Surgery ·
Supervised exercise improves knee symptoms after ACL reconstruction at four months
A randomized study of 184 adults with persistent knee problems after anterior cruciate ligament reconstruction compared four months of supervised physiotherapy with a home exercise program. Supervised training produced greater improvement at four months, but group differences were no longer significant at 12 months; MRI measures of cartilage did not differ.
- Supervised exercise improved symptoms more at four months.
- Clinically important improvement: 74% versus 51%.
- No significant group difference remained at 12 months.
- MRI cartilage measures did not differ.
Persistent knee symptoms are common in young adults after anterior cruciate ligament (ACL) reconstruction, and this population has an increased risk of early osteoarthritis. In a randomized study, 184 adults aged 18–40 years with knee symptoms lasting up to three years after surgery were assigned to four months of supervised physiotherapy or home exercise. The supervised group completed two sessions per week with a physiotherapist; the control group received one instructional session and a written program.
At four months, the combined score for pain, symptoms, activity function and quality of life was 4.8 points higher with supervised training on a 0–100 scale (95% CI 1.4–8.2). A predefined threshold for clinically important improvement was reached by 74% of the supervised group and 51% of the home-exercise group. Muscle strength improved more with supervision, while MRI measures of cartilage thickness and composition did not differ.
At 12 months, there was no significant between-group difference in the combined score, and 80% in each group had achieved clinically important improvement. The findings support a short-term benefit from structured physiotherapist-led exercise for symptomatic adults after ACL reconstruction, but do not establish that it prevents osteoarthritis. Longer follow-up is needed to assess lasting effects.
In practice
For adults aged 18–40 with persistent knee problems up to three years after ACL reconstruction, a four-month program of twice-weekly supervised physiotherapy improved a combined symptom and function score more than an instructed home program at four months. The difference was not significant at 12 months, when 80% in both groups had clinically important improvement. Supervised training also improved strength more, but MRI cartilage measures were unchanged; the study does not show that exercise prevents osteoarthritis.
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