High MW Series vs. Ultra-High MW Single Shot
Orthovisc and Synvisc-One are both premium HA products, but they take different approaches. Orthovisc uses non-cross-linked, high molecular weight HA delivered in a 3-4 injection series. Synvisc-One uses cross-linked, very high molecular weight HA in a single injection. Both are among the most commonly prescribed viscosupplements in the US.
Quick Comparison Table
| Feature | Orthovisc | Synvisc-One |
|---|---|---|
| Manufacturer | Anika Therapeutics | Sanofi |
| Injections needed | 3-4 weekly | 1 |
| Volume per injection | 2 mL | 6 mL |
| Total volume | 6-8 mL | 6 mL |
| Molecular weight | 1-2.9 million Da | 6 million Da |
| Cross-linked | No (native HA) | Yes (hylan polymer) |
| Source | Avian | Avian |
| Bird allergy safe | No | No |
| FDA approval | 2004 | 2009 |
| HCPCS Code | J7324 | J7325 |
| Duration | Up to 6 months | Up to 6 months |
| Self-pay cost | $600-$1,000 | $800-$1,200 |
What Is Orthovisc?
Orthovisc is manufactured by Anika Therapeutics, the same company that makes Monovisc (a single-injection product). It contains non-cross-linked, ultra-pure sodium hyaluronate with a molecular weight of 1-2.9 million Daltons, which falls in the high range among HA products.
What Sets Orthovisc Apart
What Is Synvisc-One?
Synvisc-One is manufactured by Sanofi and contains hylan G-F 20, a cross-linked hyaluronic acid with the highest molecular weight of any HA product on the market at approximately 6 million Daltons. It was the first single-injection HA product to receive FDA approval.
What Sets Synvisc-One Apart
Molecular Weight: Does Higher Mean Better?
Orthovisc and Synvisc-One have very different molecular weights, which raises a common patient question.
Orthovisc: 1-2.9 million Daltons (natural, non-cross-linked) Synvisc-One: 6 million Daltons (achieved through cross-linking)
Does the difference matter clinically?
Research has not shown that higher molecular weight consistently produces better outcomes. Some studies suggest that moderate-to-high MW products work just as well as ultra-high MW products. The relationship between molecular weight and clinical effectiveness is more nuanced than “higher = better.”
What matters more may be:
- Whether your body responds well to the specific formulation
- Whether the injection is placed accurately in the joint
- Your arthritis severity and activity level
Cross-Linked vs. Non-Cross-Linked: The Key Formulation Difference
| Property | Orthovisc (Non-CL) | Synvisc-One (Cross-Linked) |
|---|---|---|
| How MW is achieved | Purification of natural HA | Chemical cross-linking |
| Joint residence time | Moderate | Longer (theoretically) |
| Pseudoseptic reaction risk | Lower | Slightly higher |
| Injection difficulty | Easier (thinner) | Harder (very thick gel) |
| Matches natural HA | Yes (native structure) | No (modified polymer) |
What This Means for You
If you are concerned about inflammatory reactions, Orthovisc’s non-cross-linked formulation may be safer. The rate of pseudoseptic reactions (painful swelling that mimics infection) is lower with non-cross-linked products across the literature.
If you want maximum molecular weight in a single injection, Synvisc-One is the only option that combines ultra-high MW with one-visit convenience.
Insurance and Cost
| Factor | Orthovisc | Synvisc-One |
|---|---|---|
| Drug cost (self-pay) | $600-$1,000 | $800-$1,200 |
| Office visits | 3-4 | 1 |
| Medicare copays | $90-$200 total | $50-$150 |
| Total with Medicare | $150-$350 | $100-$250 |
Note: While Orthovisc has a lower drug cost, the additional office visit copays can make the total cost similar to or even higher than Synvisc-One.
Making Your Decision
Choose Orthovisc if:
- You prefer non-cross-linked, natural HA structure
- You are concerned about inflammatory reactions from cross-linked products
- You like Anika Therapeutics products (same maker as Monovisc)
- Your provider recommends gradual delivery over multiple visits
- Cost of the drug (not visits) is your primary concern
Choose Synvisc-One if:
- You want treatment done in one visit
- You prefer the highest molecular weight available
- You want the most established single-injection product
- Minimizing total appointments matters to you
- Your insurance covers both equally
Frequently Asked Questions
Can I switch from Orthovisc to Synvisc-One?
Yes. If you have been receiving Orthovisc series and want to try single-injection convenience, Synvisc-One is a safe switch. Some patients alternate between products to find what works best.
Does Orthovisc work as well as Synvisc-One?
Clinical studies show comparable outcomes for both products in terms of pain relief and function improvement. The higher molecular weight of Synvisc-One has not been proven to produce better clinical results.
Which is better for repeat treatments?
Both can be repeated every 6 months. Some physicians prefer non-cross-linked products like Orthovisc for repeated long-term use because of the lower reaction risk profile.
My doctor uses Monovisc. Is Orthovisc similar?
Yes, both are made by Anika Therapeutics using the same HA source and purification process. Orthovisc is the multi-injection version; Monovisc is the single-injection version. If you respond well to one, you will likely respond well to the other.
The Bottom Line
Orthovisc and Synvisc-One are both premium HA products with strong clinical evidence. The choice comes down to:
- Formulation philosophy: Natural HA (Orthovisc) vs. cross-linked polymer (Synvisc-One)
- Convenience: 3-4 visits (Orthovisc) vs. 1 visit (Synvisc-One)
- Molecular weight preference: High (Orthovisc) vs. ultra-high (Synvisc-One)
- Reaction risk tolerance: Lower risk (Orthovisc) vs. slightly higher risk (Synvisc-One)
Both provide up to 6 months of relief and are covered by Medicare.
Find HA Injection Providers
Connect with experienced providers offering Orthovisc, Synvisc-One, and other viscosupplementation products.
Your information is secure. See our Privacy Policy and Terms of Service.
Thank You!
We've received your request. A provider specialist will contact you within 1-2 business days to help you find the right care.
What happens next?
- 1 We'll verify your insurance coverage
- 2 Match you with quality providers in your area
- 3 Contact you to discuss your options
Questions? Browse our guides:
How to Choose a ProviderRelated Comparisons
HA Treatment Comparisons
Stay informed about viscosupplementation options for knee osteoarthritis.
Join 10,000+ readers. No spam.