Jean Mazeas

Background After an anterior cruciate ligament reconstruction (ACLR), mounting evidence suggests that open kinetic chain (OKC) strengthening is safe, reduces the risk of anterior knee pain, and significantly improves the quadriceps strength. However, clinicians are reluctant to use OKC knee strengthening exercises mainly due to the strong beliefs t...

Arthrogenic muscle inhibition (AMI) is a neuromuscular impairment commonly observed following anterior cruciate ligament reconstruction (ACLR). This condition, characterized by persistent quadricep inhibition due to altered afferent feedback, significantly impacts neuromuscular recovery, delaying return to running and sport. Despite advancements in...

Purpose: This study aimed to evaluate neuromuscular control and muscle activation patterns in individuals following anterior cruciate ligament (ACL) reconstruction, compared to healthy controls. Methods: A cross-sectional comparative study was conducted following STROBE guidelines, including 16 participants (ACL group: n = 9; control group: n = 7)....

Background: Injury to the anterior cruciate ligament is one of the most common knee injuries. Following anterior cruciate ligament reconstruction, strength deficits and reduced quadriceps and hamstring muscle mass are common. Traditional strengthening protocols recommend the use of heavy loads. However, following surgery, heavy-load exercises are c...

This article provides a comprehensive analysis of knee strengthening post-surgery, focusing on key performance indicators (KPIs) essential for recovery and performance enhancement. The study delves into the importance of range of motion (ROM), load management through repetitions maximum (RM) and velocity-based training (VBT), speed variations, repe...

Recurrent sports injuries present complex challenges that extend beyond the playing field, impacting athletes' physical well-being, mental resilience, and financial stability. This review outlines a comprehensive framework designed to prevent and manage these setbacks, empowering athletes to achieve sustained performance and recovery. This multidim...

(1) Background: Shoulder pathologies are mostly found in overhead sports. Many risk factors have been identified, in particular a deficit in the kinetic chain. The aim of this review was to find out whether prevention by strengthening the kinetic chain can have an impact on the rate of shoulder injury in overhead pitching athletes. (2) Methods: A s...

This article provides a comprehensive analysis of knee strengthening post-surgery, focusing on key performance indicators (KPIs) essential for recovery and performance enhancement. The study delves into the importance of range of motion (ROM), load management through repetitions maximum (RM) and velocity-based training (VBT), speed variations, repe...

Evaluating athletes is crucial for both injury prevention and performance enhancement. This editorial explores the multifaceted approach required to maintain athletes at their peak while minimizing risks. Understanding an athlete's baseline physical condition through comprehensive assessments is the first step. Regular monitoring helps detect early...

Background: Hamstring injuries are a major problem in sports involving sprinting, such as soccer, rugby, and track and field, and lead to sports stoppages and psychological, social, and financial repercussions. For several years now, these injuries have been stagnating or even increasing. Preventing these injuries is therefore a fundamental issue f...

Background: After anterior cruciate ligament reconstruction, a crucial priority is restoring knee muscle strength, especially the quadriceps, to reach the pre-injury strength levels as fast as possible. A feasible alternative to heavy loading might be blood flow restriction training that may elicit quadriceps muscle strength adaptations using low e...

Background: Sprinting is a type of running that consists of producing a short and intense effort in order to perform maximal speed in a short period of time. Sprinting is widely investigated because of the multiple and complex mechanisms involved. Sprint studies are now focusing on how to improve performance by focusing their analyses on the mechan...

Arthrogenic Muscle Inhibition (AMI) is a phenomenon observed in individuals with joint injury or pathology, characterized by a reflexive inhibition of surrounding musculature, altered neuromuscular control, and compromised functional performance. After anterior cruciate ligament reconstruction (ACLR) one of the most obvious consequences of AMI is t...

Objectives: To determine whether quadriceps and hamstring strengthening in a rehabilitation program involving early open kinetic chain (OKC) and/or closed kinetic chain (CKC) knee joint exercises had an influence on graft laxity at 1, 3, and 6 months after anterior cruciate ligament reconstruction (ACLR) Design: Retrospective study Methods: Two g...

Introduction: The main objective of this study was to evaluate whether running after anterior cruciate ligament reconstruction (ACLR) resulted in increased muscular activity of the gastrocnemius medialis and gastrocnemius lateralis compared to running in healthy participants. The secondary objective was to assess whether these changes in muscular a...

Purpose The goal of the current study was to ascertain whether there is an association between foot pronation and anterior cruciate ligament (ACL) injury in a group of elite professional soccer players. Methods Two groups of soccer players were studied, all of whom played in the Greek Super League. The ACL group included players who had suffered an...

Recent studies have shown satisfactory functional results after spontaneous healing of a ruptured anterior cruciate ligament (ACL). However, current literature on this topic may exclude important parting selection, outcome measures, and long-term results. Rehabilitation protocols applied in those studies, as well as objective assessments appear far...

Introduction: The main objective of this study was to evaluate whether running after anterior cruciate ligament reconstruction (ACLR) resulted in increased muscular activity of the gastrocnemius medialis and gastrocnemius lateralis compared to running in healthy participants. The secondary objective was to assess whether these muscular activity cha...

Total knee arthroplasty (TKA) is one of the most performed operations in the world, especially in the elderly. Aging has a significant effect on joint cartilage, muscle strength, and muscle mass. Following a TKA, despite the significant reduction of symptoms and the improvement in mobility, muscle strength and muscle mass recovery remains a signifi...

RÉSUMÉ I SUMMARY Depuis des décennies, la rupture du ligament croisé antérieur (LCA) constitue une blessure redoutée chez les jeunes joueurs de football puisqu'elle occasionne des modifi cations physiologiques et psychologiques tout en engageant des pertes économiques importantes. Grâce à la recherche clinique, la compréhension des mécanismes et l'...

RÉSUMÉ I SUMMARY La rupture du tendon d'Achille est une pathologie d'incidence croissante par l'augmentation de l'intensité des pratiques spor-tives amateurs et par la poursuite de cette pratique avec la montée en âge. La rupture fait suite à une dégradation de la matrice tendi-neuse, soit une tendinopathie dégénérative, qui n' est symptoma-tologiq...

Background: For years, the rupture of the anterior cruciate ligament (ACL) has been a feared injury in young soccer players since it causes physiological and psychological changes while incurring significant economic losses. Methods: Through clinical research, understanding the mechanisms and identifying risk factors has enabled sports and performa...

Background: The Achilles tendon rupture is a pathology of growing incidence due to the increase in the intensity of amateur sports practices and the continuation of this practice with the rise in age. The rupture follows a degradation of the tendon’s structure, known as degenerative tendinopathy, which is symptomatic only in rare cases. In the abse...

Background: During the anterior cruciate ligament reconstruction, the graft is taken from the distal hamstring tendon, which causes morphological and neurological changes in these muscles, particularly on the maximum effective angle of the knee flexors. The present study investigates changes in knee flexor following anterior cruciate ligament recon...

Background: The objective of this study is to determine whether the early association of the open kinetic chain (OKC) and the closed kinetic chain (CKC) allows an improvement in the strength and functional qualities of the quadriceps in the context of soccer rehabilitation after anterior cruciate ligament reconstruction. Materials: A collection of...

Background: Active ankle stability corresponds to the integration of sensory information to allow the modulation of the motor response and its adaptation. Among these different effects, the Kinesio-Taping could have a stabilizing effect on the joints. The purpose of this study is to determine if there is a link between the application of Kinesio-Ta...

Background: Recurrent subject, following a high recurrence rate, and increasing in recent years, hamstring injuries continue to be talked about in the world of amateur and high level sport. Methods: Through this article, it is a question of approaching the injury mechanisms and the modifiable risk factors responsible for lesions of the hamstrings a...

Background: Anterior Cruciate Ligament (ACL) tear is currently a main issue in all of sports communities. Although the number of ACL injuries in football remains low, it’s consequences on both professional and personal lives remain a major concern of rehabilitation. Methods: If practitioners often require more time to bring athletes in the best con...

Anterior Cruciate Ligament (ACL) tear is currently a main issue in all of sports communities. Although the number of ACL injuries in football remains low, it’s consequences on both professional and personal lives remain a major concern of rehabilitation. If practitioners often require more time to bring athletes in the best condition, the fact rema...

Background: Today, anterior cruciate ligament rupture is the most common injury in sportsmen and women, but it can also occur in sedentary subjects. Its treatment, always adapted to the patient's lifestyle, age, and will, often remains surgical. However, despite its frequency and universality, we still find gait disorders after the surgery and can...

Background: The optimization of this return to athletic activity passes by a better understanding of the muscle's behavior involved in knee function. In this study, we focused on the muscle's muscular activity involved in the flexion of the knee. Precisely on the relation between the gastrocnemius's muscular activity and the hamstring among the pat...

Background: Rehabilitation following an anterior cruciate ligament reconstruction (ACLR) will allow the patient to regain his functional capacities and support him in the resumption of sports activity. Rehabilitation also aims to minimize the recurrence risk, ensuring the good development of the patient’s muscular capacities until returning to spor...

Background: The optimisation of this return to athletic activity pass by a better understanding of the behaviour of the muscle involved in knee function.In this study, we focused on the muscular activity of the muscle involved in the flexion of the knee. Preciseley on the relation between the muscular activity of the gastrocnemius and the hamstring...

Today, rupture of the anterior cruciate ligament is the most common heavy injury in athletes, but it can also occur in sedentary subjects. Its treatment, always adapted to the lifestyle, age and will of the patient, often remains surgical. However, despite its frequency and universality, there are still walking disorders following the operation. Th...

Rehabilitation following anterior cruciate ligament reconstruction with hamstring graft allows the patient to regain his functional capacities and to support him in the resumption of sports activities. Rehabilitation also aims to minimize the risk of recurrence, which is why it ensures that the patient's muscular capacities develop properly until t...

Anticipation is one of the mechanisms to limit the risk of injury upon receipt of a fall by reducing impact forces. In this anticipation, the Deltoid muscle in particular plays an important role, but its activity has not been studied in this context. The purpose of this study is to investigate the anticipatory activity of the three Deltoid heads in...

Introduction: Hallux valgus is the most common condition found in the foot, caused by a progressive failure of the first ray stabilization means. The hallux is deviated into valgus, the first metatarsal into varus, and their association leads to a subluxation of the metatarsophalangeal joint of the first ray. Surgery is a treatment frequently used...

The biomechanical models are evolving in order to be as close as possible to the clinic. Quantified movement analysis offers predictive and / or functional methods that help determine and model functional axes known as helical axes that seem today to represent the means closest to human joint movement. The knee is a joint with complex movements sub...

The Quantified Motion Analysis (QMA) has become in recent years a clinical examination whose understanding and improvement are being developed. Based on a three-dimensional projection of the body segments, the QMA must define these segments and their means of union, the axes and centers of articular rotation. Two main techniques exist: predictive e...

Chronic instability is a complication of the lateral ankle sprain that can be treated surgically. There is currently no objectively defined criterion to authorize the resumption of sports activities to patients who have undergone this kind of surgery. The objective of this work is to define objective criteria for returning to sport after ankle liga...

Vision is one of the main systems used to control movement and posture. However, ACL injury can lead to changes in motor control which can then entail risks which compromise the chances of patients having undergone ACL reconstruction to return to competition. Current data from the international literature highlight postural disorders associated wit...

Background: the deformation of the hallux into a valgus constitutes the most frequent deformation of the forefoot and one of the most performed corrective surgeries in the region. This deformation is the cause of many biomechanical disorders and causes gait disturbances. This review aims to analyze the restoration of space-time and kinematic parame...

Background: the deformation of the hallux into a valgus constitutes the most frequent deformation of the forefoot and one of the most performed corrective surgeries in the region. is deformation is the cause of many biomechanical disorders and causes gait disturbances. is review aims to analyze the restoration of space-time and kinematic parameters...

Background: The anterior cruciate ligament (ACL) tear is the most common sports injury. Surgery is often proposed, but single-leg and double-leg static postural disorders have been discovered several months after surgery. Our aims are to compare postural disorders after ligament reconstruction by hamstring tendon graft in the three months after sur...

Introduction: e anterior cruciate ligament (ACL) tear is the most common sport injury. Surgery is o en proposed, but single-leg and double-leg static postural disorders have been discovered several months a er surgery. Our aims are to compare postural disorders a er ligament reconstruction by hamstring tendon gra in the 3 months a er surgery to tho...