Sang Hak Lee

BACKGROUND: Longitudinal tears of the medial meniscus posterior horn (MMPH) are commonly associated with a chronic anterior cruciate ligament (ACL) deficiency. Many studies have demonstrated the importance of the medial meniscus in terms of limiting the amount of anterior-posterior tibial translation in response to anterior tibial loads in ACL-deficient knees. HYPOTHESIS: An MMPH tear in an ACL-deficient knee increases the anterior-posterior tibial translation and rotatory instability. In additi

PURPOSE: To assess the long-term clinical and radiographic results of arthroscopic reshaping with or without peripheral meniscus repair for the treatment of symptomatic discoid lateral meniscus in children. METHODS: This study included 38 children (48 knees) who underwent arthroscopic surgery for symptomatic discoid lateral meniscus. The mean age at operation was 9.9 years (range, 4 to 15 years), and the mean follow-up period was 10.1 years (range, 8 to 14 years). Arthroscopic partial meniscecto

BACKGROUND: Recently, variations of the remnant bundle preservation technique, including selective bundle reconstruction and preservation of the anterior cruciate ligament tibial remnant, have produced good outcomes. The authors chose to investigate whether remnant bundle preservation in anterior cruciate ligament reconstruction would affect the remodeling process without inducing complications. HYPOTHESIS: An anterior cruciate ligament reconstruction graft can be augmented with a tensioned remn

BACKGROUND: Although cartilage regeneration after medial open-wedge high tibial osteotomy (HTO) has been described, there is a paucity of reports regarding which factors influence cartilage regeneration. PURPOSE: To document whether cartilage regeneration occurs in the previously degenerated medial compartment of arthritic knees after medial open-wedge HTO without concomitant cartilage procedures and to assess which predictive factors influence regeneration after HTO. STUDY DESIGN: Case series;

Background: The incidence of meniscocapsular junction tears of the medial meniscus posterior horn, known as ramp lesions, is reported to be 9.3% to 23.9%. However, these lesions are not consistently diagnosed with routine arthroscopic exploration and magnetic resonance imaging (MRI). Purpose: To determine risk factors associated with ramp lesions in anterior cruciate ligament–injured knees. Study Design: Cross-sectional study; Level of evidence, 3. Methods: A total of 275 patients undergoing ant

BACKGROUND: No consensus has been reached with regard to the ideal timing of anterior cruciate ligament reconstruction in terms of reducing secondary meniscal tears in anterior cruciate ligament-deficient knees. HYPOTHESIS: Delay in anterior cruciate ligament reconstruction increases the incidence and severity of medial meniscal tears. STUDY DESIGN: Case series; Level of evidence, 4. METHODS: Thirty-one patients were evaluated with arthroscopic all-inside suturing of medial meniscal tears with c

The aims of this study were to quantify the angle and placement of an anterior cruciate ligament (ACL) grafted with a single incision ACL reconstruction technique using postoperative magnetic resonance imaging (MRI), and to compare the results with those with a native ACL. Between February 1996 and May 2004, 96 consecutive patients, who had undergone postoperative MRI of the knee followed by an arthroscopically assisted ACL reconstruction with either a hamstring tendon or bone-patellar tendon-bo

PURPOSE: To document the diagnostic accuracy and steps for sequential arthroscopic exploration of ramp lesions-peripheral tear within 4 mm of meniscocapsular junction of medial meniscus-associated with anterior cruciate ligament (ACL) injury. METHODS: This was a prospective consecutive study of 195 primary ACL reconstructions with arthroscopic exploration for ramp lesion in 4 steps: (1) standard exploration through the anterolateral portal, (2) through the intercondylar space using a 30° arthros

PURPOSE: This study was undertaken to document the clinical results of arthroscopic meniscus repair for treatment of displaced bucket-handle tears of the lateral meniscus. METHODS: From 2002 to 2010, 13 patients with symptomatic displaced bucket-handle tears of the lateral meniscus treated by arthroscopic meniscus repair were included in this study. Inclusion criteria were (1) displaced bucket-handle tear of the lateral meniscus demonstrated on magnetic resonance imaging, (2) non-discoid lateral

PURPOSE: The objective of this prospective randomized controlled trial was to assess the efficacy and safety of simultaneous application of tranexamic acid and indirect factor Xa inhibitor following total knee arthroplasty (TKA). METHODS: Seventy-two primary osteoarthritis patients undergoing unilateral TKA using fondaparinux as a basic thromboprophylaxis were randomized to receive either placebo (36 patients) or tranexamic acid (36 patients). Prophylaxis against venous thromboembolism in all pa

PURPOSE: The aim of this study was to analyze, by use of magnetic resonance imaging (MRI), the contralateral discoid lateral meniscus (DLM) status of 33 patients who underwent an operation for a symptomatic DLM. METHODS: This diagnostic study included 33 consecutive patients who underwent arthroscopic surgery for a unilaterally symptomatic DLM. All patients' contralateral knees were checked with simple radiographs and MRI scans. Knees were also evaluated through physical examinations and a clini

If posterolateral rotatory instability (PLRI) injury in patients with a torn anterior cruciate ligament (ACL) is not diagnosed and treated, ACL reconstruction can fail. We retrospectively evaluated the clinical outcome after reconstructions between 2002 and 2007 of both the ACL and the posterolateral corner (PLC) in 44 knees with combined ACL and PLC injuries. The median follow-up duration was 49 months (range, 24-68 months). ACL reconstruction employed autogenous hamstring grafts from the ipsil

In the treatment of patients with popliteal cysts (Baker's cysts), we generally need to address the intra-articular pathologies, most commonly, medial meniscal tears and concomitant connecting valvular mechanisms responsible for the formation and recurrence of the cyst. We introduce here an arthroscopic technique that can treat the associated intra-articular pathology and correct the valvular mechanism of the capsular fold. The most important step is to locate the opening connection between the

PURPOSE: The purpose of this study was to evaluate the clinical and radiographic results of open wedge HTO below the tubercle for genu varum in relatively young patients. METHODS: Thirty-seven knees in 19 patients with genu varum treated by open wedge HTO below the tubercle between 2001 and 2008 were retrospectively studied. Median follow-up was 36 months (12-108), and median patient age at the time of surgery was 26 years (16-45). Clinical results were evaluated using Lysholm knee scores and Ho

PURPOSE: This study examined the functional and magnetic resonance imaging (MRI) outcomes of popliteal cysts with combined intra-articular pathologies that were treated arthroscopically by decompression and a cystectomy through an additional posteromedial cystic portal. METHODS: From January 2003 to March 2008, 31 patients were treated with a modified arthroscopic technique to decompress a popliteal cyst. The connecting valvular mechanism was found in all cases at the posteromedial compartment t