Psoriatic arthritis

Psoriatic arthritis
Synonyms arthritis psoriatica, arthropathic psoriasis, psoriatic arthropathy
Severe psoriatic arthritis of both feet and ankles. Note the changes to the nails.
Classification and external resources
Specialty Rheumatology
ICD-10 L40.5 with M07.0–.3 or M09.0
ICD-9-CM 696.0
MedlinePlus 000413
eMedicine radio/578
Patient UK Psoriatic arthritis
MeSH D015535

Psoriatic arthritis is a long-term inflammatory arthritis that occurs in people affected by the autoimmune disease psoriasis.[1][2] The classic feature of psoriatic arthritis is swelling of entire fingers and toes with a sausage-like appearance.[3] This often happens in association with changes to the nails such as small depressions in the nail (pitting), thickening of the nails, and detachment of the nail from the nailbed.[3] Skin changes consistent with psoriasis (e.g., red, scaly, and itchy plaques) frequently occur before the onset of psoriatic arthritis but psoriatic arthritis can precede the rash in 15% of affected individuals.[3] It is classified as a type of seronegative spondyloarthropathy.

Genetics are thought to be strongly involved in the development of psoriatic arthritis.[3] Obesity and certain forms of psoriasis are thought to increase the risk.[3]

Psoriatic arthritis affects up to 30% of people with psoriasis and occurs in both children and adults.[3] Approximately 40-50% of individuals with psoriatic arthritis have the HLA-B27 genotype.[3] The condition is less common in people of Asian or African descent and affects men and women equally.[3]

Classification

There are five main types of psoriatic arthritis:[3]

Signs and symptoms

Pain, swelling, or stiffness in one or more joints is commonly present in psoriatic arthritis.[4] Psoriatic arthritis is inflammatory, and affected joints are generally red or warm to the touch.[4] Asymmetrical oligoarthritis, defined as inflammation affecting one to four joints during the first six months of disease, is present in 70% of cases. However, in 15% of cases, the arthritis is symmetrical. The joints of the hand that is involved in psoriasis are the proximal interphalangeal (PIP), the distal interphalangeal (DIP), the metacarpophalangeal (MCP), and the wrist. Involvement of the distal interphalangeal joints (DIP) is a characteristic feature and is present in 15% of cases.

In addition to affecting the joints of the hands and wrists, psoriatic arthritis may affect the fingers, nails, and skin. Sausage-like swelling in the fingers or toes, known as dactylitis, may occur.[4] Psoriasis can also cause changes to the nails, such as pitting or separation from the nail bed,[4] onycholysis, hyperkeratosis under the nails, and horizontal ridging.[5] Psoriasis classically presents with scaly skin lesions, which are most commonly seen over extensor surfaces such as the scalp, natal cleft and umbilicus.

In psoriatic arthritis, pain can occur in the area of the sacrum (the lower back, above the tailbone),[4] as a result of sacroiliitis or spondylitis, which is present in 40% of cases. Pain can occur in and around the feet and ankles, especially enthesitis in the Achilles tendon (inflammation of the Achilles tendon where it inserts into the bone) or plantar fasciitis in the sole of the foot.[4]

Along with the above-noted pain and inflammation, there is extreme exhaustion that does not go away with adequate rest. The exhaustion may last for days or weeks without abatement. Psoriatic arthritis may remain mild or may progress to more destructive joint disease. Periods of active disease, or flares, will typically alternate with periods of remission. In severe forms, psoriatic arthritis may progress to arthritis mutilans[6] which on X-ray gives a "pencil-in-cup" appearance.[3]

Because prolonged inflammation can lead to joint damage, early diagnosis and treatment to slow or prevent joint damage is recommended.[7]

Causes

The exact causes are not yet known, but a number of genetic associations have been identified in a genome-wide association study of psoriasis and psoriatic arthritis including HLA-B27.[8][9]

Diagnosis

Magnetic resonance images of the fingers in psoriatic arthritis. Shown are T1-weighted (a) pre-contrast and (b) post-contrast coronal images. Enhancement of the synovial membrane at the third and fourth proximal interphalangeal (PIP) and distal interphalangeal (DIP) joints is seen, indicating active synovitis (inflammation of the synovial membrane; large arrows). There is joint space narrowing with bone proliferation at the third PIP joint and erosions are present at the fourth DIP joint (white circle). Extracapsular enhancement (small arrows) is seen medial to the third and fourth PIP joints, indicating probable enthesitis (inflammation of a tendon insertion).
Sagittal magnetic resonance images of the ankle region in psoriatic arthritis. (a) Short tau inversion recovery (STIR) image, showing high signal intensity at the Achilles tendon insertion (enthesitis, thick arrow) and in the synovium of the ankle joint (synovitis, long thin arrow). Bone marrow edema is seen at the tendon insertion (short thin arrow). (b,c) T1 weighted images of a different section of the same patient, before (panel b) and after (panel c) intravenous contrast injection, confirm inflammation (large arrow) at the enthesis and reveal bone erosion at tendon insertion (short thin arrows).

There is no definitive test to diagnose psoriatic arthritis. Symptoms of psoriatic arthritis may closely resemble other diseases, including rheumatoid arthritis. A rheumatologist (a doctor specializing in autoimmune diseases) may use physical examinations, health history, blood tests and x-rays to accurately diagnose psoriatic arthritis.

Factors that contribute to a diagnosis of psoriatic arthritis include the following:

Other symptoms that are more typical of psoriatic arthritis than other forms of arthritis include inflammation in the Achilles tendon (at the back of the heel) or the plantar fascia (bottom of the feet), and dactylitis (sausage-like swelling of the fingers or toes).[10]

Differential diagnosis

Several conditions can mimic the clinical presentation of psoriatic arthritis including rheumatoid arthritis, osteoarthritis, reactive arthritis, gouty arthritis, systemic lupus erythematosus, and inflammatory bowel disease-associated arthritis.[3] In contrast to psoriatic arthritis, rheumatoid arthritis tends to affect the proximal joints (e.g., the metacarpophalangeal joints), involves a greater number of joints than psoriatic arthritis, and affect them symmetrically.[3] Involvement of the spinal joints is more suggestive of psoriatic arthritis than rheumatoid arthritis.[3] Osteoarthritis shares certain clinical features with psoriatic arthritis such as its tendency to affect multiple distal joints in an asymmetric pattern.[3] Unlike psoriatic arthritis, osteoarthritis does not typically involve inflammation of the sacroiliac joint.[3] Psoriatic arthritis sometimes affects only one joint and is sometimes confused for gout or pseudogout when this happens.[3]

Treatments

The underlying process in psoriatic arthritis is inflammation; therefore, treatments are directed at reducing and controlling inflammation. Milder cases of psoriatic arthritis may be treated with NSAIDs alone; however, there is a trend toward earlier use of disease-modifying antirheumatic drugs or biological response modifiers to prevent irreversible joint destruction.

Nonsteroidal anti-inflammatory drugs

Typically the medications first prescribed for psoriatic arthritis are NSAIDs such as ibuprofen and naproxen, followed by more potent NSAIDs like diclofenac, indomethacin, and etodolac. NSAIDs can irritate the stomach and intestine, and long-term use can lead to gastrointestinal bleeding.[11][12] Coxibs (COX-2 inhibitors) e.g. Celecoxib or Etoricoxib, are associated with a statistically significant 50 to 66% relative risk reduction in gastrointestinal ulcers and bleeding complications compared to traditional NSAIDs, but carry an increased rate of cardiovascular events such as myocardial infarction (MI) or heart attack, and stroke.[13][14] Both COX-2 inhibitors and other non-selective NSAIDS have potential adverse effects that include damage to the kidneys.

Disease-modifying antirheumatic drugs

These are used in persistent symptomatic cases without exacerbation. Rather than just reducing pain and inflammation, this class of drugs helps limit the amount of joint damage that occurs in psoriatic arthritis. Most DMARDs act slowly and may take weeks or even months to take full effect. Drugs such as methotrexate or leflunomide are commonly prescribed; other DMARDS used to treat psoriatic arthritis include cyclosporin, azathioprine, and sulfasalazine. These immunosuppressant drugs can also reduce psoriasis skin symptoms but can lead to liver and kidney problems and an increased risk of serious infection.

Biological response modifiers

The most recent class of treatment is called biological response modifiers or biologics has been developed using recombinant DNA technology. Biologic medications are derived from living cells cultured in a laboratory. Unlike traditional DMARDS that affect the entire immune system, biologics target specific parts of the immune system. They are given by injection or intravenous (IV) infusion.

Biologics prescribed for psoriatic arthritis are TNF-α inhibitors, including infliximab, etanercept, golimumab, certolizumab pegol and adalimumab, as well as the IL-12/IL-23 inhibitor ustekinumab.[3]

Biologics may increase the risk of minor and serious infections. More rarely, they may be associated with nervous system disorders, blood disorders or certain types of cancer.

Phosphodiesterase-4 inhibitors

A first-in-class treatment option for the management of psoriatic arthritis, apremilast is a small molecule phosphodiesterase-4 inhibitor approved for use by the FDA in 2014. By inhibiting PDE4, an enzyme which breaks down cyclic adenosine monophosphate, cAMP levels rise, resulting in the down-regulation of various pro-inflammatory factors including TNF-α and the up-regulation of the anti-inflammatory factor interleukin 10.

It is given in tablet form and taken by mouth. Side effects include headaches, back pain, nausea, diarrhea, fatigue, nasopharyngitis and upper respiratory tract infections, as well as depression and weight loss.

Patented in 2014 and manufactured by Celgene, there is no current generic equivalent available on the market.

Other treatments

A review found tentative evidence of benefit of low level laser therapy and concluded that it could be considered for relief of pain and stiffness associated RA.[15]

Retinoid etretinate is effective for both arthritis and skin lesions. Photochemotherapy with methoxy psoralen and long-wave ultraviolet light (PUVA) are used for severe skin lesions. Doctors may use joint injections with corticosteroids in cases where one joint is severely affected. In psoriatic arthritis patients with severe joint damage orthopedic surgery may be implemented to correct joint destruction, usually with the use of a joint replacement. Surgery is effective for pain alleviation, correcting joint disfigurement, and reinforcing joint usefulness and strength.

Epidemiology

Seventy percent of people who develop psoriatic arthritis first show signs of psoriasis on the skin, 15 percent develop skin psoriasis and arthritis at the same time, and 15 percent develop skin psoriasis following the onset of psoriatic arthritis.[16]

Psoriatic arthritis can develop in people who have any level severity of psoriatic skin disease, ranging from mild to very severe.[17]

Psoriatic arthritis tends to appear about 10 years after the first signs of psoriasis.[3] For the majority of people, this is between the ages of 30 and 55, but the disease can also affect children. The onset of psoriatic arthritis symptoms before symptoms of skin psoriasis is more common in children than adults.[18]

More than 80% of patients with psoriatic arthritis will have psoriatic nail lesions characterized by nail pitting, separation of the nail from the underlying nail bed, ridging and cracking, or more extremely, loss of the nail itself (onycholysis).[18]

Men and women are equally affected by this condition.[3] Like psoriasis, psoriatic arthritis is more common among Caucasians than African or Asian people.[3]

References

  1. ↑ Freedberg, Irwin M.; Fitzpatrick, Thomas B. (2003). Fitzpatrick's dermatology in general medicine (6th ed.). New York: McGraw-Hill. pp. 427–436. ISBN 0-07-138076-0.
  2. ↑ James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology (10th ed.). Saunders. p. 194. ISBN 0-7216-2921-0.
  3. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Ritchlin, CT; Colbert, RA; Gladman, DD (March 2017). "Psoriatic Arthritis". New England Journal of Medicine (Review). 376 (10): 957–70. PMID 28273019. doi:10.1056/NEJMra1505557.
  4. 1 2 3 4 5 6 Amherd-Hoekstra A, Näher H, Lorenz HM, Enk AH (May 2010). "Psoriatic arthritis: a review.". Journal of the German Society of Dermatology. 8 (5): 332–9. PMID 20015187. doi:10.1111/j.1610-0387.2009.07334.x.
  5. ↑ "Psoriatic Arthritis". Arthritis Action. Retrieved 12 August 2015.
  6. ↑ Davidson, Stanley, Davidson's principles and practice of medicine, Churchill Livingstone/Elsevier, p. 1096, 2010. ISBN 9780702030857. Accessed 2016-11-12.
  7. ↑ Farragher TM, Lunt M, Plant D, Bunn DK, Barton A, Symmons DP (May 2010). "Benefit of early treatment in inflammatory polyarthritis patients with anti-cyclic citrullinated peptide antibodies versus those without antibodies.". Ann. Rheum. Dis. 62 (5): 664–75. PMC 2962800 Freely accessible. PMID 20461787. doi:10.1002/acr.20207.
  8. ↑ Liu Y, Helms C, Liao W, et al. (March 2008). Leal SM, ed. "A genome-wide association study of psoriasis and psoriatic arthritis identifies new disease loci". PLoS Genet. 4 (3): e1000041. PMC 2274885 Freely accessible. PMID 18369459. doi:10.1371/journal.pgen.1000041.
  9. ↑ Rahman P, Elder JT (March 2005). "Genetic epidemiology of psoriasis and psoriatic arthritis". Ann. Rheum. Dis. 64 (Suppl 2): ii37–9; discussion ii40–1. PMC 1766868 Freely accessible. PMID 15708933. doi:10.1136/ard.2004.030775.
  10. ↑ "Psoriatic Arthritis". The Johns Hopkins University School of Medicine and the Johns Hopkins Arthritis Center. Retrieved 2011-05-04.
  11. ↑ Warner TD, Giuliano F, Vojnovic I, Bukasa A, Mitchell JA, Vane JR (1999). "Nonsteroid drug selectivities for cyclo-oxygenase-1 rather than cyclo-oxygenase-2 are associated with human gastrointestinal toxicity: a full in vitro analysis". Proc Natl Acad Sci U S A. 96 (13): 7563–8. PMC 22126 Freely accessible. PMID 10377455. doi:10.1073/pnas.96.13.7563.
  12. ↑ Scholer DW, Ku EC, Boettcher I, Schweizer A (April 1986). "Pharmacology of diclofenac sodium". Am. J. Med. 80 (4B): 34–8. PMID 3085490. doi:10.1016/0002-9343(86)90077-X.
  13. ↑ Antman EM, Bennett JS, Daugherty A, Furberg C, Roberts H, Taubert KA (Mar 2007). "Use of nonsteroidal antiinflammatory drugs: an update for clinicians: a scientific statement from the American Heart Association". Circulation. 115 (12): 1634–42. PMID 17325246. doi:10.1161/CIRCULATIONAHA.106.181424.
  14. ↑ Kearney PM, Baigent C, Godwin J, Halls H, Emberson JR, Patrono C (Jun 2006). "Do selective cyclo-oxygenase-2 inhibitors and traditional non-steroidal anti-inflammatory drugs increase the risk of atherothrombosis? Meta-analysis of randomised trials". BMJ. 332 (7553): 1302–8. PMC 1473048 Freely accessible. PMID 16740558. doi:10.1136/bmj.332.7553.1302.
  15. ↑ Brosseau, L; Robinson, V; Wells, G; Debie, R; Gam, A; Harman, K; Morin, M; Shea, B; Tugwell, P (19 October 2005). "Low level laser therapy (Classes I, II and III) for treating rheumatoid arthritis.". The Cochrane database of systematic reviews (4): CD002049. PMID 16235295. doi:10.1002/14651858.CD002049.pub2.
  16. ↑ "Psoriatic Arthritis". The Johns Hopkins University School of Medicine and the Johns Hopkins Arthritis Center. Retrieved 2011-05-04.
  17. ↑ Who's At Risk, Be Joint Smart (a coalition of the National Psoriasis Foundation and the Arthritis Foundation). Accessed 2016-11-12.
  18. 1 2 "Psoriatic Arthritis". WebMD LLC. Retrieved 2011-05-04.
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