1. Treatment for Acute Anterior Cruciate Ligament (ACL) Tear
By: Kyle Zeka

2. Purpose of This Study
A five year outcome of randomized trial was used to analyze ACL tears with different reconstruction times

3. Null and Alternative Hypothesis
Null Hypothesis: Early ACL reconstruction and rehabilitation has improved results on mobility and flexibility
Alternative Hypothesis: Early ACL reconstruction and rehabilitation has no improvement on mobility and flexibility

4. Important Definitions and Acronyms
(KOOS) - Knee injury and osteoarthritis score
Osteoarthritis - A type of arthritis that occurs when flexible tissue at the ends of bones wears down
Rehabilitation - Restoring someone’s health or normal life through training and therapy after injury
Reconstruction - repair of an organ or part by reconstructive surgery

5. How The Study Was Conducted
121 patients between ages were selected with ACL tears in a previously uninjured knee
62 patients were assigned to early reconstruction on their ACL, 59 were assigned to a delayed reconstruction
5 years later they regathered the 121 patients
Compared the early reconstruction to the delayed reconstruction

6. Delayed ACL Reconstruction

7. Results of the Study
Immediate reconstruction did not improve the results of mobility or flexibility, delayed reconstruction proved to have the same effect on the patient's ACL injury

8. Was the Null Hypothesis Rejected or Accepted?
The null hypothesis was rejected as there was no improvement in the ACL injuries, there was no evidence saying that one procedure was more harmful or effective than the other