Bone cysts at the meniscal attachment are associated with a longer symptom duration among patients with arthroscopically treated medial meniscus posterior root tear.

Purpose: To elucidate the features of bone cysts at attachment sites of medial meniscus posterior root tears (MMPRTs).

Methods: Knees treated using arthroscopic surgery for MMPRT between 2015 and 2022 were retrospectively reviewed. Patients without a memory of onset (painful popping), prior knee surgeries, concomitant ligament or meniscus injuries or fractures were excluded.

Arthroscopic pullout repair versus suture anchor repair for medial meniscus posterior root tear combined with high tibial osteotomy.

Background: The aim of this study was to compare the outcomes of pullout repair with a metal button and suture anchor repair for medial meniscus posterior root tears in patients undergoing high tibial osteotomy with varus alignment.

Methods: Patients who underwent arthroscopic pullout repair (P group) and suture anchor repair (SA group) in combination with open-wedge high tibial osteotomy between 2018 and 2021 were retrospectively examined. Patients who received second-look arthroscopy at 1 year and at least 2 years of follow up were included.

Insufficient restoration of meniscal extrusion by transtibial pullout repair for medial meniscus posterior root tears.

Purpose: The long-term changes in the dynamics of the medial meniscus after transtibial pullout repair for medial meniscus posterior root tears (MMPRTs) are not completely understood. Thus, the aim of this study was to investigate the effects of transtibial pullout repair on MMPRTs and whether the effects would be sustained.

Methods: Nineteen knees with MMPRTs that were treated by trans-tibial pullout repair were enrolled in this study.

Increased Bone Plug Depth From the Joint Increases Tunnel Enlargement in Anterior Cruciate Ligament Reconstruction Using Bone-Patellar Tendon-Bone Autograft With Suspensory Femoral Fixation.

Purpose: To determine a safe bone plug depth fixation zone based on early tunnel enlargement rates in anterior cruciate ligament (ACL) reconstruction using bone-patellar tendon-bone (BPTB) autograft with suspensory femoral fixation.

Methods: Patients who had undergone rectangular tunnel ACL reconstruction using BPTB autograft with suspensory femoral fixation were retrospectively identified. Femoral and tibial tunnel aperture areas were measured on computed tomography 2 weeks and 6 months after surgery to calculate rates of femoral and tibial tunnel enlargement (FTE and TTE), respectively.

Evaluation of the bone tunnel position and state of healing on second-look arthroscopy after pullout repair of medial meniscus posterior root tear during open-wedge high tibial osteotomy.

Background: The aim of the present study was to evaluate the outcome of pullout repair of medial meniscus posterior root tear during open-wedge high tibial osteotomy, including the bone tunnel position and the state of healing on second-look arthroscopy.

Methods: The cohort comprised 22 patients (six men, 16 women) who underwent arthroscopic root fixation by the transtibial pullout technique for medial meniscus posterior root tear during open-wedge high tibial osteotomy. The mean patient age was 63.

Sagittal Inclination Angle of Graft Is Associated With Knee Stability After Anatomic Anterior Cruciate Ligament Reconstruction.

Purpose: To evaluate whether the sagittal inclination angle (SIA) of a graft is associated with postoperative knee stability after anatomic anterior cruciate ligament (ACL) reconstruction.

Methods: All patients who had undergone anatomic ACL reconstruction between April 2014 and September 2015 in addition to volunteers with no history of knee injury were eligible for inclusion in this study. The patients were evaluated by magnetic resonance imaging of the knee in full extension at 1 year after surgery, as were volunteers.

Association between postoperative meniscal extrusion and clinical outcomes of the pullout fixation technique for medial meniscus posterior root tear.

Objective: To evaluate the correlation between meniscal extrusion in the coronal plane with clinical and radiological outcomes at a minimum of 1 year after transtibial pullout fixation for medial meniscus posterior root tear (MMPRT).

Methods: Data from 30 patients (five males, 25 females) with MMPRT who underwent arthroscopic root fixation by the transtibial pullout technique between 2011 and January 2015 were retrospectively analyzed. The mean patient age was 60.

A steep coronal graft bending angle is associated with bone tunnel enlargement of the posterolateral bundle after anterior cruciate ligament reconstruction.

Purpose: The correlation between the graft bending angle (GBA) of the anteromedial bundle and posterolateral bundle after anterior cruciate ligament reconstruction (ACLR) and postoperative tunnel enlargement was evaluated.

Methods: Two hundred fifty-eight patients (137 males, 121 females; mean age 27.3 years) who had undergone double-bundle ACLR were included.

The relationship between the clinical results and the remnant type following anterior cruciate ligament reconstruction using a hamstring tendon.

Purpose: The aim of the present study was to investigate the correlations among the preoperative and postoperative knee laxity, the clinical results, and the type of remnant tissue following the anterior cruciate ligament (ACL) reconstruction.

Methods: One hundred ninety-two patients (male, n = 101; female, n = 91; mean age, 27.1 years) with ACL-deficient knees who had undergone double-bundle reconstruction were included.

The remnant preservation technique reduces the amount of bone tunnel enlargement following anterior cruciate ligament reconstruction.

Purpose: The aim of the present study was to investigate the correlation between postoperative tunnel enlargement after ACLR and remnant tissue preservation using the hamstring tendon.

Methods: One hundred and ninety-two subjects (male, n = 101; female, n = 91; mean age 27.1) who had undergone double-bundle ACL reconstruction were included in the present study.

Factors affecting knee laxity following anterior cruciate ligament reconstruction using a hamstring tendon.

Background: The aim of the present study was to investigate the correlation between the pre-operative and intraoperative factors that predict postoperative knee laxity following anterior cruciate ligament (ACL) reconstruction using a hamstring tendon.

Methods: The subjects included 108 patients (male, n=49; female, n=59) with ACL-deficient knees who had undergone double-bundle reconstruction. The median time between injury and surgery (TBIS) was 27.

Patient age as a preoperative factor associated with tunnel enlargement following double-bundle anterior cruciate ligament reconstruction using hamstring tendon autografts.

Purpose: A few studies have detected associations of post-operative tunnel enlargement with sex, age, and the timing of anterior cruciate ligament reconstruction (ACLR). The aim of the present study was to investigate the correlation between post-operative tunnel enlargement following ACLR using hamstring tendon autografts and preoperative factors. The authors hypothesized that tunnel enlargement is associated with age in patients undergoing ACLR.

Relationship between knee osteoarthritis and the locomotive syndrome risk tests: A cross-sectional study.

Objective: To determine the relationship between locomotive syndrome (LS) risk tests and knee osteoarthritis (KOA).

Study Design: Cross-sectional cohort study.

Methods: In 2015, 225 people (male 84, females 141, mean age 67.

Disruption of DNA Damage-Response by Propyl Gallate and 9-Aminoacridine.

The DNA-damage response (DDR) protects the genome from various types of endogenous and exogenous DNA damage, and can itself be a target of certain chemicals that give rise to chromosomal aberrations. Here, we developed a screening method to detect inhibition of Mediator of DNA damage Checkpoint 1 (MDC1) foci formation (the Enhanced Green Fluorescent Protein (EGFP)-MDC1 foci formation-inhibition assay) using EGFP-MDC1-expressing human cells. The assay identified propyl gallate (PG) and 9-aminoacridine (9-AA) as inhibitors of camptothecin (CPT)-induced MDC1 foci formation.

Relation among the knee, sagittal spinal alignment, and the spinal range of motion: Investigation in local medical check-ups using the SpinalMouse.

Background: This study was designed as an investigation in a local population to assess the relation between the knee joint and spinal alignment in a population-based study using the SpinalMouse.

Methods: Medical check-ups were conducted for residents of a mountain village in Japan. The study population included 107 men and 157 women (528 knees) with a mean age of 71.

Sonographic evaluation of the medial aspect of the knee in a population-based cohort study.

Purpose: The aim of this study was to evaluate the medial aspect of the knee with ultrasound (US).

Methods: This study included 71 men and 154 women (450 knees) with a mean age of 65 years. US was used to evaluate the medial joint space of both knees with and without weight-bearing.

Population-based study of the relationship between medial meniscus radial displacement, determined by use of ultrasound screening, and knee pain.

Purpose: The purpose of this population-based study was to clarify the incidence of knee pain by use of ultrasound (US).

Methods: Medical check-ups were conducted for residents of a mountain village in Japan. The subjects were 149 males and 252 females (802 knees) with a mean age of 63.

Assessment of Osgood-Schlatter Disease and the Skeletal Maturation of the Distal Attachment of the Patellar Tendon in Preadolescent Males.

Background: Osgood-Schlatter disease (OSD) is a traction apophysitis of the tibial tuberosity. Ultrasonography (US) is able to detect pathologic changes, such as cartilage swelling and fragmentation of the tibial tubercle ossification center.

Purpose: To compare the US stages of tibial tuberosity development and the physical features and prevalence of OSD in this patient cohort.

Morphological evaluation and diagnosis of medial type osteoarthritis of the knee using ultrasound.

Objective: The aim of this study was to diagnose osteoarthritis (OA) of the knee joint using ultrasound (US).

Methods: The study subjects included 27 males and 54 females (131 knees), who had a mean age of 62.8 years.

Influence of the anterior-posterior femoral translation on the range of motion in cruciate-retaining total knee arthroplasty.

Purpose: The purpose of this study is to evaluate the post-operative range of motion (ROM) of the knee related to the anterior-posterior femoral translation on the tibia observed during surgery in cruciate-retaining total knee arthroplasty (TKA) using a navigation system. Our hypothesis is that the intraoperative anterior-posterior femoral translation is correlated with the post-operative ROM in patients undergoing cruciate-retaining TKA.

Methods: The subjects were 20 patients involving 23 joints.

The importance of tibial tunnel placement in anatomic double-bundle anterior cruciate ligament reconstruction.

Purpose: The purposes of this study were to measure the anterior edge of the tibial tunnel after anatomic anterior cruciate ligament (ACL) reconstruction on lateral radiographs and to determine whether the difference in tibial tunnel placement affects postoperative outcomes.

Methods: For 60 patients who underwent anatomic double-bundle ACL reconstruction with semitendinosus tendon, we evaluated the side-to-side difference in anterior tibial translation on stress radiographs, as well as rotational stability by the pivot-shift test, 2 years after surgery. Loss of extension (LOE) was evaluated on lateral radiographs of both knees in full extension, and graft integrity was assessed during second-look arthroscopy 1 to 2 years after surgery.

Acute phase response of selenium status and glutathione peroxidase activity in blood plasma before and after total knee arthroplasty surgery.

Several studies show the consistent results of the decrease in plasma or serum selenium (Se) after surgery, and the change is suggested to be a negative acute phase response of Se to the surgical inflammation. Plasma glutathione peroxidase (GPx), which is included in the acute phase response proteins, is a selenoenzyme. However, previous studies failed to show any changes in GPx activity before and after surgery.

Alternation of trunk movement after arthroplasty in patients with osteoarthritis of the knee.

Objective: Trunk movement is important but still little understood after total knee arthroplasty. The alternation of trunk movement was analyzed for use in a postoperative rehabilitation program in the short-term after arthroplasty.

Materials And Methods: The subjects were 25 patients with knee osteoarthritis (4 males, 21 females).

Relationship between femoral component rotation and total knee flexion gap balance on modified axial radiographs.

Using modified axial radiographs, we investigated the relationship between femoral component rotation and flexion gap balance in 70 consecutive knees with varus osteoarthritis 1 year after they underwent cruciate-ligament-retaining total knee arthroplasty with the measured resection technique. We measured (1) the condylar twist angle, defined as the angle between the posterior condylar axis and the clinical epicondylar axis, and (2) the liftoff angle (LOA), defined as the angle between the posterior condylar axis and the tibial cutting surface. There was a significant positive correlation between the postoperative condylar twist angle (mean, 2.