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Psoriatic Arthritis

Psoriatic arthritis of the hand for the surgeon (corpus-synthesised).

Overview

Psoriatic arthritis is a distinct, clinically heterogeneous inflammatory arthropathy characterized by skin changes and joint involvement, often presenting as an asymmetrical polyarthritis [1, 3, 4]. It is a definite entity with roentgenographic findings different from rheumatoid arthritis, particularly affecting distal joints [1, 2]. The disease typically follows a moderate course, though up to 47% of cases progress to destructive arthritis [6]. Molecular and cellular mechanisms underlying bone remodeling in spondyloarthritis emphasize both shared pathways and disease-specific features to support the development of more precise therapeutic approaches tailored to axSpA and PsA [11].

Management relies on the 2018 ACR/NPF PsA guideline as a tool for selecting appropriate therapy in common clinical scenarios [5]. Both manifestations of psoriasis are associated with risks of complications following total hip arthroplasty [7]. Reducing diagnostic delay, improving knowledge and awareness among patients and health professionals, and increasing specialist podiatry service provision may be required to meet the foot health needs of this population [8]. The prevalence of physician-diagnosed psoriasis and PsA confirms other population-based studies, even after adjustment for disease misclassification [9].

Background & Causes

Psoriatic arthritis (PsA) is a distinct clinical entity characterized by roentgenographic and clinical findings that differentiate it from rheumatoid arthritis, particularly regarding distal joint involvement [1]. It is a definite disease spectrum comprising skin changes and joint involvement, often manifesting as an asymmetrical polyarthritis [2, 4]. As a clinically heterogeneous inflammatory arthritis, PsA is common among patients with psoriasis and typically follows a moderate course, though up to 47% of cases progress to destructive arthritis [3, 6].

The etiology of PsA involves specific genetic and biomarker associations. The T allele of VEGF in +936 may act as a protective allele in disease development [25], while MMP-3 and MIA serve as soluble biomarkers linked to inflammation, joint remodelling, and destruction [23].

Clinical presentation extends beyond joint pathology to significant systemic burden. Both psoriasis manifestations carry risks of complications following total hip arthroplasty [7]. Patients with PsA exhibit significantly higher severity of fatigue compared to those with psoriasis alone [10]. Fatigue levels are high in PsA, where scores > 5/10 are associated with disease-related factors and patient-related variables, indicating a multifactorial etiology [26]. Population-based studies confirm the prevalence of physician-diagnosed psoriasis and PsA, even after adjusting for disease misclassification [9].

Symptoms & Presentation

Psoriatic arthritis (PsA) is a distinct clinical entity characterized by roentgenographic and clinical findings that differentiate it from rheumatoid arthritis, particularly regarding distal joint involvement [1]. It presents as a clinically heterogeneous inflammatory arthritis common among patients with psoriasis [3], manifesting as a disease spectrum of skin changes and joint involvement, often an asymmetrical polyarthritis [4]. The condition is a chronic inflammatory arthropathy typically following a moderate course, though up to 47% of cases progress to destructive arthritis [6].

Clinical Severity: Fatigue severity is significantly higher in patients with PsA compared to those with psoriasis alone [10]. One fifth of patients experience deterioration of physical function over time, with joint damage and baseline physical function identified as important factors associated with poor physical function [12]. Inflammatory back pain (IBP) is substantial across groups, with health reports in non-ankylosing spondylitis (non-AS) groups being similar or worse than in the AS group, supporting the severity of IBP in these non-AS spondyloarthritis groups [20].

Diagnostic Assessment: The addition of ultrasound to complement clinical assessment of swollen joints may facilitate better selection of active patients for inclusion in PsA clinical trials, thereby limiting the variability of therapeutic response usually observed [19].

Management

Psoriatic arthritis (PsA) is a distinct, clinically heterogeneous inflammatory arthropathy characterized by skin changes and joint involvement, often presenting as an asymmetrical polyarthritis that differs roentgenographically from rheumatoid arthritis, particularly in distal joint distribution [1, 3, 4]. It is a definite entity requiring recognition and treatment tailored to its special needs [2]. The disease typically follows a moderate course, yet up to 47% of cases progress to destructive arthritis [6]. Patients frequently experience severe fatigue compared to those with psoriasis alone [10], and one fifth may suffer deterioration in physical function over time, driven by joint damage and baseline status [12].

Therapeutic Strategy: Early and intensive treatment improves disease activity and reduces radiological joint damage [16]. Very early initiation of golimumab reduces disease activity compared to conventional therapy [13]. Biologic agents are cost-effective for active PsA compared to traditional management, with etanercept identified as the most cost-effective option [14, 15]. The 2018 ACR/NPF PsA guideline serves as a tool for selecting appropriate therapy in common clinical scenarios [5].

Monitoring and Assessment: The SOLAR score is a suitable instrument for the qualitative and quantitative evaluation of large joint involvement in PsA and AS, facilitating treatment monitoring [18]. In patients with low to moderate disease activity, high-intensity interval training does not objectively increase inflammation as measured by ultrasound or MRI [17].

Complications and Systemic Needs: Both psoriasis manifestations carry risks of complications following total hip arthroplasty [7]. Meeting the foot health needs of PsA patients may require reducing diagnostic delay, improving disease awareness among patients and professionals, and increasing specialist podiatry service provision [8].

Key Considerations

Psoriatic arthritis (PsA) is a distinct, clinically heterogeneous inflammatory arthropathy characterized by skin changes and joint involvement, often presenting as an asymmetrical polyarthritis [1][3][4]. It differs from rheumatoid arthritis by its characteristic clinical and roentgenographic findings, particularly affecting distal joints [1]. As a definite entity, it requires recognition and treatment according to its special needs [2]. The disease typically follows a moderate course, though up to 47% of cases progress to destructive arthritis [6].

Disease Burden and Prognosis: Severity of fatigue is significantly higher in patients with PsA compared to those with psoriasis alone [10]. One fifth of patients experience deterioration of physical function over time, with joint damage and baseline physical function serving as important factors associated with poor outcomes [12]. Furthermore, disease activity is an independent predictor of the 10-year probability for a major osteoporotic fracture in the PsA cohort [21].

Diagnostic and Therapeutic Framework: The 2018 ACR/NPF PsA guideline serves as a tool for healthcare providers and patients in selecting appropriate therapy for common clinical scenarios [5]. Reducing diagnostic delay, improving disease awareness among patients and professionals, and increasing specialist podiatry service provision are required to meet foot health needs [8]. While anti-TNF therapy yields good clinical responses for arthritis, skin, and nail disease, persistent subclinical inflammation (osteitis, synovitis, and enthesopathy) is often observed at six months [22]. Although the majority of patients receive only one line of anti-TNFα therapy, a subset switches to multiple lines during a 3-year follow-up [24].

Prevalence and Complications: The prevalence of physician-diagnosed psoriasis and PsA aligns with other population-based studies, even after adjusting for disease misclassification [9]. Both manifestations of psoriasis are associated with risks of complications following total hip arthroplasty [7]. Assessment of volumetric and areal bone mineral density (BMD), complemented by disease activity, assures better efficacy in identifying patients with low BMD within the studied cohort [21].

Key Evidence

  • [L5] Psoriatic arthritis is a definite entity that should be recognized and treated according to its special needs. (10.1016/s0749-0712(21)00346-2)
  • [L4] Psoriatic arthritis (PsA) is a clinically heterogeneous inflammatory arthritis that is common among patients with psoriasis. (10.1016/j.rdc.2015.07.001)
  • [L5] Psoriatic arthritis is a disease spectrum consisting of skin changes and joint involvement, the latter often being an asymmetrical polyarthritis. (10.1016/s0749-0712(21)00801-5)
  • [L1] The 2018 ACR/NPF PsA guideline serves as a tool for health care providers and patients in the selection of appropriate therapy in common clinical scenarios. (10.1002/art.40726)
  • [L5] Psoriatic arthritis is a chronic inflammatory arthropathy that typically follows a moderate course, though up to 47% of cases develop into destructive arthritis. (10.5435/jaaos-20-01-028)
  • [L3] This study showed both manifestations of psoriasis are associated with risks of complications following THA. (10.1016/j.arth.2026.03.054)
  • [L4] To meet the foot health needs of people with psoriatic arthritis, reducing diagnostic delay, improving knowledge and awareness about the disease among people with psoriatic arthritis and health professionals, and increasing specialist podiatry service provision may be required. (10.1186/s12891-019-2572-6)
  • [L3] The prevalence of physician-diagnosed psoriasis and PsA confirms other population-based studies, also after adjustment due to misclassification of disease. (10.1371/journal.pone.0098024)
  • [L4] Severity of fatigue was significantly higher in patients with PsA as compared to patients with psoriasis. (10.5114/ada.2019.83629)
  • [L4] This review explores the intricate molecular and cellular mechanisms underlying bone remodeling in spondyloarthritis, emphasizing both shared pathways and disease-specific features to support the development of more precise and effective therapeutic approaches tailored to axSpA and PsA. (10.3389/fimmu.2025.1599995)
  • [L3] One fifth of patients experienced deterioration of physical function over time, with joint damage and baseline physical function being important factors associated with poor physical function. (10.1186/1471-2474-15-284)
  • [L2] The study protocol postulates that very early treatment with golimumab reduces disease activity in PsA compared to conventional therapy. (10.1186/s12891-017-1659-1)
  • [L1] Biologic agents offer a good value for money and are cost-effective for treating patients with active Psoriatic Arthritis compared to traditional treatments, with etanercept identified as the most cost-effective option. (10.1186/1471-2474-15-25)
  • [L1] The economic analysis agrees with the conclusions from the previous models, in that biologics are shown to be cost-effective for treating patients with active PsA compared with the conventional management strategy. (10.1186/1471-2474-15-26)
  • [L1] The TICOPA trial will provide direct evidence as to whether the use of early and intensive treatment in PsA in routine clinical care leads to an improvement in patients' disease activity and a reduction in radiological joint damage. (10.1186/1471-2474-14-101)
  • [L1] In PsA patients with a low to moderate disease activity, there was no clear evidence of objectively measured increased inflammation after HIIT, as evaluated by US and MRI. (10.1186/s12891-023-06871-3)
  • [L4] The SOLAR score is a very suitable instrument for the qualitative and quantitative evaluation of large joint involvement in PsA and AS patients and allows for treatment monitoring. (10.1186/1471-2474-14-358)
  • [L2] The addition of ultrasound to complement clinical assessment of swollen joints may help in better selecting active patients for inclusion in PsA clinical trials, thereby limiting the variability of the therapeutic response usually observed. (10.1186/s12891-025-09434-w)
  • [L3] The proportion of patients with current inflammatory back pain was substantial in all three groups and health reports in the non-AS groups were similar or worse compared to the AS group supporting the severity of IBP in these non-AS SpA groups. (10.1186/s12891-016-0960-8)
  • [L3] In the studied PsA cohort, disease activity was an independent predictor of 10-year probability for a major osteoporotic fracture, and complemented assessment of volumetric and areal BMD assured better efficacy at identifying those with low bone mineral density. (10.1186/s12891-021-03952-z)
  • [L4] A good clinical response for arthritis, skin and nail disease was seen with anti-TNF therapy, but the study shows persistent ongoing subclinical inflammation (osteitis, synovitis and enthesopathy) at six months. (10.1186/1471-2474-14-s1-a7)
  • [L1] MMP-3 and MIA could serve as soluble biomarkers associated with inflammation as well as joint remodelling and destruction and may, together with clinical evaluation and in combination with other biomarkers, assist in distinguishing between effective and ineffective therapy in small, proof-of-principle studies of short duration in PsA. (10.1371/journal.pone.0012556)
  • [L3] While the majority of patients received only one line of anti-TNFα therapy, a subset of patients switched to multiple lines of therapy during the 3-year follow-up period. (10.1186/s12891-016-1102-z)
  • [L3] The T allele of VEGF in +936 may act as a protective allele in the development of PsA. (10.1186/1471-2474-8-1)
  • [L4] Fatigue levels were high in these patients and fatigue > 5/10 was mainly associated with disease-related factors but also patient-related variables, indicating that the etiology of fatigue in PsA is multifactorial. (10.1016/j.jbspin.2015.07.017)

References

[1] PSORIATIC ARTHRITIS: Observations on the Clinical, Roentgenographic, and Pathological Chances.. The Journal of Bone and Joint Surgery. American Volume. 1952.

[2] SURGERY OF PSORIATIC ARTHRITIS OF THE HAND. Hand Clinics. 1996. DOI: 10.1016/s0749-0712(21)00346-2

[3] The Epidemiology of Psoriatic Arthritis. Rheumatic Disease Clinics of North America. 2015. DOI: 10.1016/j.rdc.2015.07.001

[4] Psoriatic Arthritis in the Hand. Hand Clinics. 1989. DOI: 10.1016/s0749-0712(21)00801-5

[5] 2018 American College of Rheumatology/National Psoriasis Foundation Guideline for the Treatment of Psoriatic Arthritis. Arthritis & Rheumatology. 2018. DOI: 10.1002/art.40726

[6] Psoriatic Arthritis. American Academy of Orthopaedic Surgeon. 2012. DOI: 10.5435/jaaos-20-01-028

[7] Outcomes Following Total Hip Arthroplasty in Patients with Cutaneous Psoriasis and Psoriatic Arthritis. The Journal of Arthroplasty. 2026. DOI: 10.1016/j.arth.2026.03.054

[8] Health professional views on the assessment and management of foot problems in people with psoriatic arthritis in Australia and New Zealand: a qualitative investigation. BMC Musculoskeletal Disorders. 2019. DOI: 10.1186/s12891-019-2572-6

[9] Validity of Diagnostic Codes and Prevalence of Physician-Diagnosed Psoriasis and Psoriatic Arthritis in Southern Sweden – A Population-Based Register Study. PLoS ONE. 2014. DOI: 10.1371/journal.pone.0098024

[10] Prevalence and severity of fatigue in psoriasis and psoriatic arthritis. Advances in Dermatology and Allergology. 2020. DOI: 10.5114/ada.2019.83629

[11] Beyond inflammation: the molecular basis of bone remodeling in axial spondyloarthritis and psoriatic arthritis. Frontiers in Immunology. 2025. DOI: 10.3389/fimmu.2025.1599995

[12] Predictors of functional deterioration in Chinese patients with Psoriatic arthritis: a longitudinal study. BMC Musculoskeletal Disorders. 2014. DOI: 10.1186/1471-2474-15-284

[13] The GOLMePsA study protocol: an investigator-initiated, double-blind, parallel-group, randomised, controlled trial of GOLimumab and methotrexate versus methotrexate in early diagnosed psoriatic arthritis using clinical and whole body MRI outcomes. BMC Musculoskeletal Disorders. 2017. DOI: 10.1186/s12891-017-1659-1

[14] Pharmacoeconomic burden in the treatment of psoriatic arthritis: from systematic reviews to real clinical practice studies. BMC Musculoskeletal Disorders. 2014. DOI: 10.1186/1471-2474-15-25

[15] Systematic review, network meta-analysis and economic evaluation of biological therapy for the management of active psoriatic arthritis. BMC Musculoskeletal Disorders. 2014. DOI: 10.1186/1471-2474-15-26

[16] The TICOPA protocol (TIght COntrol of Psoriatic Arthritis): a randomised controlled trial to compare intensive management versus standard care in early psoriatic arthritis. BMC Musculoskeletal Disorders. 2013. DOI: 10.1186/1471-2474-14-101

[17] Changes of inflammation in patients with psoriatic arthritis after high intensity interval training assessed by ultrasound and MRI, a randomized controlled trial. BMC Musculoskeletal Disorders. 2023. DOI: 10.1186/s12891-023-06871-3

[18] Evaluation of the novel ultrasound score for large joints in psoriatic arthritis and ankylosing spondylitis: six month experience in daily clinical practice. BMC Musculoskeletal Disorders. 2013. DOI: 10.1186/1471-2474-14-358

[19] Exploring clusters based on ultrasound-detected inflammation in patients with psoriatic arthritis: a post-hoc analysis from the ULTIMATE trial. BMC Musculoskeletal Disorders. 2026. DOI: 10.1186/s12891-025-09434-w

[20] Back pain and health status in patients with clinically diagnosed ankylosing spondylitis, psoriatic arthritis and other spondyloarthritis: a cross-sectional population-based study. BMC Musculoskeletal Disorders. 2016. DOI: 10.1186/s12891-016-0960-8

[21] Characterization of bone metabolism in hungarian psoriatic arthritis patients: a case–control study. BMC Musculoskeletal Disorders. 2021. DOI: 10.1186/s12891-021-03952-z

[22] Imaging of psoriatic nail disease pre and post anti-TNF therapy shows persistent subclinical inflammation despite good clinical response. BMC Musculoskeletal Disorders. 2013. DOI: 10.1186/1471-2474-14-s1-a7

[23] Soluble Biomarkers of Cartilage and Bone Metabolism in Early Proof of Concept Trials in Psoriatic Arthritis: Effects of Adalimumab Versus Placebo. PLoS ONE. 2010. DOI: 10.1371/journal.pone.0012556

[24] Treatment patterns and costs for anti-TNFα biologic therapy in patients with psoriatic arthritis. BMC Musculoskeletal Disorders. 2016. DOI: 10.1186/s12891-016-1102-z

[25] VEGF, FGF1, FGF2 and EGF gene polymorphisms and psoriatic arthritis. BMC Musculoskeletal Disorders. 2007. DOI: 10.1186/1471-2474-8-1

[26] Fatigue in psoriatic arthritis – a cross-sectional study of 246 patients from 13 countries. Joint Bone Spine. 2016. DOI: 10.1016/j.jbspin.2015.07.017

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