Cerebral Activation and Apprehension in Patients With Shoulder Instability.
- Conditions
- Shoulder Instability
- Interventions
- Diagnostic Test: functional Magnetic Resonance Imaging and clinical assessment
- Registration Number
- NCT06157788
- Lead Sponsor
- La Tour Hospital
- Brief Summary
In a similar study, the investigators demonstrated that shoulder stabilization could allow the brain to partially "recover". Patients with shoulder apprehension underwent clinical and fMRI examination before and one year after shoulder stabilization surgery. Clinical examination showed a significant improvement in postoperative shoulder function compared with preoperative. Coherently, results showed a decreased activation in the left pre-motor cortex postoperatively, demonstrating that stabilization surgery induced improvements both at the physical and at the brain levels, one year postoperatively. Most interestingly, right-frontal pole and right-occipital cortex activity was associated with good outcome in shoulder performance.
- Detailed Description
Fear, anxiety and anticipation of situations that could lead to a dislocation are essential cognitive processes in shoulder apprehension. Functional magnetic resonance imaging (fMRI) measures brain activity by detecting changes associated with blood flow. This technique relies on the fact that cerebral blood flow and neuronal activation are coupled. When an area of the brain is in use, blood flow to that region also increases. Recently, investigators used fMRI with visual apprehension stimulation to explore neuronal connections and cerebral changes induced by shoulder dislocation. Several cerebral areas were modified during those analyses, representing the different aspects of shoulder apprehension. Specific reorganizations were found in apprehension-related functional connectivity of the primary sensory-motor areas (motor resistance), dorsolateral prefrontal cortex (cognitive control of motor behavior), and the dorsal anterior cingulate cortex/dorsomedial prefrontal cortex and anterior insula (anxiety and emotional regulation).
Those regions are involved in the cognitive control of motor behavior. Hence, there is a motor control anticipation and muscular resistance (protective reflex mechanism), in order to avoid shoulder movement that could lead to dislocation. Another recent study published by Shitara et al. analyzed cerebral changes induced by shoulder dislocation in 14 patients. Although results were similar to the investigators' study, they observed a larger and less specific spectrum of activated cerebral areas, that may be explained by the fact that they projected static and abstract images during fMRI acquisition that may be prone to vaguer and subjective interpretation, and that moreover did not convey the dynamic component inherent to apprehension. In a subsequent study, investigators extended these findings by investigating further structural alterations in patients with shoulder apprehension. The investigators found that fractional anisotropy, representing white matter integrity, was increased in the left internal capsule and partially in the thalamus of studied patients compared to healthy controls. Fractional anisotropy correlated positively with pain visual analogue scale (VAS) scores (p \< .05) and negatively with simple shoulder test (SST) scores (p \< .05). This suggests an abnormal increased axonal integrity and therefore pathological structural plasticity due to the over-connection of white matter fibers in the motor pathway. These structural alterations affect several dimensions of shoulder apprehension as pain perception and performance in daily life.
The neuronal changes previously mentioned and presented in shoulder apprehension can also be assessed in daily clinical practice. Indeed, Cunningham et al. correlated clinical scores and tests (Rowe, pain VAS, SST, subjective shoulder value (SSV), WOSI) with functional cerebral imaging in patients with shoulder apprehension. Their hypothesis was that it might be possible to simplify shoulder instability scores as it has been previously possible with rotator cuff and SLAP lesions, and that at least one score could encompass the spectrum of these cerebral alterations. They found that the Rowe score integrated several aspects of apprehension, notably the motor and sensory functions, as well as pain anticipation and attention. This could be explained by the fact that the Rowe score is the only tested score that integrates range of motion. This also provides the ability to evaluate motor component (stability and motion) and cognitive component (perceived pain) of shoulder apprehension. Pain VAS and WOSI seemed to correlate with less brain networks compared to the Rowe. This could be explained by the fact that their assessment is focused only on cognitive aspects (pain for pain VAS, shoulder function in everyday life activities for WOSI), and that they do not integrate pure shoulder motion. SST and SSV were not found to be associated with brain network alterations, which is corroborated by the fact that they are general shoulder scores and were not specifically validated for instability.
In a similar study, the investigators demonstrated that shoulder stabilization could allow the brain to partially "recover". Patients with shoulder apprehension underwent clinical and fMRI examination before and one year after shoulder stabilization surgery. Clinical examination showed a significant improvement in postoperative shoulder function compared with preoperative. Coherently, results showed a decreased activation in the left pre-motor cortex postoperatively, demonstrating that stabilization surgery induced improvements both at the physical and at the brain levels, one year postoperatively. Most interestingly, right-frontal pole and right-occipital cortex activity was associated with good outcome in shoulder performance.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- Male
- Target Recruitment
- 19
- The 15 patients operated 10 years ago and the 15 patients used as a control group in a previous analysis.
- Previous recurrence of instability reported in the past 10 years.
- Major medical disorders (cancer, cardiac illness)
- Sustained head injury
- Psychiatric or neurologic disorders
- Alcohol or drug abuse
- Use of psychotropics, stimulants, and beta-blockers on a regular basis
- Abnormal or non-corrected-to-normal visual acuity
- New contra-indication for fMRI, such as claustrophobia, pacemaker
Study & Design
- Study Type
- OBSERVATIONAL
- Study Design
- Not specified
- Arm && Interventions
Group Intervention Description Control Group functional Magnetic Resonance Imaging and clinical assessment The control group consisted in healthy volunteers with no history of shoulder injury, instability, or hyperlaxity, the latter defined as more than 85° of external rotation elbow against waist, or hyperabduction over 105°, who had undergone fMRI at baseline. Operated group functional Magnetic Resonance Imaging and clinical assessment Patients were male individuals with anterior glenohumeral instability, who underwent preoperative fMRI, then surgical stabilization by 2 specialized shoulder surgeons, followed by a new fMRI one year postoperatively.
- Primary Outcome Measures
Name Time Method Task-related brain activation At 10 post-operative years Temporal independent component analysis of functional Connectivity
- Secondary Outcome Measures
Name Time Method Rowe score At 10 post-operative years From 0 (worst) to 100 (best)
Simple Shoulder Test At 10 post-operative years From 0 (worst) to 12 (best)
Changes in grey matter At 10 post-operative years Structural changes in grey matter using voxel-based morphometry
Changes in white matter At 10 post-operative years structural changes in white matter using tract-based spatial statistics analysis with multimodal Magnetic Resonance imaging
Western Ontario Shoulder Instability Index At 10 post-operative years From 0 (worst) to 100 (best)
Single Assessment numeric evaluation score At 10 post-operative years Single Assessment numeric evaluation (SANE). From 0 (worst) to 100 (best)
Subjective Shoulder Value At 10 post-operative years SSV (Subjective Shoulder Value). From 0 (worst) to 100 (best)
Behavioural responses to apprehension videos At 10 post-operative years Minimum 1 (No Apprehension), Maximum 7 (Apprehension)
Pain on visual analog scale At 10 post-operative years From 0 (no pain) to 10 (extreme pain)
Trial Locations
- Locations (1)
La Tour hospital
🇨🇭Meyrin, Geneva, Switzerland