Abstract The objective of this work consists studying the feasibility to impose descending stair negotiation in UGent Knee Rig (UGKR). force and position reference signals for control strategy are derived from literature. A mathematical coordinate transformation is developed make descent possible within limitations UGKR. Kinematic measurements six degrees freedom knee joint allow assess instabi...

Patellofemoral instability is related to anatomy. Magnetic resonance imaging (MRI) provides anatomic detail, but spoiled gradient echo (SPGR) imaging during isometric quadriceps contraction provides objective functional data for diagnosing patellofemoral laxity. Knee MRI studies and medical charts of 398 patients were retrospectively reviewed. Two independent blinded observers evaluated the kne...

In this paper, we present a novel visualization approach for the quantitative analysis of knee movement patterns in time-varying data sets. The presented approach has been developed for the analysis of patello-femoral instability, which is a common knee problem, caused by the abnormal movement of the patella (kneecap). Currently, patello-femoral analysis is based on acquisitions performed durin...

Objectives: Background: Patellofemoral joint instability is common in young athletes and often requires surgical intervention. Incidence risk factors for ipsilateral recurrence have been more discussed the literature than contralateral events. Purpose: To evaluate incidence patellofemoral patients who undergone patellar stabilization surgery. Methods: This retrospective study included 543 had m...

A rupture of the anterior cruciate ligament (ACL) usually leads to an altered stretch reflex excitability of the thigh muscles that stabilize the knee. The purpose of this study was to quantitatively assess reflex activity in the m. semitendinosus/semimembranosus after anterior tibial translation in 21 patients with isolated ACL ruptures. The patients were divided into a group with "giving way"...

INTRODUCTION Prophylactic gastrocnemius flap with primary rotating hinge knee is technically demanding in a case of neglected post-traumatic, infective arthritis of the knee, with challenges of compromised skin and soft tissues, articular bone defect, limb mal-alignment, gross instability, retained hardware and a contracted extensor mechanism with the patella fixed in the lateral gutter all in ...

Knee joint instability is frequently reported by patients with knee osteoarthritis (KOA). Objective metrics to assess are lacking, making it difficult target therapies aiming improve stability. Therefore, the aim of this study was compare responses in neuromechanics perturbations during gait self-reported (KOA-I) versus reporting stable knees (KOA-S) and healthy control subjects. Forty (20 KOA-...

Ligament balancing affects many of the postoperative criteria for a successful knee replacement. A balanced knee contributes to improved alignment and stability. Ligament balancing helps reduce wear and loosening of the joint. A patient with a balanced knee is more likely to have increased range of motion and proprioception, and decreased pain. All these factors help minimize the need for revis...

INTRODUCTION A deleterious relationship between knee osteoarthritis (OA) and standing balance has been well established. Hassan et al. (2001), report knee OA patients with increased body sway during quiet standing relative to control. Static stability impairments are thought to be the result of proprioceptive deficits, muscle weakness, and knee pain brought about by the articular degeneration o...