Assessing joint damage in juvenile idiopathic arthritis: Guide for prescribing physical exercise with the juvenile arthritis damage index

Abstract

Juvenile idiopathic arthritis (JIA) is a chronic disease capable of causing significant structural and functional damage. The study by Kolkhidova et al demonstrated that baseline structural damage, assessed by the juvenile arthritis damage index (JADI), is a strong predictor of poor response to biological treatment. While promising, these findings require validation in larger and more diverse cohorts to enhance external applicability. In addition to reinforcing early pharmacological decision-making, these results highlight the importance of integrating a precise damage assessment into rehabilitation planning, as it can support individualized exercise prescriptions and targeted physiotherapy. JADI can identify patients with established lesions, such as contractures, who may benefit from personalized physical exercise and physiotherapy programs. A more explicit emphasis on how damage assessment guides functional planning can improve the clinical applicability of these findings. Early integration of rehabilitation alongside medication therapy can help not only restore function but also prevent further deterioration, improve adherence, and foster long-term self-management. Incorporating JADI assessment into clinical practice can optimize exercise prescription, improve mobility and strength, and ultimately enhance quality of life in patients with JIA.

Key Words: Physical rehabilitation; Contractures; Prognostic assessment; Pediatric rheumatology; Functional outcomes

Core Tip: Juvenile idiopathic arthritis (JIA) can lead to irreversible structural and functional damage. The juvenile arthritis damage index (JADI) emerges as a valuable tool for assessing long-term joint involvement and guiding therapeutic strategies. In addition to predicting pharmacological response, JADI offers specific advantages over disease activity scores-such as juvenile arthritis disease activity score-because it reflects irreversible damage rather than active inflammation, making it particularly relevant for long-term rehabilitation planning. Beyond predicting pharmacological response, JADI enables the identification of patients with established lesions who require tailored rehabilitation. Early integration of individualized physical exercise and physiotherapy with medical treatment may restore function, prevent further deterioration, and enhance adherence. Incorporating JADI into clinical practice optimizes exercise prescription, mobility, and quality of life in patients with JIA.

TO THE EDITOR

The article by Kolkhidova et al[1], which addresses the prognostic value of the juvenile arthritis damage index (JADI) in the response to biological treatment in patients with juvenile idiopathic arthritis (JIA), is a notable contribution to the literature. The study demonstrates that baseline structural damage, assessed by JADI, is a significant predictor of poor response to biologic disease-modifying anti-rheumatic drugs, with patients without initial damage (JADI negative) showing better results. While this conclusion is supported by consistent data, a more in-depth discussion of potential methodological limitations-such as sample size, variability in disease subtypes, duration of follow-up, and possible influence of concomitant therapies-would further contextualize the findings. Additionally, multicenter validation in more diverse populations is warranted to strengthen external validity. This conclusion is crucial for therapeutic decision-making and underscores the importance of a complete patient assessment, including articular and extra-articular damage.

The clinical relevance of this study extends beyond the choice of medication, directly impacting the prescription of physical exercises and rehabilitation. The JADI-A, which correlates with limited range of motion, dysfunction, and radiographic damage, is a validated tool for assessing long-term damage[2]. The findings by Kolkhidova et al[1] that specific lesions such as wrist and elbow contractures are associated with an unsatisfactory therapeutic response provide strong evidence for early and targeted non-pharmacological intervention[1]. This reinforces the need for integrating functional assessment tools like JADI-A into standard rheumatology practice, ensuring that therapeutic strategies address both pharmacological control of inflammation and prevention of irreversible biomechanical changes. These observations also highlight the preventive potential of early rehabilitation to avoid irreversible contractures and functional decline.

EXERCISE

Physical exercise is recognized as a fundamental part of JIA management, helping to maintain muscle strength, joint mobility, and prevent the “deconditioning spiral” commonly seen in these patients[3]. However, statements regarding exercise during acute inflammation-such as the indication of range of motion (ROM) exercises even during flares-should be more explicitly linked to guideline-level recommendations or landmark studies[4]. Joint contractures, in particular, can be prevented and improved with range-of-motion exercises, even during periods of acute inflammation, and a physical therapist can help individualize the exercise program[5]. Clarifying which exercise modalities are recommended during active disease-such as ROM exercises, isometric strengthening, and aquatic therapy-and supporting these recommendations with high-quality, guideline-based evidence would further strengthen this section[4,6].

Evidence suggests that rehabilitation should be initiated in parallel with drug therapy, using periodized and progressive approaches that respect disease activity while promoting gradual functional gains. For example, incorporating gentle stretching routines, aquatic therapy, and progressive strengthening tailored to joint tolerance can provide measurable functional benefits. A more assertive intervention, directed toward the patient’s needs and optimal conditions, can also contribute to adherence to physical exercise practice[4]. Although reference is derived from research in the general population[7], its inclusion is justified because the mechanisms underlying exercise adherence-such as motivation, perceived competence, and structured guidance-are shared across chronic conditions. These behavioral determinants have also been documented as relevant in pediatric rheumatology and, by extension, in JIA populations[4,6]. However, if a JIA-specific adherence study is preferred, this reference may be replaced with evidence directly assessing adherence behavior in children with JIA, ensuring closer alignment with the clinical context.

The detection of damage by JADI should, therefore, serve as a trigger for implementing a personalized and more aggressive rehabilitation and exercise plan, complementing medication therapy. Studies show that structured exercise programs, including aquatic exercises, stretching, and strengthening, can improve physical fitness, function, and quality of life in children with JIA[8]. Long-term follow-up of such interventions indicates sustained benefits in joint mobility, pain reduction, and psychological well-being. Emphasizing that these benefits align with damage-oriented planning reinforces the novelty of linking JADI findings to rehabilitation decisions[6]. Combining the JADI damage assessment with medication therapy and an adapted exercise program can maximize clinical and functional outcomes, reducing long-term damage progression and disability[9].

CONCLUSION

The article by Kolkhidova et al[1] highlights the importance of a comprehensive assessment in JIA. By demonstrating that baseline structural damage, measured by JADI, influences the response to biological treatment, the authors reinforce the vital role of damage assessment as a practical guide for therapeutic decision-making. Clarifying the distinction between damage (JADI) and disease activity (e.g., juvenile arthritis disease activity score) further strengthens the argument for why JADI holds unique relevance for long-term functional planning. However, these findings would benefit from further validation in larger and more diverse cohorts, ensuring applicability across different JIA subtypes and healthcare settings.

This extends to the prescription of physical exercises and physiotherapy, where the identification of specific lesions such as contractures can guide personalized rehabilitation interventions. Early integration of rehabilitation-implemented alongside pharmacological treatment-may not only address existing functional limitations but also prevent irreversible damage, improve adherence to therapy, and foster long-term self-management skills in pediatric patients. Therefore, a multimodal approach that integrates the precise assessment of damage with JADI, medication therapy, and an adapted exercise plan from the earliest stages of care is essential to optimize treatment, preserve joint function, and ultimately ensure the best possible quality of life for patients with JIA.