An Investigation of Sensorimotor Impairments in Individuals 4 weeks to 6 months following mild traumatic brain injury

Cervical spine sensorimotor deficits persist in people post-concussion despite minimal symptoms

BACKGROUND

The mechanisms of a concussion place stress on the cervical spine like that of a whiplash event, which can result in cervical spine dysfunction. This study aimed to determine if underlying cervical spine mobility and sensorimotor function deficits occur in individuals who are post-concussion with near resolution of symptoms.

METHODS

Twenty-five participants with a self-reported concussive event within a year (PC group: post-concussion 157 + 120 d, 9 men, age: 25 ± 8 yr) and 26 comparable peers (Peer group, 9 men, age: 25 ± 7 yr) were tested. The Post-Concussion Symptom Scale (PCSS) quantified residual concussion symptoms. Participants completed cervical joint position error (JPE) and cervical spine joint mobility tests blinded from each other. Group mean differences were analyzed using t-tests.

RESULTS

The PC group had minimal symptoms (PCSS = 6.8 ± 6.5) but substantial differences in JPE tests compared to the Peer group (PC = 7.4 ± 1.8 cm; PG = 5.6 ± 1.1 cm; p < .001). Those PC participants with pain during joint testing (n = 15) had worse JPE (Painful = 8.1 ± 1.8 cm, No-pain = 6.3 ± 1.6 cm; p = .02) and less averaged lower cervical spine joint mobility compared to PC participants without pain (Painful = 0.66 ± 0.22, No-pain = 0.87 ± 0.19; p = .02, Normal motion = 1.0).

CONCLUSION

Following a concussion, it is a reasonable recommendation to screen the cervical spine to identify impairments in joint mobility and JPE that contribute to neck dysfunction.

Self-reported Dizziness, Postural Stability, and Sensory Integration After Mild Traumatic Brain Injury: A Naturalistic Follow-up Study

OBJECTIVE

The aim of the study is to evaluate changes in dizziness, postural stability, and sensory integration after mild traumatic brain injury over a 12-wk period.

METHODS

One hundred adults with mild traumatic brain injury were analyzed. The Dizziness Handicap Inventory questionnaire was used for subjective evaluations. Postural stability and modified Clinical Test of Sensory Interaction in Balance were used as objective measures at 0, 6, and 12 wks after mild traumatic brain injury.

DESIGN

Observational follow-up study.

RESULTS

Dizziness Handicap Inventory scores decreased significantly over time, indicating improved functional, emotional, physical, and overall aspects. Most indices of postural stability and modified Clinical Test of Sensory Interaction in Balance decreased significantly over time. The postural stability indices (overall and anteroposterior) and the modified Clinical Test of Sensory Interaction in Balance indices (eyes open on firm and foam surfaces) differed significantly between weeks 0 and 6, according to post hoc analysis. Furthermore, the modified Clinical Test of Sensory Interaction in Balance indices of eyes open on firm and foam surfaces and eyes closed on foam surface demonstrated significant differences between weeks 0 and 12.

CONCLUSIONS

Subjective and objective measurements indicated improvements in included adults from 0 wks to 6 and 12 wks after mild traumatic brain injury. However, balance dysfunction and sensory integration issues may persist beyond 12 wks after mild traumatic brain injury. The findings highlight the need for longer follow-up and tailored rehabilitation programs.

Elucidating the neuroimmunology of traumatic brain injury: methodological approaches to unravel intercellular communication and function

The neuroimmunology of traumatic brain injury (TBI) has recently gained recognition as a crucial element in the secondary pathophysiological consequences that occur following neurotrauma. Both immune cells residing within the central nervous system (CNS) and those migrating from the periphery play significant roles in the development of secondary brain injury. However, the precise mechanisms governing communication between innate and adaptive immune cells remain incompletely understood, partly due to a limited utilization of relevant experimental models and techniques. Therefore, in this discussion, we outline current methodologies that can aid in the exploration of TBI neuroimmunology, with a particular emphasis on the interactions between resident neuroglial cells and recruited lymphocytes. These techniques encompass adoptive cell transfer, intra-CNS injection(s), selective cellular depletion, genetic manipulation, molecular neuroimaging, as well as in vitro co-culture systems and the utilization of organoid models. By incorporating key elements of both innate and adaptive immunity, these methods facilitate the examination of clinically relevant interactions. In addition to these preclinical approaches, we also detail an emerging avenue of research that seeks to leverage human biofluids. This approach enables the investigation of how resident and infiltrating immune cells modulate neuroglial responses after TBI. Considering the growing significance of neuroinflammation in TBI, the introduction and application of advanced methodologies will be pivotal in advancing translational research in this field.