Objective <p>The purpose of this study was to compare the all-inside (Group A) and conventional (Group B) anterior cruciate ligament reconstruction (ACLR) methods in terms of tunnel or socket morphology and functional outcomes.</p> Design <p>Retrospective cohort study.</p> Methods <p>Tunnel morphology was evaluated using a computed tomography scan and compared with intra-operative tibial and femoral drilling diameter at a mean follow-up of 29&#xa0;months following ACLR between these groups. Clinical outcomes were studied using the 2000 IKDC subjective knee score, Lysholm score, and Knee Laxity Tester.</p> Results <p>The study compared the tunnel morphology of all-inside (Group A; 20 subjects) and conventional (Group B; 43 subjects) ACLR methods in 63 patients. The results showed no significant differences in functional outcomes between the two groups. However, the femoral tunnel shrunk in Group A by 1.32% and 6.9% at articular (F1) and mid-portion (F2), respectively, compared to Group B at the same locations. The tibial tunnel widened in Group A by 1.91% and 11.07% at articular (T1) and mid-portion (T2) respectively, compared to Group B at the same locations. The statistical analysis showed a significant difference in the tunnel diameter change between the two groups at F2 (<i>P</i> = 0.02), T1 (<i>P</i> = 0.008), and T2 (<i>P</i> = 0.04).</p> Conclusion <p>This study found that patients who underwent all-inside ACLR (Group A) had similar functional outcomes to those who underwent conventional ACLR (Group B). However, “tunnel diameter changes were overall more favourable in the all-inside group, particularly on the femoral side”.</p>