Objectives: This study evaluates the effect of tibial stump mechanoreceptor preservation on proprioception, muscle strength, recovery and functional outcomes after arthroscopic anterior cruciate ligament surgery (ACLS). Methods: Patients undergoing ACLS between January-July 2019 were evaluated by a single surgeon. The HUMAC NORM 2 device measured patients' proprioceptive sensation and muscle strength before and after surgery; KOOS and Oxford scales were used to score patients’ functional results. The patients were divided into two groups: those who underwent stump-preserving surgery (SP group) and those who underwent conventional surgery (C group). Results: Our study evaluated 27 patients, 11 in the SP and 16 in the C groups. The two groups had no statistical difference in muscle strength, proprioception, and functional scores in the first and third postoperative months. In the sixth-month evaluation, significantly better functional scores were found in the C group. Further, the athletic function was better in patients with good proprioception recovery, regardless of the group comparison. Conclusions: Preserving the stump and mechanoreceptors on the tibial face was not determined to provide additional benefit to the patients in the first six months after surgery. Returning to sports was faster and functional scores were better in patients with good proprioception recovery.

Objectives: The medial collateral ligament (MCL), one of the main stabilizers of the knee, is also the most injured ligament of the knee. Isolated MCL injuries are common in young men who play contact sports. It was hypothesized that MCL rupture in professional athletes develops with a specific injury mechanism. Furthermore, body posture at the time of injury varies in different sports. Materials and Methods: On May 15, 2021, “knee medial collateral injury” and “MCL injury” were entered in a YouTube^® search. The inclusion criteria were to verify that the video was compatible with the injury, that the video included the foot, ankle, knee, hip, and the whole body at the time of injury, and that image quality was sufficient to detect the mentioned body parts. Exclusion criteria were non-MCL knee injuries, insufficient images, poor video quality, and additional injuries with MCL. Results: Of the 23 injuries included in the study, 22 (95.7%) were male and 1 was female (4.3%). The distribution of activities in which injuries occurred was seven basketball (30.4%), four American football (17.4%), four ice hockey (17.4%), three soccer (13.0%) one water ski (4.3%), one skateboard (4.3%), two-track and field (8.6%), and one wrestling (4.3%). In 18 cases (78.3%), the injury occurred by contact. Of these, 16 were caused by direct contact (69.6%) and two by indirect contact (8.7%). Conclusion: Isolated MCL injury occurs when valgus force is applied with the trunk flexed and turned towards the injured side, the hip abducted and slightly flexed, and the knee slightly flexed. The majority of these cases occur after a direct blow to the lateral knee.