Instability Severity Index Score – ISIS
As discussed at the recent Brisbane Knee and Sports Surgery Physiotherapy Education evening, below is the instability severity index score (ISIS score) that Dr Macgroarty uses to help determine the best treatment for his athletes with antero-inferior shoulder instability after sport injuries.
Prognostic Factors Points
age at surgery
</= 20 2
> 20 0
degree of sports participation
competitive 2
recreational 0
type of sport
contact or forced overhead 2
other 0
shoulder hyper-laxity
antero-inferior 1
normal 0
Hill Sachs Lesion on AP radiograph
visible on ER view 2
not visible on ER 0
glenoid loss of contour on AP radiograph
loss of contour 2
no lesion 0
Total 10
</= 6 – acceptable recurrence rate of </= 10% with arthroscopic reconstruction
> 6 – recurrence risk of 70% with arthroscopic reconstruction
– recommend open surgery (e.g.. Laterjet procedure)
Reference
J Bone Joint Surg Br. 2007 Nov; 89(11) : 1470-7
