39 research outputs found

    Cartilaginous tibial eminence fractures in children: which recommendations for management of this new entity ?

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    PURPOSE: Cartilaginous tibial eminence fracture (CTEF) is a new pattern of ACL rupture in children under the age of nine. MRI signs have been recently reported, but no series gave information about outcomes. It was hypothesized that primary treatment gave better results than delayed management due to frequent misdiagnosis. METHOD: This retrospective study focused on 15 patients, managed acutely (n = 7) or delayed (n = 8). The patients' median age at the time of initial injury was 6.5 years (range 5-9). Lysholm, IKDC 2000 subjective scores, and the measurement of the residual laxity by a side-to-side difference with a KT-1000 junior arthrometer were used at the time of revision. RESULTS: After a mean follow-up of 9.8 years (range 1-18.5), the mean Lysholm and IKDC subjective scores were, respectively, 97.7 ± 2.6 and 97 ± 3.4. The median residual laxity was 2 mm (range 0-4). Non-operative treatment lead to 2 failures: intermeniscal ligament entrapment and combined avulsion fracture at the femoral site. Suture fixation of the avulsed fragment allows regularly good results when performed acutely or even 4 years after the injury. The hypothesis that primary treatment gives better result than delayed treatment tends to be wrong as 2 failures were reported in each group. An ACL reconstruction was performed in 3 out of the 4 treatment failures. Progressive resorption of the avulsed fragment was noticed in 3 of the 4 failures suggesting an associated ACL resorption. CONCLUSION: CTEF has a good prognosis even after misdiagnosis and treatment at the time of non-union; this could be due to low-energy mechanism of injury and low rate of associated lesion. Orthopaedic treatment for acute minimally displaced fractures is only indicated under strict MRI control, and suture fixation is the recommended strategy in other situations. Conservative management of non-union could expose to ACL involution and cannot be recommended. LEVEL OF EVIDENCE: Retrospective case series, Level IV

    Le Chondroblastome de l'enfant (à propos d'une série multicentrique de 76 cas)

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    LYON1-BU Santé (693882101) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

    Rôle des troubles endocriniens dans la genèse des épiphysiolyses fémorales supérieures

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    LYON1-BU Santé (693882101) / SudocPARIS-BIUM (751062103) / SudocPARIS-Bib. Serv.Santé Armées (751055204) / SudocSudocFranceF

    Étude des propriétés physico-chimiques du cal osseux d'allongement des membres

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    Le régénérat d'allongement osseux de membre est étudié sous trois facettes peu ou pas explorées à ce jour. Le premier objectif de notre travail a été de caractériser la rigidité du régénérat afin d'appréhender au mieux la date d'ablation du fixateur sans prendre de risque de fracture. Des mesures in vivo de rigidité en flexion sur os total sont couplées à une dévaluation par absorptiométrie à rayon X. Cette étude en milieu pédiatrique a montrée que la rigidité osseuse de l'os intact avant allongement était parfaitement corrélée à la taille et au poids du sujet (Coefficient de corrélation linéaire R >= 0,80) et qu'elle devait servir de référentiel patient pour les évaluations ultrérieures. Ainsi le coefficient de rigidité antéropostérieur exprimé en pourcentage est très bien corrélé, au cours d'allongement, au contenu minéral ossceux (CMO) de la zone allongée également exprimé en pourcentage de la valeur mesurée au membre controlatéral (R = 0,82). [...] Le second objectif de notre travail était d'évaluer l'effet d'un facteur de croissance (Bone Morphogenic Proteins) sur l'ostéogenèse en distraction dans un e étude expérimentale chez le lapin. Un groupe d'animaux a fait l'objet d'application de 30 [mu]g/Kg de Rh BMP-7 dans le site d'allongement au moment de l'ostéotomie tibiale. [...] Enfin, une étude ultra structurale du régénérat a été réalisée en micro spectroscopie infrarouge à transformée de Fourier. Les régénérats osseux des animaux du goupe contrôle de la précédente étude ont été exploré. Cette méthode permet de caractériser le ratio minéral/organique ou index de minéralisation, la cristallinité et l'index de carbonatation. L'évolution de ces paramètres au cours de la maturation du régénérat osseux est présentée dans ce travail visant à mieux comprendre le processus de minéralisation du tissu néoformé. L'ensemble de ces travaux répond au même objectif : limiter l'inconfort et la morbidité d'un appareillage prolongé, en cherchant à raccourcir le temps de consolidation, et en définissant des critères objectifs fiables pour l'ablation du fixateur externe qui soient applicables à l'adulte comme à l'enfantLYON1-BU.Sciences (692662101) / SudocSudocFranceF

    Misdiagnosed cartilaginous PCL avulsion in young children

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    Posterior Cruciate Ligaments injuries are rare in children and usually due to bony avulsion fractures or midsubstance tears. This study focused on cartilaginous avulsions initially misdiagnosed despite of MRI assessment. Two 6-year-old boys had cartilaginous avulsion fracture injury at the femoral attachment of the PCL. One had associated medial meniscal lesion and was reinserted. The other conducted to non-union. MRI second lecture reveals an original description with nail-biting sign on cartilage surface of anterior notch, and a close PCL angle without anterior tibial translation. No bone bruise was associated. Similarly, to ACL cartilaginous tibial avulsions, PCL cartilaginous femoral avulsions are underdiagnosed. When knee hemarthrosis occurs under the age of nine, clinician and radiologist should be aware that cartilaginous avulsion of ACL and PCL also could be the main pattern of lesion

    Growth disturbances without growth arrest after ACL reconstruction in children

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    Growth arrest is a major concern after ACL reconstruction in children. It usually occurs in patients near to closure of the growth plates. Growth disturbances without growth arrest are also possible and more vicious; the authors analyse the mechanism of two patients with growth disturbance due to overgrowth following ACL reconstruction. One was a symmetrical overgrowth process with 15 mm limb length discrepancy treated with percutaneous epiphysiodesis. Full correction at the time of skeletal maturity was achieved. The second patient developed an asymmetrical overgrowth with progressive tibial valgus deformity. This mechanism was similar to a posttraumatic tibial valgus deformity. After nonoperative treatment, a spontaneous correction of the deformity was noticed. Both children were young (7 and 10 years old) at the time of ACL reconstruction with an autologous iliotibial band graft. The clinical relevance of overgrowth disturbance is usually limited when compared to growth arrest but could require a second surgical procedure as reported in this study. Parents must be informed that even in experienced hands, and despite the use of a physeal sparing technique, this specific risk of growth disturbance is still present
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