The subsequent injury categorisation (SIC) model: classification of subsequent injuries according to the most likely clinically relevant categories with different statistical dependencies between an index injury and a subsequent injury
| Subsequent injury characterised by body site and nature | New classification of subsequent injury in relation to an index injury i* (dependency category number) | Definition of Hamilton et al4† | Definition of Fuller et al7† |
|---|---|---|---|
| No injury | None (1) | Not considered | Not considered |
| Exact same injury in terms of body site and nature | Acute onset which occurs after full recovery of index injury i—related to index injury i (2) | Recurrent | Reinjury |
| Acute onset exacerbation or reinjury before full recovery—related to index injury i (3) | Exacerbation | ||
| Continual or sporadic experiences of pain or other physical discomfort—related to index injury i (4)‡ | Not clear | Not clear | |
| Continual or sporadic experiences of pain or other physical discomfort—not related to index injury i (5)‡ | |||
| Not related to index injury i (6) | Not considered | Not considered | |
| Injury to same body site but different nature | Occurrence related to index injury i (7) | Local—but possibility of different relationships to index injury not considered | New—but possibility of different relationships to index injury not considered |
| Occurrence not related to index injury i (8) | |||
| Injury to different body part (irrespective of nature) | Occurrence related to index injury i (9) | New—but possibility of different relationships to index injury not considered | New—but possibility of different relationships to index injury not considered |
| Occurrence not related to index injury i (10) |
*It is possible for there to be more than one index in a given sequence of injuries and the term index injury i refers to the ith index injury. i=1, 2, etc.
†These categorisations do not explicitly recognise new (multiple) index injuries, but the concept can be easily incorporated.
‡Categories relating to overuse injuries with no acute onset of symptoms.