Extent of vertical cementing as a predictive factor for radiolucency in revision total knee arthroplasty.

Purpose: Limited information is available regarding the effects of cementing extent on implant stability in patients who have undergone revision total knee arthroplasty (TKA). As such, the goals of this study were: (1) to determine the correlation between the extent of vertical cementing and implant loosening; (2) to determine whether the extent of cementing is a potential predictive factor for radiolucency; and (3) to evaluate the minimal amount of cement needed for a stable implant during revision TKA using a hybrid technique.

Methods: One hundred nine stemmed/revision TKAs with a mean follow-up period of 5 years were retrospectively analysed.

Comparison of patellar resurfacing versus preservation in high flexion total knee arthroplasty.

Purpose: Recently, high flexion design total knee arthroplasty (TKA) has been introduced to improve clinical outcomes. The purpose of this study is to compare the midterm outcomes between patellar resurfacing (PR) and patellar preservation (PP) in high flexion TKA.

Methods: A total of 373 knees of primary TKAs were performed using high flexion design, 339 knees involved PR group and 34 knees involved PP group.

Can physical examination predict the intraarticular tear pattern of the anterior cruciate ligament?

Purpose: We evaluated the correlation between physical examinations and the tear patterns of the anterior cruciate ligament (ACL).

Materials And Methods: From January 2003 to May 2007, we reviewed 201 cases of ACL rupture, diagnosed by MRI. Two orthopaedic surgeons (a fellow and a senior surgeon) evaluated the instability of the knee under anaesthesia: physical examinations were the anterior draw test (AD), Lachman test (LT), and pivot shift test (PT).

Meniscus allograft transplantation for discoid lateral meniscus: clinical comparison between discoid lateral meniscus and nondiscoid lateral meniscus.

Purpose: This study was performed to compare the clinical results of meniscus allograft transplantation (MAT) after total meniscectomy in torn discoid lateral meniscus (DLM) and nondiscoid lateral meniscus (NLM).

Methods: We conducted a retrospective study of 36 patients who underwent MAT. The discoid and nondiscoid groups consisted of 16 and 20 patients, respectively.

Meniscus allograft transplantation: a comparison of medial and lateral procedures.

Background: Because of the anatomic and biomechanical differences between the lateral and medial menisci, it is believed that the indications, combined injuries, techniques, and outcomes of the 2 meniscus allograft transplantation (MAT) procedures may be different.

Hypothesis: Medial meniscus transplantation (medial group) usually combines concomitant surgeries, such as anterior cruciate ligament (ACL) reconstruction, so the medial group will have worse clinical results than the lateral group (lateral meniscus transplantation).

Study Design: Cohort study; Level of evidence, 3.

Comparison of clinical results of anatomic posterolateral corner reconstruction for posterolateral rotatory instability of the knee with or without popliteal tendon reconstruction.

Background: It is unknown whether popliteal tendon reconstruction is necessary in anatomic posterolateral corner reconstruction, although the tendon has function in the varus and rotatory stability of the knee joint.

Hypothesis: Anatomic reconstructions of the posterolateral corner with the popliteal tendon reconstructed will present better clinical and radiographic results than cases with the popliteal tendon not reconstructed.

Study Design: Cohort study; Level of evidence, 3.