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# Hyaluronic Acid ## Overview Hyaluronic acid (HA) is a naturally occurring glycosaminoglycan that is a major component of synovial fluid and cartilage. It acts as a lubricant and shock absorber in joints. In medical applications, it is often used as a viscoelastic agent. ## Primary Indications * **Intra-articular injection:** Osteoarthritis of the knee (symptomatic relief). * **Ophthalmic surgery:** Ophthalmic viscoelastic device (OVD) to maintain anterior chamber space during cataract surgery and other ocular procedures. * **Wound healing:** Some topical formulations are used for wound healing. ## Adult Dosing * **Osteoarthritis of the Knee:** * Commonly administered as a single intra-articular injection of 2 mL (20 mg) or 3 mL (30 mg) into the affected knee joint. * Some formulations may allow for a series of 3 or 5 weekly injections. Specific dosing and number of injections depend on the product and local protocol. * Maximum frequency is typically no more than once every 6 months per joint. * **Ophthalmic Surgery:** * Dosage is dependent on the specific surgical procedure and the product used. Administered intraocularly by the surgeon. ## Pediatric Dosing * Intra-articular hyaluronic acid for osteoarthritis is **not** typically recommended or studied in pediatric patients. * Ophthalmic use in pediatrics would be determined by the ophthalmologist based on the specific procedure. ## Dose Adjustments * No dose adjustments are typically required based on renal or hepatic impairment for intra-articular or intraocular administration, as systemic absorption is minimal. ## Contraindications * Active infection in or around the knee joint (for intra-articular injections). * Known hypersensitivity to hyaluronic acid or any component of the formulation. * Skin or joint infections at the injection site. ## Adverse Effects * **Intra-articular injection:** * Pain, swelling, stiffness, or redness at the injection site. * Arthralgia. * Joint effusion. * Transient inflammatory reactions. * Rarely, anaphylactic reactions. * **Ophthalmic surgery:** * Increased intraocular pressure (IOP). * Inflammation. * Corneal edema. * Retinal detachment (rare). ## Key Drug Interactions * **Intra-articular:** Concurrent use with anesthetics in the same syringe may lead to rapid dispersion of HA, potentially reducing its efficacy. Avoid mixing. * **Ophthalmic:** Interaction potential is related to other topical ophthalmic medications used concurrently. ## Monitoring * **Intra-articular injection:** * Monitor for signs and symptoms of infection at the injection site. * Assess for joint pain, swelling, and functional improvement. * **Ophthalmic surgery:** * Postoperative IOP monitoring. * Evaluation for signs of inflammation or other complications. ## Clinical Pearls * Hyaluronic acid injections provide symptomatic relief for osteoarthritis of the knee and are not a cure. Effectiveness can vary between individuals. * Proper sterile technique is crucial for intra-articular and intraocular injections to prevent infection. * Patients should be advised to avoid strenuous activity for 24-48 hours after intra-articular injection. *** **Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant clinical guidelines before making any treatment decisions. Dosing and indications can vary by specific product and local protocols.