06/01/2026
Do NOT rush into ACL surgery before attempting the Delaware-Oslo Coper Criteria.
The Delaware-Oslo Coper Criteria is a screening tool used to determine whether an individual may be able to return to a Level 1 sport without ACL reconstruction surgery.
Before being classified as a potential coper, you must first complete a minimum of 5 weeks of neuromuscular and strength training. In some cases, it can take up to 1 year to meet the classification criteria.
To be classified as a coper, you must achieve:
✅ Greater than 80% on the Knee Outcome Survey (KOS)
✅ Less than or equal to 1 episode of knee giving way during activity
This demonstrates the ability to maintain knee stability despite ACL deficiency.
✅ Greater than 60% on the Global Rating Scale of Knee Function
✅ Greater than 80% limb symmetry on hop testing
This demonstrates the injured knee can perform at a majority of the capacity of the uninjured side.
Important: Passing the Delaware-Oslo Coper Criteria does NOT mean you are ready to return to sport. It simply determines whether you qualify to continue progressing through rehabilitation with the goal of returning to a Level 1 sport.
For sports such as soccer, football, and basketball, athletes should still progress through comprehensive return-to-sport rehabilitation and demonstrate:
- Greater than 90% quadriceps strength symmetry
- Drop jump RSI > 1.3 m/s
- Single-leg drop jump RSI > 0.5 m/s
- Triple hop distance > 2.7x body height for men and > 2.5x body height for women. AND Greater than 90% limb symmetry index.
- Tolerance to full-speed reactive change-of-direction drills in a sport-specific environment
At any point, episodes of instability or knee giving way may result in reclassification as a non-coper.
Whether you ultimately return without surgery or proceed with ACL reconstruction, completing high-quality rehabilitation is essential. If surgery is required, you will enter the procedure stronger, more prepared, and with a better foundation for recovery.
Work closely with a physiotherapist experienced in strength & conditioning and return-to-sport testing to determine the best path for your individual situation.