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Background The purpose of this study was to evaluate the influence of posterior medial corner (PMC) injuries on clinical outcome and second-look arthroscopic findings after anterior cruciate ligament (ACL) reconstruction. Methods Seventy-eight consecutive patients underwent a second-look arthroscopic surgery after ACL reconstruction and magnetic resonance imaging (MRI) examination of the PMC. The patients were divided into a PMC intact group ( n = 42) and a PMC injured group ( n = 36). The stability and clinical outcomes were evaluated using the Lachman test, pivot-shift test, a KT-2000 arthrometer, and the Lysholm knee scoring scale. Graft tension and synovial coverage were evaluated in second-look arthroscopy. Results The clinical function showed no significant differences regarding PMC injury. Although the graft tendon tension revealed no significant differences ( p = 0.141), the second-look arthroscopic findings indicated that the PMC intact group showed better synovial coverage compared to the PMC injured group ( p = 0.012). Conclusion Patients who injured the PMC had poor synovial coverage as assessed by second-look arthroscopic findings after transtibial ACL reconstruction, even though clinical outcomes and stability showed no significant differences.

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Glomus tumor is a kind of hemangioma that occurs at the glomerulus in the subcutaneous layer. It mainly occurs at the distal hand and subungual area, and rarely at the knee joint. Pain, tenderness, and cold intolerance are known symptoms; however, symptoms in practice are not so easily detectable, and the diagnosis can be delayed if it is presented at areas other than the hand. If the diagnosis is delayed, patients could suffer extreme pain. Therefore, early diagnosis and surgical treatment are important. Ultrasound and magnetic resonance imaging were used to diagnose glomus tumor in our cases, which were found in subcutaneous tissue and muscle fascia. We claim that, for patients with persistent pain, known symptoms-extreme pain, cold intolerance, and tenderness-should be examined carefully and rule out glomus tumor. We report 2 cases of glomus tumors around the knee joint, which is not a common location of occurrence.