OBJECTIVE To investigate which structural MR abnormalities discriminate symptomatic knee osteoarthritis (OA), taking co-occurrence of abnormalities in all compartments into account. METHODS The Netherlands Epidemiology of Obesity (NEO) study is a population-based cohort aged 45-65 years. In 1285 participants (median age 56 years, 55% women, median body mass index (BMI) 30 kg/m(2)), MRI of the...

OBJECTIVE To explore the different influences of walking, running and stair activity on knee articular cartilage with T1 rho and T2 mapping sequences. MATERIALS AND METHODS MRI (3.0-T) scans of the right knee were performed in twenty-three young healthy adults immediately after 30 minutes of rest, walking, running and stair activity respectively. Articular cartilage was quantitatively assesse...

Knee contact pressure is a crucial factor in the knee rehabilitation programs. Although contact pressure can be estimated using finite element analysis, this approach is generally time-consuming and does not satisfy the real-time requirements of a clinical set-up. Therefore, a real-time surrogate method to estimate the contact pressure would be advantageous. This study implemented a novel compu...

The effects of advancement of the tibial tuberosity by inserting bony wedges was studied on cadaveric specimens of the knee. The geometry, the contact areas and the forces acting on the patellofemoral joint were investigated, and the forces acting on the tibiofemoral compartment were calculated. A 1 cm advancement was found to be optimal in reducing the high patellofemoral joint forces occurrin...

Varus and valgus joint laxity of the normal living knee in flexion was assessed using MRI. Twenty knees were flexed to 90 degrees and were imaged in neutral and under a varus-valgus stress in an open MRI system. The configuration of the tibiofemoral joint gap was studied in slices which crossed the epicondyles of the femur. When a varus stress was applied, the lateral joint gap opened by 6.7 +/...

INTRODUCTION: A successful surgical outcome in total knee arthroplasty (TKA) depends on multiple factors, including proper rotational and translational alignment of the femoral and tibial components. Small variation in surgical alignment of an implant could potentially have a large impact on knee performance. Several authors have studied the effects of tibial and femoral component’s internal-ex...

Knee osteoarthritis (OA) is the most common form of arthritis, and affects approximately one-third of the elderly population. The medial tibiofemoral compartment is most commonly involved. This is due, in part, to the ground reaction force vector passing medial to the knee joint center during gait. This distance increases with genu varus malalignment, resulting in an increased external adductio...

We measured the pressure distribution across the tibiofemoral and patellofemoral joints during total knee arthroplasty (TKA) using Fuji pressure-sensitive film (Prescale) in 51 patients (63 joints) comparing the results with those in 21 patients in whom Prescale was not used. We classified the stress-distribution patterns in the tibiofemoral joints into four types: normal, varus-valgus instabil...

The primary aim of this study is to document whether patellofemoral arthroplasty is a good treatment option for patellofemoral osteoarthritis and to identify prognostic outcome factors. Secondary aim is to investigate the influence of preoperative tibiofemoral osteoarthritis on the clinical outcome. From 2004 to 2010, 37 Avon patellofemoral prostheses were implanted in 32 patients. Clinical out...