Concussion in Sport Australia brings together the most contemporary evidence-based information on concussion for athletes, parents, teachers, coaches and medical practitioners
There is increasing concern in Australian sport and across the Australian community about sport-related concussion. It is crucial that every concussion is treated seriously, and every concussion is managed as if there is the potential for long-term consequences, regardless of the size of the risk.
The best way to avoid both short-term and potential long-term effects from concussion is to prevent concussion where possible, treat each concussion with an abundance of caution and not return the athlete to sport prematurely.
The updated Concussion and Brain Health Position Statement 2024 (CBHPS24) and associated resources are designed to help support medical practitioners in the diagnosis and management of concussion. The resources provide guidance regarding the use of commonly used clinical tools, to be used in conjunction with clinical judgement, in the assessment of the concussed athlete.
If in doubt, sit them out.
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"When a doctor is assessing someone they’re not familiar with often there’s a need to corroborate evidence with others."
Concussion is a type of brain injury. It is a complex injury that is challenging to evaluate and manage. The Concussion in Sport Group (CISG) international Consensus Statement defines concussion as ‘a traumatic brain injury, induced by biomechanical forces’. It generally results from a knock to the head, face or neck - but may be anywhere on the body which transmits force to the head. Concussion involves short-lived impairment of neurological function. Concussion is an evolving injury that may change over the first few hours or over a few days. In most adult cases, symptoms are resolved within 14 days of injury.
Diagnosing concussion can be difficult - but is critical to correctly managing and preventing further injury.
Diagnosis relies on the clinical assessment of symptoms and signs. There is no specific diagnostic test which confirms the presence or otherwise of concussion.
For Adults: Health care practitioners can use the Concussion in Sport Group Sport Concussion Assessment Tool 6 (SCAT6), opens in a new tab as part of an overall clinical assessment to assess potential concussions.
For Children: The Child Sport Concussion Assessment Tool (Child-SCAT6), opens in a new tab can be used to assess concussion in children aged 5 – 12 years.
People without medical training can use the Concussion Recognition Tool 6, opens in a new tab, also developed by the Concussion in Sport Group.
For the management of concussion for 3-days or longer post-concussion incident, The Sport Concussion Office Assessment Tool 6 (SCOAT6) (bmj.com), opens in a new tab can be used.
Critical symptoms/signs | Obvious symptoms/signs | Subtle symptoms/signs |
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If an athlete displays these symptoms/signs they may have a more serious injury. They should be immediately taken to the nearest emergency department. |
First-aid principles still apply for athletes suspected of having a concussion. Responders should systematically assess the airway, breathing, circulation, disability and exposure of the athlete in all situations.
Cervical spine injuries should be suspected if there is any loss of consciousness, neck pain or a mechanism that could lead to spinal injury. Until a cervical spine injury can be ruled out, undertake manual inline stabilisation and apply a hard collar.
In diagnosing concussion, health care practitioners should do a clinical history and examination that includes:
As part of the assessment health care practitioners may use:
Currently, no serum biomarkers assist in the diagnosis of concussion. Blood tests and medical imaging is not indicated in the diagnosis or management of uncomplicated concussion.
Health care practitioners often have athletes present to the clinic during the week, having suffered a potential concussion over the previous weekend. This poses challenges. If there is any suspicion that a concussion occurred on the weekend, the health care practitioner should assume that a concussion did in fact occur. There is no test or series of tests which can conclude that a concussion did not occur.
Video technology is used by many professional sports to support identification of concussion, differentiate between mandatory and discretionary concussion signs and, in some instances, assist with return to sport decisions. The 2017 Berlin Concussion in Sport Group Consensus Statement, opens in a new tab identifies six steps for video-review focused on concussion identification.
Six key video-review steps for the team clinician
Any athlete with suspected concussion should be REMOVED FROM SPORT, medically assessed and monitored for deterioration. No athlete diagnosed with concussion should be returned to play on the day of injury.
Minimum criteria for diagnosing concussion are:
Any athlete with suspected or confirmed concussion should:
Specifically, concussed athletes should avoid:
If the athlete is diagnosed with concussion, immediate management is physical and cognitive rest. This may include time off school or work, and relative rest from cognitive activity. Having rested for 24 – 48 hours after sustaining a concussion, the athlete can begin moderate intensity physical activity - as long as the activity doesn’t cause significant and sustained deterioration in symptoms. Concussive symptoms usually resolve in 10 – 14 days.
Sport-related concussions are common in children and adolescents aged 18 years or younger. For this age group, a more conservative approach to diagnosis and management is recommended. This is because this age group:
‘Return to learn’ is about the athlete’s gradual return to their usual program at school or work.
‘Return to learn’ should take priority over ‘Return to sport’. School programs may need to include more regular breaks, rests and increased time to complete tasks.
Health care practitioners can use the Return to Learn Care Plan to communicate to teachers the requirements for a concussed child or adolescent.
‘Return to sport’ is about the athlete’s gradual return to full sporting activity.
Having rested for 24 – 48 hours after sustaining a concussion, the patient can begin moderate intensity physical activity - as long as the activity doesn’t cause significant and sustained deterioration in symptoms. Concussive symptoms usually resolve in 10 - 14 days, after which the athlete can begin a staged return to sport.
Medical practitioners can use these Graded Return to Sport Frameworks to inform their Return to sport patient programs.
Predictors of clinical recovery can assist the health care practitioner in managing the concussed athlete. These predictors are associated with protracted recovery:
There is a potential link between mental illness and concussion, although the relationship is not clear. Athletes with a history of mental illness require a more cautious approach. A conservative Return to Sport strategy is recommended.
There are a number of organisations with information on mental illness and where to go for help:
Chronic traumatic encephalopathy neuropathological change (CTE-NC) is a neurodegenerative pathology associated with a history of repeated head trauma. CTE-NC can only be diagnosed by post-mortem histopathological examination.
There are a growing number of case studies and case series which document change (CTE-NC) in retired athletes with a history of RHT. There remain many uncertainties about the strength of the association between RHT, concussion, and CTE-NC.
CTE-NC is not an inevitable consequence of exposure to repeated head trauma. Further research is required to understand the prevalence of CTE-NC in athletic cohorts and the factors that predispose some athletes to the development of CTE-NC following exposure to RHT. Properly designed prospective studies, which control for potential confounding variables, are required to improve our understanding of CTE-NC and why some individuals are susceptible
CTE-NC is characterized by the build-up of hyperphosphorylated tau (p-tau) in neurofibrillary tangles (NFTs), neurites, and, sometimes, astrocytes, surrounding small blood vessels in a patchy distribution at the sulcal depths of the cerebral cortex.
Most of the reported cases of CTE-NC have been detected in sport brain banks. There are issues with significant selection bias in these studies. Research using non-sport brain banks in Australia, the US and Europe show rates of CTE-NC of less than 1%.
The potential contribution of confounders, such as genetic predisposition, psychiatric illness, alcohol and drug use or co-existing dementia, is not adequately accounted for in the current literature.
Acute cerebral oedema or ‘second impact syndrome’ has received media attention due to its catastrophic outcomes. Acute cerebral oedema refers to rapid cerebral swelling that can occur when a second concussive injury is sustained during a ‘vulnerable’ period when the brain has not recovered from an initial insult. Animal models have demonstrated that there is a period of vulnerability during which further injury can result in significant axonal injury with associated ion channel damage. It is thought that a second impact may not be needed for the swelling to develop.
The condition is rare and the only available literature consists of case studies which are inadequate to provide a good understanding of the mechanisms and risk factors. Further research is needed to better understand the pathophysiology and risk factors for ‘second impact syndrome’.