Background: A cruciate knee ligament injury is a serious injury to the knee, which often leads to arthritis of the knee joint. In Norway about 4000 people sustain this injury each year. This study investigates all patients in the Norwegian National Knee Ligament Registry (NKLR) who had a revision surgery registered.
Material and methods: NKLR is a prospective surveillance system for monitoring the outcome of cruciate ligament surgery. The registry collects information on all cases of cruciate ligament reconstruction in Norway. The registry contains information on age, gender, injury activity, operation methods, co-injuries, a self report scheme and more. The factors listed here were investigated to find correlation between them.
Results: 92 patients had a revision surgery registered, 58% of them were men. The largest group of patients were between 15 and 25 years and the activities that caused the most injuries were soccer and handball. The Knee injury and Osteoarthritis Outcome Score (KOOS) is a part of the NKLR surveillance. The score was significantly lower for patients with chondral damage when compared with the rest of the cohort. When comparing the whole cohort with a normal population, the factors that were mostly affected were activity in sports and recreation and knee-related quality of life.
Discussion: Chondral damage is the factor affecting KOOS the most. If the patient has a chondral injury at the primary operation, he or she is more likely to have the same injury or an even worse condition at revision. But the majority of the patients do not have such an injury. When examining the whole cohort there is little difference between the KOOS at primary operation compared to revision. The only difference is 10 points lower score for activity in sports and recreation.