Pyogenic arthritis (PA) related mortality trends have not been studied well across various demographics in the United States (US). This cross-sectional study aimed to evaluate these trends among the US population aged ≥ 25 years from 1999–2020 using data from the CDC WONDER database. We identified all the deaths where PA was listed as the underlying or contributing cause of death, using the ICD-10 code M00. Age-adjusted mortality rates (AAMRs) were calculated per 1 million US population and the Joinpoint regression model was used to assess the annual mortality trends by calculating the annual percent change (APC) in AAMRs. Between 1999 and 2020, 13,965 total deaths occurred among US adults aged ≥ 25 years with an AAMR of 2.94. The overall AAMR of PA increased significantly from 1999 to 2020 with an APC of 2.01 (p < 0.01). Males and older adults had consistently higher AAMRs than their respective counterparts. Non-Hispanic (NH) American Indians/Alaska Natives and NH Blacks/African Americans had higher mortality rates compared with other racial groups. The Midwest had the highest overall AAMR, followed by the West, Northeast, and South regions. In conclusion, PA mortality has been on the rise and targeted interventions are warranted to reduce disproportionate mortality rates among vulnerable populations.

Chronic pain is a common problem in rheumatology. A distinction is made between nociceptive pain and nociplastic pain. Nociceptive pain is, for example, mechanistically explained by persistent inflammation. Neuropathic pain is caused by nerve damage of various possible causes. In contrast, nociplastic pain is not due to tissue damage or a lesion in the somatosensory nervous system—at least not with the currently available techniques. Nociplastic pain is based on an altered perception of pain through modulation of stimulus processing. The concept of central sensitization, together with other neurobiological and psychosocial mechanisms, is considered to be the best explanation for such pain conditions. The syndrome of fibromyalgia (FM), considered to be due to central sensitization, plays a major role in rheumatology—both in terms of differential diagnosis and because the management of inflammatory rheumatic diseases can be made more difficult by the simultaneous presence of FM. During the coronavirus pandemic, persistent pain syndromes with similarities to FM were described following a COVID-19 infection. There is a growing scientific controversy as to whether the so-called long COVID syndrome (LCS) is a separate entity or just a variant of FM.

Musculoskeletal ultrasound has become a valuable imaging tool in the diagnosis and management of rheumatologic disorders. Expertise in recognizing sonographic findings of pathology is the basis for its successful application in clinical use. This article will provide descriptions and a pictorial essay of ultrasound findings in common musculoskeletal manifestations of rheumatologic disorders.