La Trobe trial confirms supervised exercise safety after ACL reconstruction

Researchers from La Trobe University investigated whether physiotherapist-supervised exercise and education could safely improve outcomes for young adults experiencing persistent knee problems 9 to 36 months after anterior cruciate ligament reconstruction (ACLR) doi.orgAnnals of Internal Medicinedoi.orgOpen source ↗. The findings of the randomized parallel-group trial, named SUPER-Knee and funded by Australia's National Health and Medical Research Council, were published in the Annals of Internal Medicine. The study enrolled 184 participants aged 18 to 40 years to test a 4-month intervention against a control group receiving a single education session and self-directed exercise materials.

Symptom relief and strength

Participants in the supervised exercise group (SUPER) demonstrated superior improvements in patient-reported knee scores compared to the control group (14.1 versus 9.4 points; adjusted mean difference of 4.8 [95% CI, 1.4 to 8.2]). At the 4-month mark, the supervised protocol resulted in larger gains in thigh muscle strength and significantly higher rates of perceived improvement, with 73% reporting pain relief compared to 40% in the control group. Over the full 12-month evaluation window, the initial gains achieved by the supervised cohort were sustained, while the control group narrowed the statistical gap through continued self-directed recovery.

Cartilage integrity on MRI

To evaluate concerns that progressive physical loading might exacerbate joint damage or accelerate early-onset osteoarthritis, researchers monitored joint structures using magnetic resonance imaging at 4 and 12 months. Quantitative evaluations showed no between-group differences in cartilage thickness or tissue composition. The authors reported that progressive exercise supervised by physiotherapists did not cause detectable cartilage deterioration in patients recovering from ACL reconstruction. Although the trial demonstrated functional benefits without adverse joint remodeling, investigators noted that unblinded participants represented a study limitation and long-term osteoarthritis prevention remains unproven.