Good physical function but reduced quality of life in children 3 years after ACL reconstruction

Purpose. To assess children's physical function and subjective knee status 1 and 3 years after anterior cruciate ligament (ACL) reconstruction. It was hypothesised that there was no difference between the operated and normal legs in relation to physical strength and function, that there was <-2 mm side-to-side difference in knee laxity, and that the subjective knee function was better 3 years after ACL reconstruction compared to 1 year after. Methods. Children (<16 years of age) who had an ACL reconstruction had follow-up with physical function tests (four hop tests and strength measurement in a power rig [PR]), anterior knee laxity (measured using a Rolimeter) and patient-reported outcome measures (Pedi-International Knee Documentation Committee [IKDC] and Knee injury and Osteoarthritis Outcome Score [KOOS]-Child) 1 and 3 years postoperatively. Changes from 1- to 3-year follow-up were evaluated with a paired t test. Results. Out of 148 ACL reconstructed children, 60 had all measures. The four hop tests and the PR all yielded a Limb Symmetry Index >90% at both follow-ups. There was a significant improvement from 1- to 3-year follow-up in two-hop tests (6 m on time and crossover hop). Side-to-side knee laxity was >2 mm in four children at 1- and 3-year tests. Pedi-IKDC scores increased, and KOOS-Child improved significantly from 1 to 3 years in two of the five domains: 'Sport' and 'Quality of life', but scores were lower than in a cohort of normal children. Conclusion. The children had good objective physical function 1 and 3 years after ACL reconstruction. However, scores from the KOOS-Child sport-specific function and quality of life domains were lower than in normal children.