Multidimensional investigation of chronic pain experience and physical functioning following hip fracture surgery: clinical implications.

Introduction: Older adults experience significant chronic pain after hip fracture, resulting in decreased physical functioning. However, pain investigation in this population is mostly limited to self-reported pain intensity. Detailed pain assessment may identify intervention targets other than pain relief. The aim of this study is to investigate multiple dimensions of pain experience (intensity, sensory, affective, evaluative and miscellaneous dimensions) and to correlate them to lower limb functionality and limitations in daily living activities.
Methods: We conducted a cross-sectional study of 50 older adults (77.1 ± 8.1 years old) who underwent hip fracture surgery in the past 4 months. We used the Numeric Rating Scale (NRS), the McGill Pain Questionnaire (MPQ) and an algometer to assess pain intensity, pain quality and pressure pain threshold, respectively. Lower limb functionality and limitation in basic (activities of daily living (ADL)) and instrumental activities of daily living (IADL) were assessed using the Short Physical Performance Battery (SPPB) and the Brazilian OARS Multidimensional Functional Assessment Questionnaire.
Results: Participants described pain as brief, momentary and transient, especially during weight-bearing activities. Although the pain intensity measured by the NRS was reported as moderate to severe (7.5 ± 1.6 points), it was not correlated with physical functioning. However, we observed a moderate negative correlation between pressure pain threshold, ADL and IADL disability ( r  = -0.41, p  < 0.01). Among pain qualities, the sensory category was moderately negatively correlated to SPPB ( r  = -0.41, p  < 0.01), and the evaluative category was moderately correlated to ADL and IADL disability ( r  = 0.43, p  < 0.01).
Conclusion: Pain can be present 4 months after hip fracture surgery, particularly during weight-bearing activities, and it is associated with poor lower limb functionality, as well as ADL and IADL disability. Older adults may benefit from pain assessments that go beyond pain intensity measurements after hip fracture, as this helps clinicians optimise pain management and overall functional recovery.
Competing Interests: Conflict of interest: The author(s) declared no potential conflicts of interest with respect to the research, authorship and/or publication of this article.
(© The British Pain Society 2019.)