The IES-6 appears to be a robust brief measure of posttraumatic stress reactions. It may be useful for research in epidemiological studies, and it may also have a role as a screening instrument in clinical practice.

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Ultra-High Molecular Weight Polyethylene (UHMWPE) is used in biomedical applications due to its high wear-resistance, ductility, and biocompatibility. A great deal of research in recent decades has focused on further improving its mechanical and tribological performances in order to provide durable implants in patients. Several methods, including irradiation, surface modifications, and reinforcements have been employed to improve the tribological and mechanical performance of UHMWPE. The effect of these modifications on tribological and mechanical performance was discussed in this review.

ObjectiveTo summarize evidence for the prevalence of posttraumatic stress disorder (PTSD) among persons with chronic pain (CP).MethodsWe searched databases for studies published between January 1995 and December 2016, reporting the prevalence of PTSD in persons with CP. Two reviewers independently extracted data and assessed the risk of bias. We calculated the pooled prevalence using a random-effects model and performed subgroup analyses according to pain location, the population and assessment method.ResultsTwenty-one studies were included and the PTSD prevalence varied from 0–57%, with a pooled mean prevalence of 9.7%, 95% CI (5.2–17.1). In subgroup analysis, the PTSD prevalence was 20.5%, 95% CI (9.5–39.0) among persons with chronic widespread pain, 11.2%, 95% CI (5.7–22.8) among persons with headache, and 0.3%, 95% CI (0.0–2.4) among persons with back pain. The prevalence in clinical populations was 11.7%, 95% CI (6.0–21.5) and in non-clinical populations 5.1%, 95% CI (0.01–17.2). In studies of self-reported PTSD symptoms, PTSD prevalence was 20.4%, 95% CI (10.6–35.5), and in studies where structured clinical interviews had been used to assess PTSD its prevalence was 4.5%, 95% (CI 2.1–9.3). The risk of bias was medium for most studies and the heterogeneity was high (I2 = 98.6).ConclusionPTSD is overall more prevalent in clinical cohorts of persons with CP and particularly in those with widespread pain, but may not always be more prevalent in non-clinical samples of persons with CP, compared to the general population. There is a large heterogeneity in prevalence across studies. Future research should identify sources of heterogeneity and the mechanisms underlying the comorbidity of the two conditions.

The Norwegian version of the PCL-S performed well as a diagnostic instrument for detecting PTSD in epidemiological research.