# Background/Purpose Anterior cruciate ligament reconstruction (ACLR) often leads to persistent neuromuscular deficits, complicating return-to-sport decisions. Reliable functional assessments are needed to guide RTS after ACLR. The main objective was to examine countermovement jump (CMJ) measures to identify which parameters can best distinguish between ACLR and control participants. The secondary objective was to determine whether performance alterations between operated and non-operated limb exist during CMJ after ACLR. # Design Non-randomized, single blinded, cross-sectional study # Methods Limb symmetry index (LSI) was calculated for vertical ground reaction force (vGRF), maximal power (MP), and eccentric rate of force development (RFDe) during countermovement jumps (CMJ) performed on force plates by an ACLR group (n=64) and a control group (n=47). First analysis compared LSI vGRF, LSI MP and LSI RFDe between groups. Secondary analysis compared vGRF, MP and RFDe between the operated/non-operated limb in the ACLR group and dominant/non-dominant limb in the control group. Between-group comparisons were made using Mann-Whitney tests due to non-normal data distribution. Effect sizes were calculated to assess the magnitude of differences. # Results Participants included 64 ACLR patients (mean age 26.5 ± 5.0 years; 33 females) and 47 controls (mean age 23.6 ± 2.1 years; 24 females). CMJ measures in the ACLR group were significantly reduced for LSI vGRF (p < 0.001), LSI MP (p < 0.001) and LSI RFDe (p < 0.001). The ACLR group exhibited significant differences between both limbs in terms of vGRF (p < 0.001), MP ( p < 0.001), and RFDe (p < 0.01). No significant limb differences were found in the control group. # Conclusion Measures of deceleration from the CMJ are altered after ACLR and should be considered throughout rehabilitation. # Level of Evidence 3

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 that they might increase graft laxity. The objective of this scoping review is to identify the key criteria employed in the scientific literature for the safe introduction of OKC quadriceps strengthening following ACLR. A scoping review of the literature was conducted on the online databases MEDLINE (PubMed), ScienceDirect, Embase and CINAHL Library online. Data regarding time-based criteria and/or clinical based criteria allowing OKC exercises introduction following ACLR were searched for. Only studies involving patients who performed quadriceps strengthening using any type of OKC exercises were included, regardless of the type, resistance location, load magnitude, type of muscle contraction, knee range of motion, or duration of the strengthening protocol. Twenty-six studies met the inclusion criteria. Twenty-one employed time-based criteria for the introduction of OKC exercise. The median time from when OKC was permitted was 15 postoperative days (range 1–270 days), while the mean time was 31.6 ± 56.7 postoperative days. In 30.7

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 groups (n = 53) of ACLR patients (combination of OKC and CKC exercises group compared to a CKC exercise group) were recruited. OKC protocol was introduced at 2 weeks post-operatively without external resistance and progressed at 4 weeks with load. Comparative ACL graft laxity measurement and isokinetic strength testing were prospectively performed up to 6 months in both groups.RESULTS:No significant differences were observed in the knee laxity at 1 (p = 0.263), 3 (p = 0.263), and 6 months (p = 0.256) follow up between the groups. Similarly, no significant results were observed in within-group knee laxity between 1 and 6 months after ACLR in the intervention (p = 0.155) and control group (p = 0.690).CONCLUSION:The early initiation of OKC along with CKC exercises doesn't seem to increase the ACLR graft laxity as compared to a rehabilitation program with only CKC exercises.

Background After anterior cruciate ligament reconstruction (ACLR), jump tests allow return to sport decision making and may help assessing anterior cruciate ligament injury iterative risk. Objective The main objective was to examine countermovement jump (CMJ) measures to identify which parameters can best distinguish between ACLR and control participants. The secondary objective was to determine whether performance alterations between operated and non-operated limb exist during CMJ after ACLR. Design Non randomized, single blinded, prospective case control study Setting Clinical study Patients This study included 67 patients (ACLR group) with hamstring graft and no contact injury at 6 postoperative months and 47 healthy athletes (control group) with no knee injury history. Interventions Participants were performed 3 CMJ. The best performance was kept for the analysis, while landing on the force plate. Main Outcome Measurements The evaluation of CMJ by force plate was performed to calculate limb symmetry index (LSI) for vertical ground reaction force (vGRF), maximal power (MP) and eccentric rate force development (RFDe) during landing. First analysis compared LSI vGRF, LSI MP and LSI RFDe between both groups. Secondary analysis compared vGRF, MP and RFDe between operated/non-operated limb in the ACLR group and dominant/non-dominant limb in the control group. Results At 6 postoperative months, CMJ measures in the ACLR group were significantly reduced compared to the control group for LSI vGRF (p < 0,001), LSI MP ( p < 0,001) and LSI RFDe ( p < 0,001). Secondary analysis showed no significant result in control group. ACLR group showed significant results for vGRF (p < 0,001), MP (p < 0,001) and RFDe (p < 0,01). Conclusions The results indicate significant alterations on the non-operated limb during CMJ. Landing and deceleration should be better considered at time to return to sport after ACLR.

Background:Open kinetic chain (OKC) exercise is an effective method to improve muscle function during rehabilitation after anterior cruciate ligament reconstruction (ACLR); however, there is controversy about its use in the early phase of rehabilitation. Purpose:To determine (1) whether the use of OKC and closed kinetic chain (CKC) exercises improves quadriceps and hamstring strength in the early phase of rehabilitation after ACLR and (2) whether the early use of OKC exercise affects graft laxity at 3 and 6 months postoperatively in patients with a hamstring tendon graft. Study Design:Cohort study; Level of evidence, 3. Methods:This study included an intervention group that underwent OKC + CKC exercises (n = 51) and a control group that underwent CKC exercise only (n = 52). In the intervention group, OKC exercise for the quadriceps and hamstring was started at 4 weeks after ACLR. At 3 and 6 months postoperatively, isokinetic testing was performed to calculate the limb symmetry index (LSI) and the peak torque to body weight ratio (PT/BW) for the quadriceps and hamstring. Anterior knee laxity was measured by an arthrometer. Results:At 3 and 6 months postoperatively, quadriceps strength was higher in the intervention group than in the control group for the LSI (3 months: 76.14% ± 0.22% vs 46.91% ± 0.21%, respectively; 6 months: 91.05% ± 0.18% vs 61.80% ± 0.26%, respectively; P < .001 for both) and PT/BW (3 months: 1.81 ± 0.75 vs 0.85 ± 0.50 N·m/kg, respectively; 6 months: 2.40 ± 0.73 vs 1.39 ± 0.70 N·m/kg, respectively; P < .001 for both). There were similar findings regarding hamstring strength for the LSI (3 months: 86.13% ± 0.22% vs 64.26% ± 0.26%, respectively; 6 months: 91.90% ± 0.17% vs 82.42% ± 0.24%, respectively; P < .001 at three months, P = .024 at 6 months) and PT/BW (3 months: 1.09 ± 0.36 vs 0.67 ± 0.39 N·m/kg, respectively; 6 months: 1.42 ± 0.41 vs 1.07 ± 0.39 N·m/kg, respectively; P < .001 for both). No significant difference in laxity was observed between the intervention and control groups at 3 or 6 months. Conclusion:Early use of OKC exercise for both the quadriceps and the hamstring, in addition to conventional CKC exercise, resulted in better correction of quadriceps and hamstring strength deficits without increasing graft laxity.

Après reconstruction du ligament croisé antérieur (RLCA), le renforcement de la chaîne cinétique ouverte (CCO) semble être sûre et améliore la force du quadriceps [1], [2]. L’objectif principal de cette étude était de déterminer si l’utilisation précoce associée de la CCO et de la chaîne cinétique fermée (CCF) améliorait la force du quadriceps et des ischiojambiers. L’objectif secondaire était d’évaluer si l’utilisation précoce de la CCO avait une influence sur la laxité du greffon à 3 et 6 mois postopératoires. Cette étude contrôlée non randomisée a inclus 103 patients avec greffe d’ischiojambiers répartis en groupe CCO + CFF (n = 51) et groupe CCF (n = 52). Le protocole CCO a été introduit à 4 semaines après RLCA (31,4 jours ± 7,6) [1], [3], [4]. À 3 mois (101,9 jours ± 18,4) et 6 mois postopératoires (199,2 jours ± 28,1), une évaluation de la laxité [5] et de la force musculaire par dynamomètre isocinétique a été réalisée, pour calculer l’index de symétrie (LSI), le ratio couple de force maximale/masse corporel (PT/BW) pour les quadriceps et les ischiojambiers. À 3 et 6 mois postopératoires, la force du quadriceps dans le groupe CCO + CCF était plus élevée que dans le groupe CCF pour le LSI (76,1 % ± 0,21 vs 46,9 % ± 0,21, p < 0,001, Cohen's d = 1,34 et 91 % ± 0,17 vs 61,8 % ± 0,26, p < 0,001, Cohen's d = 1,29, respectivement) et le PT/BW (1,81 Nm.kg-1 ± 0,75 vs 0,85 Nm.kg-1 ± 0,50, p < 0,001, Cohen's d = 1,5 et 2,40 Nm.kg-1 ± 0,73 vs 1,39 Nm.kg-1 ± 0,70, p < 0,001, Cohen's d = 1,39, respectivement). Il y avait des résultats similaires pour la force des ischiojambiers : LSI (86,1 % ± 0,21 vs 64,3 % ± 0,24, p < 0,001, Cohen's d = 0,94 et 91,9 % ± 0,17 vs 82,4 % ± 0,24, p < 0,001, Cohen's d = 0,45, respectivement) et PT/BW (1,09 Nm.kg-1 ± 0,36 vs 0,69 Nm.kg-1 ± 0,39, p < 0,001, Cohen's d = 0,93 et 1,41 Nm.kg-1 ± 0,41 vs 1,06 Nm.kg-1 ± 0,39, p < 0,001, Cohen's d = 0,67, respectivement). À 3 mois, aucune différence n’a été observée pour la laxité entre les groupes CCO + CCF et CCF (0,38 mm ± 1,19 vs 0,38 mm ± 1,90, p = 0,48). À 6 mois, la laxité était plus importante dans le groupe CCF (0,58 mm ± 1,65 vs 0,44 mm ± 1,20, p = 0,31). Les résultats indiquent que l’utilisation précoce associée de CCO et de CCF permet une meilleure correction des déficits de force des quadriceps et des ischiojambiers et une préparation à la reprise du sport sans augmenter la laxité de la greffe.

AIM: 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 centres of articular rotation. Two main techniques exist: predictive estimation techniques and functional techniques which use a calibration movement to estimate the axes and centres of rotation. These latter techniques, known as functional, seem to show a superiority in terms of reproducibility of the estimate of the axis of rotation of the knee, but no consensus exists. The same applies to the calibration movements used

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 reconstruction with a hamstring graft. Methods: Two populations participated in this study, a healthy group and a group that underwent anterior cruciate ligament reconstruction with a hamstring graft. First, the test group underwent two postoperative assessments on an isokinetic device at 3 and 6 months. Next, we compared the test group at 3 and 6 months with the control group to highlight the differences between the knee flexors maximum effective angle. And finally, we have compared the knee flexors maximum effective angle with the moment of maximum force to determine whether these two values are related. Results: The maximum effective angle is decreased regardless of the duration of rehabilitation (ρ= 0.0019, ρ = 0.037). It does not change significantly during rehabilitation (ρ = 0.29). It does not depend on the strength gained during rehabilitation but on a neuromotor change due to the morphological changes caused by surgery. Conclusion: The study results show that anterior cruciate ligament reconstruction with hamstring graft causes a decrease in knee flexor maximum effective angle.

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 prospective data on two groups of 15 subjects who all suffered an after anterior cruciate ligament (ACL). Each subject is assigned to a group according to the type of rehabilitation they have undergone within the center, with only CKC rehabilitation and mixed OKC and CKC rehabilitation. The protocols were introduced four weeks after ACL reconstruction. The measurements were carried out at three months on an isokinetic dynamometer to measure the peak torque (PT) and to be able to determine limb symmetry index (LSI) and the PT concerning the body weight, the relative peak torque (PT/WB).Results: After testing the LSI and the PT/WB between the two groups, there was a significant difference (p <0.05) between the LSI of the two groups and a very significant difference between the PT/WB (r=0.817; p<0.001). We have also shown a significant positive correlation between these two parameters.Conclusion: The study suggests an interest in the early association of OKC and CKC in correcting quadriceps strength deficits and improving its functional quality after ACL reconstruction.

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 performance professionals to establish robust models to predict and reduce the risk of ACL injury. Developments in medical devices also allow a more precise, more objective assessment and improve the traceability of the various quantitative and qualitative parameters necessary to detect the risk of ACL injury.Results: While general preventive protocols have shown evidence for an overall reduction in injury, there are still limitations regarding ACL injury. Therefore, we can collect personalized data from these models and the variables involved, predict, prevent, and program performance throughout the season. Additionally, the multi-professional team supervising the athlete must establish a close relationship centered on feeling and listening to the player who remains in control of his performance.Conclusion: Let the players decide on their career and not an injury.

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 estimation techniques and functional techniques which use a calibration movement to estimate the axes and centers of rotation. These latter techniques, known as functional, seem to show superiority in terms of reproducibility of the estimate of the axis of rotation of the knee, but no consensus exists. The same applies to the calibration movements used.

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 remains that this concept of time before return to sport is nowadays considered as obsolete. Indeed, the better understanding of the mechanisms of lesion and the strains placed on the graft after reconstruction, allow us to establish a personalized program based on clinical criteria and the patient's objectives. The current scientific literature allows us today to optimize the return to play and performance by the use of neuromotor and neurocognitive approaches, muscle strengthening methods and a preventive program necessary to cover the previous level of the players while taking into account physiological and psychological changes due to ACL reconstruction. Indeed, it is important to have a systemic approach centered on the patient, the sports movement, as close as possible to the field in order to find an optimal function of the knee in interaction with its environment. If there is a risk of reinjury of the ACL, it appears important to be able to identify the risk factors so that the player can return to play in optimal conditions.

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 patient that underwent an anterior cruciate ligament reconstruction with a hamstring graft. The study's objective is to compare the muscular activity of the flexor knee muscle in patients who underwent an anterior cruciate ligament reconstruction with hamstring autograft and the individuals who have not undergone surgery. Methods: The participants have been divided into two groups: a healthy group and an experimental group that underwent an anterior cruciate ligament reconstruction with a hamstring graft. The participants had to perform a strength test on an isokinetic dynamometer. The medial gastrocnemius activity, lateral gastrocnemius, femoral biceps, and the semitendinosus were measured during this test. The first group individuals mentioned the muscle's muscular activity compared to those in the second group via statistical analysis. Then, a ratio of the gastrocnemius muscle activity on the activity of the hamstring has calculated. The results of the experimental group were then compared to the results of the control group. Results: The results showed a significant difference in activity of the medial gastrocnemius (p = 0,004901), the biceps femoris (p = 5,394.10-6), and the semitendinosus muscles (p = 1,822.10-6 ): the experimental group results were superior to the control group results. However, the evaluation of the activity reporting has shown significant differences in the two groups. Conclusion: This study has shown a difference in the gastrocnemius and hamstring muscle activity between patients who underwent an anterior cruciate ligament reconstruction surgery and healthy participants. However, our approach has not allowed us to identify the relationship between a heightened gastrocnemius activity and a diminished hamstring activity following an anterior cruciate ligament reconstruction with a hamstring graft. Quite on the contrary, we observed higher activity of the two muscle groups. Nevertheless, it seems necessary to have a variation in situations during the gastrocnemius muscle analysis to fully understand its purpose in the functional activity of the knee of patients who have undergone an anterior cruciate ligament reconstruction.

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 they return to sport. Isokinetics helps strengthen and assess the strength of muscle groups in the thigh, but controversy exists as to its use by resistance to the open kinetic chain knee extension that would cause the transplant to distend. The objective of this study is to determine the influence of isokinetic muscle strengthening on the possible laxity of the anterior cruciate ligament and to be able to determine risk factors. The study relates to a population having benefited from anterior cruciate ligament reconstruction with hamstring graft from 3 to 6 months after surgery. Two groups are differentiated, one group exposed to isokinetism during rehabilitation, the other group, named unexposed, undergoes rehabilitation without the use of isokinetism. An anterior knee laxity test is performed 6 months postoperatively using the GNRB® machine for all subjects according to the same protocol. The test results were statistically analyzed to determine a relative risk of transplant distension for each group in the study. Comparison of the results of each group by univariate analysis did not reveal any significant result. Multivariate analysis showed interactions in the two strata of the study. It was argued that the use of isokinetics seems to have no effect on the risk of developing distension for the majority of subjects in the exposed group. A tendency towards transplant protection was perceived for each variable except the age under 25 years (RRa = 1.07). The use of isokinetics does not appear to be a cause of transplant distension in patients undergoing an anterior cruciate ligament reconstruction when this method is introduced 3 months postoperatively.

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. These disorders sometimes persist for several months, or even several years after surgery. The present study is therefore interested in determining the risk factors linked to walking disorders following reconstruction of the anterior cruciate ligament. The objective of this study is to determine what risk factors associated with walking disorders are after reconstruction of the anterior cruciate ligament by hamstring graft. This study focused on factors that may exist at 3 and 6 months postoperatively. Two populations participated in this study, a healthy population and a population having benefited from reconstruction of the anterior cruciate ligament. The operated test group is divided into two subgroups, one with a postoperative period of 3 months and the second at 6 months. All subjects were subjected to the same protocol, their gait on the treadmill was analyzed and evaluated with an Optogait® analysis system. A univariate analysis was carried out first. Then, a multivariate analysis by adjustment method was carried out in order to eliminate the potential confounding factors. The comparison of the results between the populations in the univariate analysis shows an absence of significant results however there are trends. The statistical results of the multivariate analysis showed interactions in the two subgroups of the operated population.In fact, it turns out that at 3 months there is a tendency to worse gait disorders in subjects with a high BMI reflecting overweight, when an associated surgical procedure has taken place on the meniscus, in subjects over 35 years of age and males. On the other hand, at 6 months, the tendency to worsening is visible only in the strata represented by subjects with a BMI corresponding to overweight, as well as in subjects having benefited from a meniscal suture associated with ACL reconstruction. .The results of the present study show that there are certain factors which tend to increase the risk of these walking disorders after reconstruction of the anterior cruciate ligament by hamstring graft, these factors are different depending on the time postoperative.

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 remains that this concept of time before return to sport is nowadays considered as obsolete. Indeed, the better understanding of the mechanisms of lesion and the strains placed on the graft after reconstruction, allow us to establish a personalized program based on clinical criteria and the patient's objectives. The current scientific literature allows us today to optimize the return to play and performance by the use of neuromotor and neurocognitive approaches, muscle strengthening methods and a preventive program necessary to cover the previous level of the players while taking into account physiological and psychological changes due to ACL reconstruction. Indeed, it is important to have a systemic approach centered on the patient, the sports movement, as close as possible to the field in order to find an optimal function of the knee in interaction with its environment.If there is a risk of reinjury of the ACL, it appears important to be able to identify the risk factors so that the player can return to play in optimal conditions.

Background: Mechanical alignment (MA) has served as the standard of care in total knee arthroplasty (TKA) for four decades, aiming for a neutral mechanical axis to theoretically optimize implant longevity. Despite technical refinements and the integration of robotic assistance, approximately 20% of patients remain dissatisfied with functional outcomes, prompting an investigation into alternative alignment philosophies that prioritize individual constitutional anatomy. Objective: This review evaluates the methodology, clinical rationale, and current evidence surrounding five distinct alignment strategies: mechanical, anatomical, adjusted mechanical, kinematic, and restricted kinematic alignment. Key Points: Traditional MA utilizes systematic bone cuts perpendicular to the mechanical axis, often necessitating soft tissue releases. Anatomical alignment (AA) modifies this by targeting a 3° varus joint line while maintaining a neutral limb axis. Adjusted mechanical alignment (aMA) allows for residual constitutional varus up to 5°. Kinematic alignment (KA) aims to restore pre-arthritic joint surface orientation and laxity without soft tissue release, though concerns persist regarding long-term component fixation in cases of severe tibial varus. Restricted kinematic alignment (rKA) proposes a hybrid approach, utilizing KA principles within a defined "safe zone" (coronal alignment ≤3° and tibial obliquity ≤5°) to avoid extreme outliers. Conclusion: While MA remains the conventional benchmark, alternative strategies like KA and rKA offer potential improvements in physiological kinematics and patient satisfaction. However, long-term survivorship data for these patient-specific approaches remain limited, and the optimal indications for each philosophy continue to be a subject of clinical debate.

Background: Numerous evaluation criteria are found in the literature to determine the resumption of sport in patients with anterior cruciate ligament (ACL) surgery. Nevertheless, no consensus can conclude today on precise indicators to determine the return to sport (RTS) at 6 months after ACL surgery. Aim: The purpose of this study is to determine whether isokinetic evaluation has indicators representative of the functional status of the knee after ACL surgery with semitendinosus and gracilis tendons (STG) to RTS. Methods: Twenty-two patients, 6.2 months after ACL surgery with STG participated in the study. A correlation was sought between the International Knee Documentation Committee (IKDC) subjective form and the following isokinetic parameters for flexors and extensors at angular velocities of 60°/s and 240°/s: Peak Torque (PT), Flexors /Extensors ratio, PT/kg, and the total work. Results: The statistical analysis found significant correlations between the IKDC subjective form is PT/ kg, PT and total work with the exception of 60°/s flexors. No correlation was found for the flexor / extensor ratio. Conclusion: PT, PT/kg, total work of extensors and flexors at 240°/s and extensors at 60°/s appear to be the best indicators of knee functional status for sports recovery after ACL surgery

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 surgery to those caused by aging. Methods: 2 groups of subjects underwent bilateral and unilateral postural tests. An analysis of the center of pressure’s displacement is carried out for each test. Results: Comparison of the two groups shows no significant difference for the injured leg on the unilateral and bilateral tests only (p-value>0,05). Conclusion: Postural alteration after an ACL reconstruction on the injured leg and bilateral posture can be compared to postural disorders caused by age.