• PURPOSE
    • (1) To compare sporting and recreational activity levels before and at a minimum 6 year follow-up, and (2) to assess the clinical and functional outcomes after anterior cruciate ligament (ACL) reconstruction in patients older than 55 years.
  • METHODS
    • A retrospective evaluation of prospectively collected data of 150 patients with a mean age of 64 ± 4.5 (57-74) years was evaluated 8.6 ± 1.4 (6-11) years after primary ACL reconstruction using hamstring autograft. All patients were assessed using the International Knee Documentation Committee scoring system (IKDC), Knee injury and Osteoarthritis Outcome Score (KOOS), Tegner activity level, and visual analog scale (VAS) for pain. The level of recreational activities was assessed using a sport-specific questionnaire. All patients were categorized according to Isolated and Combined ACL injury groups.
  • RESULTS
    • The data of 125 patients were analyzed at the last follow-up. While 25 patients were lost to follow-up, 117 of 125 patients were active before their injury in at least one sports discipline compared to 121 of 125 patients after ACL reconstruction. One hundred and two (82%) patients had returned to their recreational activities at the final follow-up. The mean IKDC subjective score increased from 49.5 ± 23.2 (11.5-100) to 76.2 ± 14.8 (33.3-100) (p < 0.0001). The mean KOOS sport increased significantly from 36 ± 36.2 (0-100) to 74.1 ± 25.5 (0-100) (p < 0.0001). The mean VAS score improved from 6.0 ± 2.6 (0-10) to 1.0 ± 1.4 (0-6) (p < 0.0001). There was no significant difference in the median Tegner activity level (preoperative 5 (2-8) vs. follow-up 5 (2-8) (n.s). There was no significant difference in the number of sports disciplines and duration when comparing pre-injury and mid-term follow-up activity after ACL reconstruction. High-impact activities experienced a significant decline, while a significant increase in participation in low-impact activities was recorded.
  • CONCLUSION
    • The majority of patients with symptomatic instability regained their pre-injury recreational activity level with excellent clinical and functional outcomes after arthroscopic ACL reconstruction. Nevertheless, a change from high-to low-impact activities has been observed.
  • LEVEL OF EVIDENCE
    • Level IV.