Is end-stage lateral osteoarthritic knee always valgus? Mechanical alignment analysis and radiographic severity assessment.

Background: We hypothesized that not all persons with end-stage lateral osteoarthritis (OA) have valgus malalignment and that full extension radiographs may underreport radiographic disease severity. The purpose of this study was to examine the demographic and radiographic features of end-stage lateral compartment knee OA.

Materials And Methods: We retrospectively studied 133 knees in 113 patients who had undergone total knee arthroplasty between June 2008 and August 2010.

The paradoxical McMurray test for the detection of meniscal tears: an arthroscopic study of mechanisms, types, and accuracy.

Background: Meniscal tears are very common. The so-called paradoxical McMurray test has been described and found to be positive for three different types of meniscal tears. However, to our knowledge, no study has evaluated the accuracy of this test.

An early sign of intraarticular fracture of the lateral tibial plateau during opening wedge high tibial osteotomy.

Intraarticular fracture of the lateral tibial plateau is one of the serious complications in medial opening wedge high tibial osteotomy (HTO). We present a case of fracture of the lateral tibial plateau during medial opening wedge HTO. The authors have found the early fracture sign, uneven divergence gap of proximal and distal parts during enlargement of the osteotomy site with a dilatator, a useful marker for early detection and prevention of fracture extending.

Risk factors for medial meniscus posterior root tear.

Background: Medial meniscus posterior root tears (MMPRT) have a different clinical effect from other types of meniscal tears. These tears are very common among Asian people and may be related to the frequent use of postures such as the lotus position or squatting.

Purpose: The present study was designed to identify the risk factors for MMPRT among an Asian sample.

The influence of posterolateral rotatory instability on ACL reconstruction: comparison between isolated ACL reconstruction and ACL reconstruction combined with posterolateral corner reconstruction.

Background: The purpose of the present retrospective study was to evaluate the influence of posterolateral corner reconstruction on anterior cruciate ligament (ACL) reconstruction in terms of anterior laxity and clinical outcomes. We hypothesized that the effects of combined ACL and posterolateral corner reconstruction would be less satisfactory than those of isolated ACL reconstruction in terms of anterior laxity and clinical outcomes.

Methods: We retrospectively studied sixty-nine patients who underwent ACL reconstruction from February 2001 to December 2005.

Clinical comparison of conventional and remnant-preserving transtibial single-bundle posterior cruciate ligament reconstruction combined with posterolateral corner reconstruction.

Background: Despite persistent continuity of the attenuated posterior cruciate ligament (PCL) in most PCL insufficient knees, few reconstruction techniques that preserve the PCL remnant have been presented. Furthermore, data regarding the clinical outcomes of these approaches are even more limited, and the clinical validity of remnant preservation has not yet been established.

Purpose: To compare the clinical outcomes of transtibial PCL reconstructions that incorporate remnant preservation with conventional techniques (in which remnant preservation is not performed).

Does physiologic posterolateral laxity influence clinical outcomes of anterior cruciate ligament reconstruction?

Background: The purpose of this retrospective study was to evaluate the influence of physiologic posterolateral rotatory laxity on anterior cruciate ligament (ACL) reconstruction in terms of anterior knee stability and clinical outcomes.

Methods: We retrospectively studied 113 patients who had undergone ACL reconstruction between June 2004 and August 2008. Patients were categorized into three groups according to the degree of tibial external rotation at 90° of knee flexion: Group 1 (<40°), Group 2 (40° to 50°), and Group 3 (≥50°).