Brazilian Journal of Pain
https://brjp.org.br/article/doi/10.63231/2595-0118.202663-en
Brazilian Journal of Pain
Original Article

Pressure pain threshold and functionality in people with knee osteoarthritis and chronic low back pain: observational study

Limiar de tolerância de dor à pressão e funcionalidade em pessoas com osteoartrite de joelho e lombalgia crônica: estudo observacional

Fábio Marcon Alfieri; Cristiano Franco Vitorino; Antenor Aguiar Santos; Sabrina Vesterini David; Natália Cristina de Oliveira Vargas e Silva

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Abstract

BACKGROUND AND OBJECTIVES: Chronic diseases such as chronic low back pain and knee osteoarthritis are associated with altered functionality and pressure pain threshold (PPT). Examining how these variables are present in each of these clinical conditions, or even when both diseases are present, is important for a better understanding of the pathophysiological mechanisms of pain in these highly prevalent diseases. The objective of this study was to compare the PPT and functionality of individuals with knee osteoarthritis, chronic low back pain, and both conditions.

METHODS: It was an observational cross-sectional study in which 113 individuals participated: 42 with low back pain (L), 33 with arthritis (OA) and 38 with both conditions (LOA). Pain intensity was assessed using the visual analogue scale, functional mobility was assessed using the Timed Up and Go test, and PPT was assessed using algometry. Participants completed the and McMaster Universities Index (WOMAC) e Roland-Morris Disability questionnaires.

RESULTS: A significant difference was observed between the L and LOA groups (p = 0.009) with regard to PPT in the right iliopsoas muscle. In the right vastus medialis, a difference was observed between OA and L (p = 0.042). The groups were similar in relation to functional mobility and pain intensity.

CONCLUSION: Although no significant differences were found in functionality, specific differences in PPT were observed in two of the 18 points evaluated. These findings suggest that the coexistence of chronic low back pain and knee OA does not necessarily contribute to increase pain and functional limitation in a generalized manner but may influence certain anatomical regions.

Keywords

Pain; Low back pain; Osteoarthritis; Pain threshold

Resumo

JUSTIFICATIVA E OBJETIVOS: Doenças crônicas como lombalgia e osteoartrite de joelho são associadas com alteração da funcionalidade e do limiar de tolerância de dor à pressão (LTDP). Conhecer como estas variáveis estão presentes em cada uma destas condições clínicas, ou quando ambas as doenças estão presentes, é importante para melhorar a compreensão dos mecanismos fisiopatológicos da dor nestas doenças de alta prevalência. O objetivo deste estudo foi comparar o LTDP e a funcionalidade de indivíduos com osteoartrite de joelho, lombalgia crônica e com ambas as condições.

MÉTODOS: Estudo transversal observacional no qual participaram 113 indivíduos: 42 portadores de lombalgia (L), 33 de osteoartrite de joelho (OA) e 38 portadores de ambas as condições (LOA). A avaliação da intensidade da dor foi realizada pela Escala Analógica Visual, a mobilidade funcional foi avaliada pelo teste Timed Up and Go, e a avaliação do LTDP realizada pela algometria. Os participantes responderam aos questionários Western Ontario and McMaster Universities Index (WOMAC) e Roland-Morris Disability.

RESULTADOS: Observou-se diferença significativa entre os grupos L e LOA (p = 0.009) no que diz respeito ao LTDP no músculo iliopsoas direito. No vasto medial direito foi observada diferença entre OA e L (p = 0.042). Os grupos foram semelhantes em relação à mobilidade funcional e intensidade da dor.

CONCLUSÃO: Embora não tenham sido encontradas diferenças significativas na funcionalidade, foram observadas diferenças pontuais no LTDP em dois dos 18 pontos avaliados. Esses achados sugerem que a coexistência de lombalgia crônica e OA de joelho não necessariamente contribuem para o aumento da dor e a limitação funcional de forma generalizada, mas pode influenciar determinadas regiões anatômicas.

Palavras-chave

Dor; Dor lombar; Osteoartrite de joelho; Limiar da dor

References

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Submitted date:
04/10/2025

Accepted date:
02/04/2026

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