2025 AMA Research Challenge – Member Premier Access

October 22, 2025

Virtual only, United States

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Optimizing the Value of Knee Injections: Comparative Analysis of Hyaluronic Acid and Corticosteroids

Background: In the U.S., approximately half the total population will develop knee osteoarthritis. Among them, nearly 50% of patients pursue intra-articular injections prior to total knee arthroplasty. Despite widespread use, the comparative value between corticosteroids (CS) and high molecular weight hyaluronic acid (HMW-HA) injections remains uncertain. This study evaluates each through cost analysis and prospective patient-reported outcomes. We hypothesize that CS injections will demonstrate superior value compared to HMW-HA.

Methods: Patients receiving CS or HMW-HA injections were recruited. Time-driven activity-based costing categorized total costs into direct variable labor (DVL), direct variable supply (DVS), direct fixed (DF), and indirect. Patient-reported outcomes were assessed using PROMIS Pain Interference (PROMIS-PI), PROMIS Physical Function (PROMIS-PF), and KOOS-JR at baseline, 3, and 6 months. Score changes from baseline to 3 months were multiplied by average duration of benefit to estimate quality-adjusted life years (QALYPI, QALYPF, QALYK). Total cost was divided by each QALY to determine Value. Lower cost per QALY indicates greater cost-effectiveness.

Results: Twelve patients received CS, 11 received HMW-HA. Average total cost was significantly lower for CS ($124.58) than HMW-HA ($604.19, p < 0.001). DVL costs were similar (CS: $13.41; HMW-HA: $13.06, p = 0.84). DVS costs differed significantly (CS: $10.61; HMW-HA: $367.14, p < 0.001). DF (CS: $33.52; HMW-HA: $74.66, p = 0.09) and indirect costs (CS: $67.04; HMW-HA: $149.32, p = 0.009) were higher for HMW-HA.

QALYs were not significantly different: QALYPI (CS: 0.60; HMW-HA: 0.59), QALYPF (CS: 1; HMW-HA: 0.36), QALYK (CS: 2.59; HMW-HA: 1.77).

Value measures favored CS: ValuePI: CS $206.21 vs. HMW-HA $1,022.47 ValuePF: CS $124.58 vs. HMW-HA $1,661.51 ValueKOOS: CS $48.09 vs. HMW-HA $348.46

Conclusion: CS injections were significantly less costly, mainly due to lower supply costs, and showed similar clinical benefit to HMW-HA at 3 months. CS demonstrated greater cost-effectiveness across all PROMs.

A limitation is short follow-up, though both injections typically provide around 3 months of benefit. Some evidence suggests effects may last longer. Continued follow-up may be valuable.

These findings highlight the importance of evaluating both outcomes and cost to determine treatment value.

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