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Functional outcome and risk of recurrent instability after primary traumatic anterior shoulder dislocation in young
C Michael Robinson1, Jonathan Howes, Helen Murdoch
1The New Royal Infirmary of Edinburgh, Old Dalkeith Road, Edinburgh EH16 4SU, Scotland. c.mike.robinson@ed.ac.uk
Insights
Recurrent shoulder instability and functional deficits are common after a first-time anterior dislocation, especially in young males. Early assessment within two years is crucial for effective intervention in these patients.
Area of Science:
- Orthopedic Surgery
- Sports Medicine
- Biostatistics
Background:
- Recurrent instability and functional impairment after primary glenohumeral dislocation are poorly understood in young patients.
- Prospective cohort studies are needed to evaluate outcomes and guide future clinical trial design.
- Understanding risk factors is essential for developing targeted interventions.
Purpose of the Study:
- To evaluate the prevalence of recurrent instability and functional impairment following a primary glenohumeral dislocation in young patients.
- To identify risk factors associated with recurrent instability.
- To provide guidelines for future clinical trials assessing interventions for primary shoulder dislocations.
Main Methods:
- A prospective cohort study of 252 patients (15-35 years old) with anterior glenohumeral dislocation.
- Patients were treated with sling immobilization and physical therapy, with regular follow-up for instability.
- Functional assessments were compared between patients with and without instability, and those who underwent operative stabilization.
Main Results:
- Instability developed in 55.7% within two years and 66.8% by five years post-dislocation.
- Younger males showed the highest risk, with 86.7% of recurrent instability cases occurring within two years.
- Most patients experienced measurable functional impairment at two years; sample size calculations suggest smaller trials are feasible.
Conclusions:
- Recurrent instability and functional deficits are frequent after nonoperative treatment for anterior shoulder dislocation.
- Younger males are at significantly higher risk for recurrent instability compared to females.
- Future trials should focus on assessing recurrent instability and functional deficits within the first two years using validated tools.
Background:
The prevalence and risk factors for recurrent instability and functional impairment following a primary glenohumeral dislocation remain poorly defined in younger patients. We performed a prospective cohort study to evaluate these outcomes. We also aimed to produce guidelines for the design of future clinical trials, assessing the efficacy of interventions designed to improve the outcome after a primary dislocation.
Methods:
We performed a prospective cohort study of 252 patients ranging from fifteen to thirty-five years old who sustained an anterior glenohumeral dislocation and were treated with sling immobilization, followed by a physical therapy program. Patients received regular clinical follow-up to assess whether recurrent instability had developed. Functional assessments were made and were compared for two subgroups: those who had not had instability develop and those who had received operative stabilization to treat recurrent instability.
Results:
On survival analysis, instability developed in 55.7% of the shoulders within the first two years after the primary dislocation and increased to 66.8% by the fifth year. The younger male patients were most at risk of instability, and 86.7% of all of the patients known to have recurrent instability had this complication develop within the first two years. A small but measurable degree of functional impairment was present at two years after the initial dislocation in most patients. Sample-size calculations revealed that a relatively small number of patients with a primary dislocation would be required in future clinical trials examining the effects of interventions designed to reduce the prevalence of recurrent instability and improve the functional outcome.
Conclusions:
Recurrent instability and deficits of shoulder function are common after primary nonoperative treatment of an anterior shoulder dislocation. There is substantial variation in the risk of instability, with younger males having the highest risk and females having a much lower risk. Future clinical trials to evaluate primary interventions should evaluate the prevalence of recurrent instability and functional deficits, with use of an assessment tool specifically for shoulder instability, during the first two years after the initial dislocation.