Anterior cruciate ligament (ACL) reconstruction is a frequently performed surgical procedure to stabilize the knee joint biomechanically. At the same time, one of the goals is to improve clinical outcomes and return the patient to their daily life as early and ready as possible, as well as to sports activities. Remnant-preserving anterior cruciate ligament reconstruction is one of the reconstruction approaches that aim to achieve these goals earlier and more safely than the standard surgical procedure. However, there is no consensus in the literature regarding the effects of remnant-preserving ACL reconstruction on clinical outcomes and its superiority over the standard surgical procedure. Therefore, the aim of our study is to compare the proprioception and functionality of patients who underwent ACL reconstruction with the remnant-preserving approach, by classifying them according to stump size.

Inclusion Criteria:

• Aged between 18 - 45 years,
• Anatomical single-bundle ACL reconstruction with antero-medial portal technique using hamstring autograft due to a full-thickness ACL tear,
• Endobutton technique was used for femoral fixation,
• Has not had any trauma or surgery on the non-operated knee,
• Patients with a follow-up period of at least 12 months after surgery.

Exclusion Criteria:

• Fracture of lower extremity, posterior cruciate ligament, inner and outer lateral ligament tears accompanying anterior cruciate ligament tear,
• Patients who have undergone previous surgery on the targeted knee,
• Have a revision anterior cruciate ligament reconstruction,
• Having a history of knee joint arthritis (osteoarthritis, inflammatory arthritis),
• Have a neurological disease,

Patients who were underwent remnant-preserving anterior cruciate ligament reconstruction