Shortening of
An understanding of the remodelling of tendon is crucial for the development of scientific methods of treatment and rehabilitation. This study tested the hypothesis that tendon adapts structurally in response to changes in functional loading. A novel model allowed manipulation of the mechanical environment of the
Introduction:
We compared the biological characteristics of extrinsic fibroblasts infiltrating the
Introduction: Anterior cruciate ligament (ACL) rupture impairs knee stability. Reconstruction of the ACL is therefore performed to restore knee stability and avert risk of subsequent ligament and meniscal injury. Bone-patellar tendon-bone autograft is the most commonly employed technique for ACL reconstruction and considered the “gold standard”. Although 10% postoperative
Introduction: Patients with neglected
Purpose of study. To study the effect of different shoes and orthotics have on
In order to clarify the role of cytokines in the remodelling of the grafted tendon for ligament reconstruction we compared the responses to interleukin (IL)-1β, platelet-derived growth factor (PDGF)-BB and transforming growth factor (TGF)-β1 of extrinsic fibroblasts infiltrating the frozen-thawed
We performed a biomechanical and histological study to clarify the effect of stress enhancement on the in situ frozen-thawed
Obesity decreases
Abstract. Objectives. The need for gender specific knee arthroplasty is debated. This research aimed to establish whether gender differences in
Two men, aged 21 and 50 years, were seen with ossification of the
Tendons and ligaments are similar in composition but differ in function. Simple anatomical definitions do not reflect the fact individual tendons and ligaments have unique properties due to their adaptation to a specific role. The
We studied changes in
We describe a new method for reconstructing the
Patella infera can cause knee pain and lead to patellofemoral osteoarthritis. Treatment is usually unsatisfactory. We describe a case of severe patella infera after operative treatment for fracture of the patella. We used Ilizarov external fixation and gradual lengthening of the
Aims: To evaluate the morphologic changes in the
Introduction: Patello-femoral instability (PFI) and pain may be caused by anatomical abnormality. Many radiographic measurements have been used to describe the shape and position of the patella and femoral trochlea. Some are difficult to apply when dysplasia is present. This paper describes a simple new MRI measurement of the axial
Objective: The aim of this study was to compare different
Patella infera may occur after reconstruction of the anterior cruciate ligament (ACL), high tibial osteotomy and total knee replacement (TKR). Restriction of movement of the knee and pain may result. Our aim was to compare the incidence and to assess the effects of patella infera after TKR and unicompartmental knee replacement (UKR). We reviewed radiographs of the knees of 84 patients who had had either TKR or UKR as part of a randomised, controlled trial. The length of the
Purpose of the study: The issue of which graft to choose for anterior cruciate ligament (ACL) reconstruction is still a matter of debate. An analysis of the literature reveals the difficulty encountered when performing comparative trials. It is also difficult to demonstrate significant differences with results obtained with an insufficient number of patients. We propose here a meta-analysis in order to combine the results obtained with different comparative studies. Material and methods: The literature search (Medline 1990–2005) was based on the following selection criteria: ACL reconstruction,
INTRODUCTION.
As treatments of knee osteoarthrosis are continually refined, increasingly sophisticated methods of evaluating their biomechanical function are required. Whilst TKA shows good preoperative pain relief and survivorship, functional outcomes are sub-optimal, and research focus has shifted towards their improvement. Restoration of physiological function is a common design goal that relies on clear, detailed descriptions of native biomechanics. Historical simplifications of true biomechanisms, for example sagittal plane approximation of knee kinematics, are becoming progressively less suitable for evaluation of new technologies. The
Introduction: Patello-femoral instability (PFI) and pain may be caused by anatomical abnormality. Many radiographic measurements have been used to describe the shape and position of the patella and femoral trochlea. This paper describes a simple new MRI measurement of the axial
Patello-femoral instability (PFI) and pain may be caused by anatomical abnormality. Many radiographic measurements have been used to describe the shape and position of the patella and femoral trochlea. This paper describes a simple new MRI measurement of the axial
Introduction and Aims: We present the preliminary results of
It appears that double bundle anterior cruciate ligament reconstruction can reproduce the original anatomy of the ligament, restoring normal kinematics and rotational control of the tibia. But an anatomical single bundle reconstruction may present very similar results, with minor technical difficulties and lower costs. We compared two groups of 25 patients each, that underwent ACL reconstruction by the same surgeon, with a follow-up of 12–36 months. One group had double bundle reconstruction with hamstring and the other had single bundle anatomical reconstruction with
Purpose: This study sought to compare clinical outcomes and return to activity in high-demand patients following ACL reconstruction with either autograft or allograft
The February 2023 Knee Roundup. 360. looks at: Machine-learning models: are all complications predictable?; Positive cultures can be safely ignored in revision arthroplasty patients that do not meet the 2018 International Consensus Meeting Criteria; Spinal versus general anaesthesia in contemporary primary total knee arthroplasty; Preoperative pain and early arthritis are associated with poor outcomes in total knee arthroplasty; Risk factors for infection and revision surgery following
Purpose of the study: For medial osteoarthritis with chronic anterior laxity, we propose an original technique combining subtraction osteotomy and extra-articular ligmentoplasty using the lateral quarter of the
Purpose: Patellar tendonitis (i.e. jumper’s knee) commonly affects young adult athletes who use their knee extensor mechanism in a repetitive and/or intense manner, such as in basketball and volleyball. There is a small but significant percentage of patients with persistent symptoms despite at least a six-month course of conservative management. For these patients, we perform knee arthroscopy and open
Purpose of the study: to prospectively evaluate if day surgery influences post-operative rehabilitation time in sportsmen. Material and Methods. 122 young sportsmen underwent a reconstruction of the ACL with
Introduction. Tendon injuries remain challenging, secondary healing and prolonged immobilisation result in suboptimal outcome. Previous study by our group showed that demineralised bone matrix (DBM) can result in faster healing of a tendon enthesis. The aim of this study is to test different ways augmenting tendon with DBM to enhance tendon repair and regeneration. Methods. DBM strips were prepared from tibias of mature ewes. Patella,
Aim: To determine the short to mid-term outcome differences between
Ligamentoplasty resorting to autogenous bone-tendon-bone grafts represents an effective long-lasting remedy to the anterior instability of the knee. If this indication has proved effective regarding the stability, the sampling of a piece of the extensor system often brings about a certain morbidity. Various approaches have been advocated concerning the tendinous site: some leave it open, others suture one of the peripheral thirds of the remaining tendon to the other. These various technical choices are likely to alter the morbidity and the patellar level, together with the tissue nature of the site of sampling. The purpose of this study was to assess the effect of the suture of the site of sampling on the patellar level, after a ligament plastic surgery resorting to a bone-tendon-bone graft. To this end, a group of 40 patients whose tendinous site of sampling had been left open was compared to another group of patients whose peripheral thirds of the remaining
We have reviewed 40 patients after replacement of a ruptured anterior cruciate ligament with a free graft of the medial third of the
At the time of publication sixty-three additional patients have been fitted with the
Introduction and Aims: Some authors have suggested that, in females, the results of ACL reconstruction using hamstring tendon (HS) grafts are inferior to those using
We performed MRI on 16 patients who had had reconstruction of the anterior cruciate ligament (ACL) with a mid-third bone-patellar-tendon-bone autograft. Our aim was to assess the tendon and the site of its insertion at an average of seven years after the original operation. In four of these patients biopsies were taken from the donor site when they had revision of their original operation. MRI showed reconstitution of the tendon into the patellar defect with no evidence of bone formation. Six patients had a persistent defect in the
Purpose: Free
In the last few years the number of women who practise sport activities has substantially increased and this has led to an increase in the incidence of ACL tear in females. The aim of this study is to assess outcome differences at a minimum 3-year follow-up after ACL reconstruction in women using either a
Purpose of the study: The debate continues on the appropriate tendon to use for anterior cruciate ligament (ACL) reconstruction. There are few comparative data on the different types of grafting material. We propose a retrospective analysis of bilateral ACL reconstruction where a
Purpose: The aim of this study was to document donor site problems one year after anterior cruciate ligament (ACL) reconstruction and to compare the differencies between hamstring and patellar tendon autografts. Materilas and Methods: Sixty-four patients undergoing primary arthroscopically ACL reconstruction were randomized to have a central third bone
This investigation of elite male collegiate basketball players aims to determine 1) the change in 3D dynamic functional variables across a single season and 2) correlate cross-season changes in functional variables with changes in clinical and quantitative ultrasound measures. Eleven male college basketball players (mean age 19, range 18–21 years) from a single team underwent baseline
The patella tendon (PT) is commonly used as a graft material for anterior cruciate ligament reconstruction (ACLR). The function of the graft is to restore the mechanical behaviour of the knee joint. Therefore, it is essential that a robust methodology be developed for the mechanical testing of the PT, as well as for the tissue engineered grafts derived from this tissue. Our objectives were to (1) survey the literature, in order to define the state-of-the-art in mechanical testing of the PT, highlighting the most commonly used testing protocols, and (2) conduct validation studies using porcine PT to compare the mechanical measurements obtained using different methodological approaches. A PubMed search was performed using a boolean search term to identify publications consisting of PT tensile testing, and limited to records published in the past ten years (2010–2020). This returned a total of 143 publications. A meta-analysis was undertaken to quantify the frequency of commonly used protocol variations (pre-conditioning regime, strain rates, maximum strain, etc.). Validation studies were performed on porcine PT (n=4) using Instron tensile testing apparatus to examine the effect of preconditioning on low-strain (toe-region) mechanical properties.Abstract
Objectives
Methods
Introduction. The low-contact stress (LCS) knee prosthesis is a mobile-bearing design with modifications to the tibial component that allow for meniscal-bearing (MB) or rotating-platform (RP). The MB design had nonconstrained anteroposterior and rotational movement, and the RP design has only nonconstrained rotational movement. The anterior soft tissues, including
The aim of this longitudinal study is to compare the clinical outcomes of endoscopic ACL reconstruction with either a 4-strand HT or PT autograft over a 5-year period. 90 patients with isolated ACL rupture received PT autograft and 90 received HT autograft were studied annually for 5 years. Assessment included the IKDC Knee Ligament Evaluation, KT1000, Lysholm Knee Score, thigh atrophy, kneeling pain, hamstring pain and radiographs. The median Lysholm Knee Score was 96 for the PT group and 95 for the HT group. No significant difference was found for subjective knee function, overall IKDC assessment, Xray findings, manual ligament KT1000 instrumented testing, graft rupture or contralateral ACL rupture. There was an increasing incidence of fixed flex-ion deformity seen in the PT group. There was no difference in the requirement for subsequent surgery. The incidence of kneeling pain at 5 years was significantly higher in the PT group. Endoscopic reconstruction of the ACL utilizing either autograft can restore knee stability and is menisco protective despite a high level of sporting activity. We did find a worrying trend towards an increasing incidence of fixed flexion deformity with time in the
Purpose: The optimal autograft choice for ACL reconstruction remains controversial. Twelve recently published reviews comparing
We performed a clinical, instrumental and radiographic study on a highly homogeneous series of 100 consecutive patients with unilateral ACL lesion at 7 years of minimum follow up, alternatively assigned to a single bundle reconstruction using
Purpose of the study: The objective was to compare the results of ligamentoplasties with two commonly used grafts, hamstring and