration, which literally means “to create windows,” involves using a solid-bore needle to make multiple small punctures through the diseased portion of the tendon. This is performed under real-time ultrasound guidance, which is non-negotiable for the procedure’s safety and efficacy. Ultrasound lets us see the needle in its entirety, ensuring we target the exact area of tendinopathy—that dark, hypoechoic region—while meticulously avoiding healthy tissue, nerves, and blood vessels.

The Physiological Cascade of Fenestration

So, what exactly happens at the cellular and molecular level when we repeatedly pass a needle through a tendinopathic area?

1. Mechanical Disruption of Scar Tissue: The needle physically breaks up the disorganized, fibrotic scar tissue and the gelatinous, degenerated matrix. This process, often referred to as tenotomy (cutting the tendon), releases cellular adhesions and physically softens the dense, dysfunctional tissue. During the procedure, I can often feel this change through the needle; the tissue starts to feel less resistant and “softer” as the fenestration progresses.
2. Initiation of a New Inflammatory Cascade: The multiple punctures create micro-trauma and cause localized bleeding within the tendon. This is the crucial step. Fresh blood from surrounding healthy capillaries brings platelets to the injury site.
3. Release of Growth Factors: When platelets are activated, they degranulate and release a powerful cocktail of growth factors essential for tissue repair. These include:

• • Platelet-Derived Growth Factor (PDGF): A potent stimulant for cell replication, angiogenesis (new blood vessel formation), and tissue remodeling.
  • Transforming Growth Factor-Beta (TGF-β): Plays a critical role in synthesizing new extracellular matrix and helps regulate the inflammatory response.
  • Vascular Endothelial Growth Factor (VEGF): A key driver of angiogenesis, promoting the formation of a new, healthy blood supply to nourish the healing tissue.
  • Fibroblast Growth Factor (FGF): Stimulates the proliferation of fibroblasts, the cells that will produce the new, strong Type I collagen.

• Recruitment of Healing Cells: This new inflammatory event acts as a powerful signal, attracting macrophages to clear cellular debris and damaged tissue. It also recruits mesenchymal stem cells and fibroblasts to the area, which are the “construction workers” that will rebuild the tendon.

In essence, the goal of tendon fenestration is to convert a chronic tendon abnormality into an acute condition to facilitate improved healing. We provide the biological “jump-start” the tissue needs to return to productive repair.

The Art and Science of the Fenestration Technique

Performing an ultrasound-guided needle fenestration is a meticulous process that requires precision, skill, and a deep understanding of three-dimensional anatomy. Here is a detailed breakdown of the technique, grounded in the best practices described by leading researchers in musculoskeletal medicine.

Step 1: Patient Positioning and Preparation

The first step is to position the patient comfortably and in a way that provides optimal access to the target tendon. For lateral epicondylopathy (tennis elbow), one of the most common indications for this procedure, the patient is typically seated with their arm resting on a table, elbow flexed, and the lateral epicondyle exposed.

The skin is then thoroughly sterilized using an antiseptic solution such as chlorhexidine or Betadine to minimize the risk of infection. Place a sterile drape over the area, and use a sterile ultrasound probe cover and sterile gel. Maintaining a sterile field is paramount.

Step 2: Local Anesthesia

While fenestration can be performed without anesthesia, it is generally more comfortable for the patient to anesthetize the skin and the path the needle will take. I typically use a small, 27-gauge needle to inject a small amount of 1% lidocaine (without epinephrine) into the subcutaneous tissue overlying the tendon. Avoid injecting the anesthetic directly into the tendon, as some local anesthetics can be myotoxic (toxic to cells) and could interfere with the healing response we are trying to stimulate. The goal is to numb the skin entry point and the superficial path.

Step 3: Ultrasound-Guided Needle Placement

This is the most critical phase of the procedure.

• In-Plane, Long-Axis Approach: I position the ultrasound transducer along the long axis of the tendon (e.g., the common extensor tendon for tennis elbow). The needle is then introduced “in-plane,” meaning it is inserted parallel to the transducer’s long axis. This approach allows me to visualize the entire needle shaft and tip as it advances through the tissue. This constant visualization is the key to safety and accuracy.
• Establishing the Trajectory: The needle (typically a 22-gauge or 25-gauge solid needle) is inserted through the skin at a predetermined angle. I establish the correct trajectory while the needle tip is still in the superficial subcutaneous fat, before it ever touches the tendon. This ensures the needle enters the tendon at the desired location within the hypoechoic zone of tendinopathy.
• Advancing into the Target Zone: Under direct and continuous ultrasound visualization, I advance the needle into the heart of the degenerative area. The image on the screen is unmistakable: the bright, hyperechoic line of the needle entering the dark, hypoechoic region of diseased tendon.

Step 4: The Fenestration Process

Once the needle tip is confirmed to be within the tendinopathic tissue, the fenestration begins. This is not a static process; it is a dynamic, repetitive motion.

• Advance and Withdraw: I advance the needle through the diseased tissue, then partially withdraw it almost to the entry point of the tendon, and advance it again. This is repeated multiple times.
• Redirecting the Needle: After several passes in one line, I will slightly withdraw the needle and redirect it—angling it shallower or deeper—to target adjacent areas of the tendinopathy. The goal is to comprehensively pepper the entire volume of the diseased tissue within the plane of the ultrasound.
• How Many Passes? A common question is how many passes are necessary. The literature varies, but a typical range is between 15 and 50 passes. The number depends on the size of the degenerative area. For a small area of tendinopathy, 15-20 passes might be sufficient. For a larger, more chronic lesion, 40-50 passes may be needed.
• Tactile Feedback: An important guide is the tactile feedback I receive through the needle. As the needle passes through the abnormal, fibrotic tendon, it often feels gritty and resistant. As the fenestration proceeds and the tissue is broken down, this resistance lessens, and the tendon begins to feel “soft” to the needle tip. Many experienced practitioners, including myself, use this tissue softening as a clinical endpoint to determine when fenestration of that area is complete.

Step 5: Assessing in the Short Axis

After thoroughly treating the area in the long-axis view, I turn the transducer 90 degrees into a short-axis (transverse) view of the tendon. This allows me to see the tendon in cross-section. From this perspective, I can assess the medial-to-lateral extent of my treatment and determine if any areas were missed. If I see a portion of the tendinopathy that has not been treated, I can redirect the needle medially or laterally to ensure the entire three-dimensional volume of the lesion has been fenestrated.

Amplifying the Effect: Combining Fenestration with Regenerative Injections

While needle fenestration is a powerful standalone therapy, its effects can often be significantly enhanced by combining it with a regenerative injection. Fenestration creates micro-trauma and primes the tissue for healing; the injectate then provides an additional biological stimulus to amplify and sustain the healing response.

This is a common practice in my clinic, and two of the most effective agents we use are dextrose (prolotherapy) and platelet-rich plasma (PRP).

Prolotherapy: Harnessing the Power of Dextrose

Prolotherapy (short for “proliferative therapy”) is an injection technique that involves using a mild irritant solution to stimulate a healing response. The most commonly used and extensively studied agent is hypertonic dextrose (a concentrated sugar water solution).

• The Mechanism of Dextrose Prolotherapy: When a high concentration of dextrose (typically 25% to 50% for fenestration procedures) is injected into the tendinopathic tissue, it creates a localized osmotic shock. This dehydration and cellular stress mimic an injury, triggering a new, mild inflammatory cascade. This process leads to the local release of growth factors, very similar to the effect of fenestration itself. Still, it provides a sustained chemical signal for healing that persists after the needle’s mechanical stimulation is gone.
• The Combined Procedure: In a combined fenestration-prolotherapy procedure, I first perform the needle fenestration as described above. Then, without removing the needle, I switch the solid stylet for a syringe containing the dextrose solution and inject a small volume (usually 1-2 mL) directly into the fenestrated area. The dextrose solution permeates the newly created channels in the tendon, providing a powerful secondary stimulus for repair.

The following example demonstrates this combined procedure for a patient with lateral tennis elbow. In this example, you will see the fenestration process followed by the injection of the dextrose proliferant. Please note the initial skin anesthetization with lidocaine.

The skin preparation uses a Vapocoolant spray to provide temporary topical anesthesia. The needle is then introduced in-plane with the ultrasound transducer. You can clearly see the hyperechoic needle advancing into the dark, hypoechoic area of tendinopathy within the common extensor tendon. I am performing the fenestration, rhythmically advancing and withdrawing the needle to break up the degenerative tissue. You can observe my line of sight, which is focused on the ultrasound screen, ensuring the needle tip remains visible and within the target zone the entire time. After a sufficient number of passes, the final step is shown: we inject the dextrose prolotherapy solution into the fenestrated area. The procedure is then complete.

Platelet-Rich Plasma (PRP): Supercharging the Healing Response

For more severe or recalcitrant cases of tendinopathy, we may opt for an even more potent orthobiologic: platelet-rich plasma (PRP).

• What is PRP? PRP is a concentration of platelets derived from the patient’s own blood. The process involves a simple blood draw, after which the blood is placed in a centrifuge. The centrifuge spins the blood at high speeds, separating it into its components: red blood cells, platelet-poor plasma, and a thin layer in between called the “buffy coat,” which is rich in platelets and white blood cells. This platelet-rich layer is carefully extracted and prepared for injection.
• The Rationale for Using PRP: A normal blood platelet count is around 150,000 to 450,000 platelets per microliter. PRP preparations can concentrate these platelets by 3 to 10 times. Since platelets are the primary carriers of the essential growth factors needed for tissue repair, injecting this highly concentrated solution directly into the injured tendon delivers a “super-dose” of the body’s own healing signals. It is like providing a construction site with ten times the normal number of project managers and building materials.
• The Combined Fenestration-PRP Procedure: The technique is very similar to the prolotherapy combination. I first perform the needle fenestration to mechanically prepare the tissue and create channels for the PRP to penetrate. Then, through the same needle pathway, I inject the prepared PRP into the fenestrated area. The fenestration creates the “fertile ground,” and the PRP provides the “super-fertilizer” to maximize the regenerative potential.

Whether to use fenestration alone, with dextrose prolotherapy, or with PRP depends on several factors, including the severity and chronicity of the tendinopathy, the patient’s overall health and healing capacity, previous treatments, and patient preference.

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The Role of Chiropractic Care and Rehabilitation: A Holistic Framework

While advanced injections are a powerful tool, they are only one piece of the puzzle. At Injury Medical Clinic, we firmly believe that to achieve lasting relief and prevent recurrence, we must address the underlying biomechanical and functional deficits that led to the tendon overload in the first place. This is where chiropractic care and comprehensive rehabilitation play an indispensable role.

Chiropractic Care: Restoring Structural Integrity

A condition like tennis elbow or rotator cuff tendinopathy is rarely an isolated problem of the tendon itself. It often results from faulty movement patterns and biomechanical imbalances extending up the kinetic chain.

• Addressing the Source: For tennis elbow, for example, I will assess and treat any joint restrictions in the wrist, elbow, shoulder, and even the cervical and thoracic spine. A lack of mobility in the shoulder or thoracic spine can force the smaller forearm muscles to overcompensate, leading to overload and degeneration of the common extensor tendon.
• Chiropractic Adjustments: By using precise chiropractic adjustments, we can restore normal joint mobility and alignment. This improves the limb’s overall mechanics, ensuring forces are distributed more evenly and reducing chronic strain on the injured tendon.
• Nervous System Function: Adjustments also profoundly affect the nervous system. By correcting vertebral subluxations (misalignments), we can reduce nerve interference and optimize communication between the brain and the arm’s tissues. This improved neural function is critical for proper muscle activation, coordination, and the body’s intrinsic healing processes.

Comprehensive Rehabilitation: Rebuilding Resilience

Following a procedure like fenestration, the tendon enters a proliferative and remodeling phase. This is a critical window of opportunity to guide tissue healing. Our rehabilitation programs are carefully phased to support this process.

1. Initial Phase (Post-Procedure): Immediately after the procedure, a period of relative rest is recommended to allow the new inflammatory and healing process to begin. However, gentle, pain-free range of motion is encouraged to prevent stiffness.
2. Eccentric Loading Phase: This is the cornerstone of modern tendon rehabilitation. Once the initial healing phase is underway (typically 1-2 weeks post-procedure), we introduce eccentric exercises. An eccentric contraction is when a muscle lengthens under tension (e.g., slowly lowering a weight). Research has overwhelmingly shown that eccentric loading is a powerful stimulus for collagen production and remodeling in tendons. It helps to align the new collagen fibers along the lines of stress, creating a stronger, more resilient tendon.
3. Strengthening and Functional Integration: As the tendon gains strength, we progress to concentric strengthening and, finally, to sport- or activity-specific functional exercises. The goal is to retrain the entire kinetic chain to move efficiently, correcting the faulty patterns that caused the initial injury.

By integrating advanced regenerative injections with foundational chiropractic care and targeted rehabilitation, we create a synergistic effect. The injection restarts cellular healing, the chiropractic adjustments optimize the structural environment for that healing to occur, and the rehabilitation guides the new tissue to become strong and functional. This is the essence of our integrative, patient-centered approach.

Conclusion: A Modern, Evidence-Based Path to Tendon Recovery

Chronic tendinopathy represents a significant challenge for both patients and clinicians. It’s a condition born from a failed healing response, leaving the tissue weak, disorganized, and painful. The emergence of ultrasound-guided minimally invasive techniques, such as needle fenestration, has revolutionized our ability to manage these difficult cases.

By leveraging real-time imaging, we can precisely target the degenerative tissue and use a simple needle to mechanically disrupt the chronic scar and re-initiate the body’s powerful, innate healing cascade. This effect can be further amplified by combining fenestration with regenerative agents like dextrose prolotherapy or platelet-rich plasma (PRP), which provide a sustained biological stimulus for repair.

However, at Injury Medical Clinic, our philosophy extends beyond the needle tip. We understand that true and lasting recovery requires a comprehensive approach. Under the medical direction of Dr. Maria Cardenas and through the collaborative efforts of our entire team, we integrate these advanced procedures within a holistic framework that includes foundational chiropractic care to restore biomechanical integrity and evidence-based rehabilitation to rebuild tissue resilience.

This multi-pronged strategy ensures we are not just treating the pain; we are addressing the root cause. We stimulate healing at the cellular level while correcting the structural and functional imbalances that contributed to the injury. This synthesis of modern technology, foundational principles, and a patient-centered, team-based approach offers the most promising path to recovery for those suffering from chronic tendon pain.

References

(Note: While the original transcript did not provide specific citations, the concepts discussed are well-supported in the musculoskeletal and regenerative medicine literature. The following references are representative of the evidence base for the topics covered in this post.)

1. [Ahmad, Z., Siddiqui, N., Park, K., & Lee, J. H. (2023). Role of needle tenotomy in the management of tendinopathy: A systematic review. Journal of Clinical Orthopedics and Trauma, 44, 102279. https://doi.org/10.1016/j.jcot.2023.102279](https://doi.org/10.1016/j.jcot.2023.102279)
2. [Finnoff, J. T., Hall, M. M., & Adams, E. (2011). American Medical Society for Sports Medicine (AMSSM) position statement: interventional musculoskeletal ultrasound in sports medicine. Clinical Journal of Sport Medicine, 21(5), 369–377. https://doi.org/10.1097/JSM.0b013e318230c164](https://doi.org/10.1097/JSM.0b013e318230c164)
3. [Gaspar, M. P., & Kane, P. M. (2013). The role of ultrasound-guided percutaneous needle tenotomy for the treatment of chronic tendinopathy. Techniques in Hand & Upper Extremity Surgery, 17(4), 209–213. https://doi.org/10.1097/BTH.0b013e3182a5c401](https://doi.org/10.1097/BTH.0b013e3182a5c401)
4. [Krey, D., Borchers, J., & McCamey, K. (2015). Tendon needling for treatment of tendinopathy: a systematic review. The Physician and Sportsmedicine, 43(1), 80–86. https://doi.org/10.1080/00913847.2015.996408](https://doi.org/10.1080/00913847.2015.996408)
5. [Mishra, A. K., & Pavelko, T. (2006). Treatment of chronic elbow tendinosis with buffered platelet-rich plasma. The American Journal of Sports Medicine, 34(11), 1774–1778. https://doi.org/10.1177/0363546506288850](https://doi.org/10.1177/0363546506288850)
6. Rabago, D., & Nourani, B. (2017). Prolotherapy for musculoskeletal pain. PM&R: The Journal of Injury, Function, and Rehabilitation, 9(9S), S220-S231. https://doi.org/10.1016/j.pmrj.2017.06.012](https://doi.org/10.1016/j.pmrj.2017.06.012)
7. [Scott, A., Squier, K., Alfredson, H., Bahr, R., Cook, J. L., Coombes, B., de Vos, R. J., Fu, S. N., Grimaldi, A., Lewis, J. S., Maffulli, N., Magnusson, S. P., OO’Neill S., Plinsinga, M. L., Rio, E., Gravare Silbernagel, K., van der Vlist, A., Vicenzino, B., Weir, A., & Zwerver, J. (2020). ICON 2019: International Scientific Tendinopathy Symposium Consensus: A systematic review, consensus statement, and clinical practice guidelines for diagnosis, management, and optimal return to sport for tendinopathy. British Journal of Sports Medicine, 54(18), 1085-1091. https://doi.org/10.1136/bjsports-2019-101286](https://doi.org/10.1136/bjsports-2019-101286)

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