This paper reports two studies of chronic pain patients (n = 444) relevant to the psychometric properties of the Pain Disability Index (PDI), a self-report instrument that has been used to assess the degree to which chronic pain interferes with various daily activities. In the first study, patients with high PDI scores reported more psychological distress (P less than 0.001), more severe pain c...

STUDY DESIGN A cross-sectional study design was performed. OBJECTIVE To validate the pain disability index (PDI) extensively in 3 groups of patients with musculoskeletal pain. SUMMARY OF BACKGROUND DATA The PDI is a widely used and studied instrument for disability related to various pain syndromes, although there is conflicting evidence concerning factor structure, test-retest reliability,...

Persistent pain is often accompanied by functional disability. This study investigated the effect of pain extent and the involvement of specific pain sites on pain-related disability, as determined by the Pain Disability Index (PDI). Complete data were available from 278 persistent facial pain (PFP) patients. Patients were divided into one of two groups based on drawings of their pain distribut...

BACKGROUND For more than 3 decades, spinal cord stimulation (SCS) has successfully been employed to treat neuropathic pain. Psychological factors are assumed to be important for the efficacy of SCS. However, the impact of psychological factors on the outcome of SCS has only rarely been studied. OBJECTIVES The aim of this study was to determine the influence of psychological factors such as an...

OBJECTIVE To determine whether 3 months of neck-specific exercises (NSEs) could benefit individuals with chronic whiplash-associated disorder (WAD) who were on a waiting list (WL) for treatment. DESIGN A prospective, randomized controlled study. SETTING Primary health care. PARTICIPANTS Individuals (N=41; 31 women, 10 men; mean age ± SD, 38±11.2y) with chronic (6-36mo) WAD, grades 2 and 3...

Background Psoriasis is one of the most common skin disorders with a prevalence rate of 0.1%-3%. Chronic nature, frequent relapses, absence of permanent cure, and the cosmetic disfigurement of psoriasis have a negative impact on quality of life (QoL) by causing psychological stress. Patients with psoriasis often have unambiguous ideas about the causes, controllability, consequences, and expecte...

introduction: myofascial pain syndrome (mps) treatment is challenging with a high recurrence rate and still lacks a clear treatment frame. therefore research on new, more efficient and long lasting effect treatment modalities is necessary. this study looked at the effects of intravenous laser therapy (ivl) and percutaneous low level laser (plll) in the management of shoulder mps. methods: in th...