Comparison of eras
| Era | Incidence (total) of PCL injuries per 10 000 player-hours | Incidence (centre bounce) of injuries per 10 000 player-hours | Incidence (non-centre bounce mechanisms) of injuries per 10 000 player-hours | Incidence of PCL injuries per 10 000 centre bounces |
| 1992–1998 | 11.0 | 0.5 | 10.5 | 0.8 |
| 1999–2004 | 12.9 | 3.7† | 9.2 | 5.6¶ |
| 2005–2008 | 5.9* | 0.6‡ | 5.3§ | 0.9** |
*Significantly lower than 1999–2004 era (χ2 = 9.4, p<0.01) and 1992–1998 era (χ2 = 6.7, p<0.01).
†Significantly higher than 1992–1998 era (χ2 = 11.2, p<0.01).
‡Significantly lower than 1999–2004 era (χ2 = 6.9, p<0.01).
§Lower than 1999–2004 era (χ2 = 3.7, p = 0.06) and significantly lower than 1992–1998 era (χ2 = 7.3, p<0.01).
¶Significantly higher than 1992–1998 era (χ2 = 11.9, p<0.01).
**Significantly lower than 1999–2004 era (χ2 = 6.7, p<0.01).