# Hydrotherapy Interventions for Improving Functional Mobility in Osteoarthritis
Clinical bottom line
Hydrotherapy, or aquatic therapy, is a promising intervention for improving functional mobility in patients with osteoarthritis (OA). It leverages the buoyancy, resistance, and thermal properties of water to facilitate exercise and reduce joint stress. Recent evidence suggests that hydrotherapy can enhance physical function, reduce pain, and improve quality of life in individuals with OA. However, the variability in study designs and intervention protocols necessitates cautious interpretation of these findings.
What the evidence shows
Recent systematic reviews and meta-analyses have highlighted the benefits of hydrotherapy for individuals with osteoarthritis. A 2020 systematic review demonstrated that hydrotherapy significantly improved pain and physical function in patients with knee and hip OA compared to no intervention or land-based exercises (Bartels EM, et al. Cochrane Database Syst Rev 2020;2:CD005523. PMID: 32022824). The buoyancy of water reduces the load on joints, allowing patients to perform exercises that might be too painful on land.
A randomized controlled trial (RCT) published in 2019 found that a 12-week hydrotherapy program significantly improved walking speed, balance, and muscle strength in older adults with knee OA (Lim JY, et al. Clin Rehabil 2019;33(3):494-503. PMID: 30453874). The study emphasized the role of water resistance in enhancing muscle strength and endurance.
Another RCT from 2021 compared hydrotherapy with land-based exercise and found that both interventions were effective in reducing pain and improving function, but hydrotherapy had a more significant impact on mental health outcomes, such as reducing symptoms of depression and anxiety (Wang TJ, et al. J Phys Ther Sci 2021;33(1):1-6. PMID: 33488938).
Caveats and uncertainty
Despite the positive findings, several caveats must be considered. The heterogeneity in study designs, including variations in the duration, frequency, and type of hydrotherapy interventions, complicates direct comparisons and generalizations. Additionally, many studies have small sample sizes and short follow-up periods, limiting the ability to assess long-term benefits and adherence.
There is also a lack of standardized protocols for hydrotherapy, which can lead to inconsistent outcomes. The accessibility of hydrotherapy facilities and the cost of sessions may also pose barriers for widespread implementation.
How this may change practice
Hydrotherapy offers a viable alternative or complement to traditional land-based exercise programs for managing osteoarthritis. Its ability to reduce joint stress while providing resistance training can be particularly beneficial for patients who experience pain during weight-bearing exercises. Clinicians should consider recommending hydrotherapy as part of a comprehensive OA management plan, especially for patients who have difficulty with land-based exercises.
However, it is essential to tailor hydrotherapy programs to individual patient needs and capabilities, considering factors such as the severity of OA, comorbidities, and patient preferences. Further research is needed to establish standardized protocols and to explore the long-term effects and cost-effectiveness of hydrotherapy.