Osseointegration underlying orthodontic anchorage was not affected by loading. BIC increased with time and varied according to implantation site. Particularly the tight-fitting screw insertion appeared crucial in determining the appropriate bone healing response.

In a case of a neglected radial neck fracture in childhood, the management of initial fracture and its complications are subjected to discussion. In children, open reduction should be avoided but an angulation less than 30° must be obtained. Several techniques exist to manage symptomatic malunion in adults, including resection, prosthesis, and osteotomy. When performing an osteotomy, it is important first to preserve an intact osseous hinge to avoid avascular necrosis and second to align the edge of the radial head articular surface with the lateral edge of the coronoid process, in order to avoid overstuffing elbow joint.

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Objectives: The initial clinical presentation of the discoid lateral meniscus (DLM) in children is highly variable and can be difficult to assess. The aim of this study was to focus on the meniscal instability associated with DLM and to correlate clinical, MRI and arthroscopic data. Methods: Between 2008 and 2018, 93 children and adolescents with 114 DLMs who underwent surgery in a referral center were included. Based on the anamnesis and clinical data, three types of meniscal instability of increasing severity were defined: occasional ("lock"), regular ("clock") and permanent ("block") instability. These findings were correlated with preoperative MRI data and arthroscopic findings according to Ahn’s classification, and as a result we were able to propose a DLM classification based on clinical or MRI data or both combined. Results: A wide variety of presentations was noted with 18 different types when clinical, MRI and arthroscopic characteristics were combined. 94% of the symptomatic DLMs for which surgery was performed showed instability due to meniscocapsular separation. Clinically, there were "lock", "clock" and "block" instability in 2%, 50% and 31% of DLMs respectively. Preoperative MRI indicated no meniscal shift and an anterocentral, posterocentral or central shift in 41%, 9%, 22% and 28% of the DLMs, respectively. Arthroscopic findings indicated no lesions, or an MC-A, MC-P or PLC type lesion in 6%, 46%, 15% and 33% of DLMs respectively. The most frequent presentations were “clocked” knees with MC-A lesions and “blocked” knees with PLC lesions. Only in 60% of the cases was a good level of correspondence noted between the different data. Conclusion: The association of meniscal instability and symptomatic DLM in children should be accepted as a certainty. “Locked”, “clocked” and “blocked” knees could represent different stages of increasing severity in the natural history of DLM instability.

In 12 patients operated on for bone sarcoma resection, a postoperative magnetic resonance imaging of the resection specimens was obtained in order to assess the surgical margins. Margins were classified according to MRI in R0, R1, and R2 by three independent observers: a radiologist and two orthopaedic surgeons. Final margin evaluation (R0, R1, and R2) was assessed by a confirmed pathologist. Agreement for margin evaluation between the pathologist and the radiologist was perfect (κ = 1). Agreement between the pathologist and an experienced orthopaedic surgeon was very good while it was fair between the pathologist and a junior orthopaedic surgeon. MRI should be considered as a tool to give quick information about the adequacy of margins and to help the pathologist to focus on doubtful areas and to spare time in specimen analysis. But it may not replace the pathological evaluation that gives additional information about tumor necrosis. This study shows that MRI extemporaneous analysis of a resection specimen may be efficient in bone tumor oncologic surgery, if made by an experienced radiologist with perfect agreement with the pathologist.

For evident ethical reasons, our data were limited by the size of the tissue fragments and the limited number of patients and variety of clinical presentations. The healing reactions consisted mainly in mature lamellar bone tissue sparsely in contact with the screw or the miniplate, with signs of a moderate remodelling activity.

Introduction: Congenital pseudarthrosis of the radius or ulna is rare and less common than congenital pseudarthrosis of the tibia. It may lead to deformity, pain and functional impairment. Objectives: Remind that conventional fracture treatment as non-surgical treatment or open reduction and internal fixation is not successful in congenital pseudarthrosis. Case: A missed diagnosis of an 8-year-old girl with late onset pseudarthrosis of both radius and ulna associated with neurofibromatosis is presented. In this case, inadequate initial treatment led to poor results. The use of free vascularized fibular grafts is known to be effective to treat this condition but has some local and lower limb morbidity. Final success was obtained with large resection and bone transport. Conclusion: It is important to recognize the entity to avoid failure of treatment.

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