Hyaluronic Injection for Knees– Intra-Articular Therapy for Osteoarthritis
INTRODUCTION
Osteoarthritis (OA) is a progressive joint disorder resulting in joint pain, stiffness, and reduced mobility due to cartilage and synovial fluid degradation. Viscosupplementation—injecting hyaluronic acid-based solutions—is a validated approach to restore lubrication, shock absorption, and joint function.
Hyaluronic Injection for Knees are Swiss‑engineered intra-articular gels combining high-molecular-weight hyaluronic acid with sorbitol. Designed for fast, targeted symptom relief and long-lasting performance, they’re approved for treating knee and hip OA.
What Causes Osteoarthritis (OA)?
Osteoarthritis is a complex, multifactorial degenerative joint disease that affects the entire joint structure—including articular cartilage, subchondral bone, synovial fluid, and periarticular tissues. While it can affect any joint, it is most commonly found in the knees, hips, hands, and spine.
1. Cartilage Breakdown
What it is:
Articular cartilage is a smooth, rubber-like tissue that lines the ends of bones in a joint. It reduces friction and acts as a cushion during movement.
Why it happens:
- Mechanical wear and tear over time depletes the extracellular matrix (ECM), especially the loss of proteoglycans and type II collagen, which are essential for elasticity and tensile strength.
- Inflammatory cytokines (e.g., IL-1β, TNF-α) are released in response to microtrauma or age-related degeneration. These cytokines activate enzymes like matrix metalloproteinases (MMPs), which degrade the cartilage matrix.
- Chondrocyte apoptosis (cell death) increases, while regenerative activity diminishes, making it harder for cartilage to repair itself.
- Result:
The cartilage thins, cracks, and eventually erodes, exposing the underlying bone. This leads to increased bone-on-bone friction, causing pain, inflammation, and reduced joint mobility.
2. Synovial Fluid Deterioration
What it is:
Synovial fluid is a viscous substance within the joint capsule that lubricates and nourishes the cartilage. It contains hyaluronic acid (HA), which gives it its shock-absorbing and lubricating properties.
Why it happens:
- With age and inflammation, the concentration and molecular weight of HA in synovial fluid decreases.
- Oxidative stress (from reactive oxygen species) accelerates HA degradation.
- Enzymatic breakdown by hyaluronidases and inflammation-related enzymes further degrades HA.
Result:
The joint loses its natural “cushioning,” resulting in less shock absorption and more mechanical stress on cartilage and bone, worsening degeneration and increasing joint stiffness and discomfort.
3. Subchondral Bone Remodeling and Sclerosis
What it is:
The bone beneath the cartilage (subchondral bone) thickens and undergoes abnormal remodeling in OA.
Why it happens:
- Loss of cartilage exposes bone to excessive stress.
- Osteoblast activity increases, forming sclerotic (hardened) bone and osteophytes (bone spurs).
- This disrupts normal joint architecture and increases pain.
What are Knee Fillers?
Formulation & Device
- 2 % high-molecular-weight sodium hyaluronate (≥2 MDa) derived through bio-fermentation.
- 4 % sorbitol, a potent antioxidant that stabilizes HA, preserving rheological properties and reducing oxidative degradation.
- Offered in 2 ml and 4 ml prefilled syringes.
Visco-Antalgic Concept
This unique pairing offers:
1. Mechanical relief—HA replenishes synovial fluid for lubrication and shock absorption.
2. Biochemical protection—sorbitol scavenges free radicals, reducing inflammation and enzyme-mediated HA degradation.
How It Works
Injection Protocol
- Administered by a qualified healthcare professional, typically under imaging guidance (knee/hip).
- Can be used as single 4 ml injection (Monoshot) or three weekly 2 ml injections (Multishot).
Rheological Benefits
- Exhibits visco-elastic behavior comparable to healthy synovial fluid (crossover frequency ≈ 0.4 Hz).
- After an oxidative challenge, it resists degradation better than alternatives, retaining fluid properties
Clinical Evidence & Efficacy
Rapid & Durable Relief
- Immediate pain relief observed within one week post-injection, intensifying through 24 weeks.
- Supports functional gains and mobility improvements over months.
Study | Finding |
Head-to-head RCT | Knee Fillers shown non‑inferior at 6 months (WOMAC pain; 79 % vs 77 % responders) |
Post-arthroscopy RCT | 2 % HA+4 % sorbitol improved pain/function in early post-op period |
Prospective open-label (13 weeks) | 50 % pain reduction after first injection; 70% responders; maintained relief |
Observational Japanese study | VAS pain reduced from 5.3 → 1.2; WOMAC improved; 92% satisfaction at 12 weeks |
Who Is Suitable?
Ideal Patients
-Individuals with knee or hip OA who have failed or cannot tolerate NSAIDs, analgesics, or corticosteroids.
-Prefer to defer or avoid surgical intervention.
-Prefer a single or short-course non-pharmacological therapy.
Contraindications
-Local joint or systemic infection.
-Known sensitivity to HA or sorbitol.
-Severe coagulopathy or immunodeficiency—assessed case-by-case.
What to Expect
- Consultation & imaging confirmation of OA grade.
- Injection session (2 ml ×3 or 4 ml single dose).
- Post-injection care: mild rest, avoid heavy exertion for 48–72 hours.
- Symptom improvement within 3–7 days, with peak benefit around 4–12 weeks and retention up to 6 months or more.
Side effects: Typically mild—temporary injection site soreness, swelling, or warmth.
Benefits
- Fast pain relief (“fast-acting”; half the pain reduction after one injection)
- Long-lasting effect (≥6 months symptom relief)
- Joint function restoration—improved mobility and quality of life
Excellent safety profile with minimal adverse events
Why Choose Us for Hyaluronic Injection for Knees Treatment?
- Expert injectors: orthopedic specialists trained in image-guided viscosupplementation.
- Individualised protocols: choosing mono- or multi-injections based on clinical need.
- Evidence-based care: guided by high-quality clinical and mechanistic data.
Patient-centred approach: post-treatment support for activity resumption and follow-up assessments.
FAQ
Hyaluronic Injection for Knees refer to injections of hyaluronic acid (HA) into the knee joint, designed to restore the viscoelastic properties of synovial fluid. In a healthy knee, HA provides lubrication, shock absorption, and joint cushioning. In osteoarthritis, HA levels and quality decline, leading to increased friction, inflammation, and cartilage wear. Injecting HA directly into the joint helps reduce pain, improve mobility, and support smoother joint motion by replenishing the natural joint fluid.
Not all are created equal. They differ in:
- Molecular weight: Low, medium, or high; higher weights may last longer but can also cause more stiffness.
- Cross-linking: Some formulations are cross-linked for durability, while others are non-crosslinked
- Additives: Some modern formulations include antioxidants like sorbitol or mannitol to protect the HA from degradation.
The choice of product depends on your stage of osteoarthritis, age, activity level, and previous response to treatment.
The effects can vary, but symptom relief typically begins within 1–2 weeks and may last anywhere from 3 to 12 months, depending on the formulation and patient factors. Some products are designed as a single-shot treatment while others require 3–5 weekly injections. Repeat treatments can be safely administered every 6–12 months, but should be guided by symptom recurrence and joint health monitoring.