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When acute arthralgia is associated with focal osteoporosis and reversible epiphyseal edema, all three spontaneously resolving without sequelae in a few months, it is then called transient focal osteoporosis. Well known at the hip, this pathology may be expressed at other joints and have a migratory character. In this case report, the patient presented himself with migrating transient focal osteoporosis that successively undertook, over one year, various anatomical zones within the same knee and then reached the contralateral knee. The evolution was characterized by a healing without sequelae after discharge and analgesic treatment.Lorsqu’une arthralgie aiguë est associée à une ostéoporose focale et à un oedème épiphysaire réversible, tout trois spontanément résolutifs sur le plan clinique et iconographique sans séquelles en quelques mois, la pathologie est alors nommée ostéoporose régionale transitoire. Bien connue à hauteur de la hanche, elle peut s’exprimer au niveau d’autres articulations, préférentiellement portantes des membres inférieurs et posséder un caractère migratoire. Dans ce rapport de cas, le patient a présenté une ostéoporose focale transitoire migrante touchant successivement, sur une année, diverses zones anatomiques au sein d’un même genou pour atteindre ensuite le genou controlatéral. L’évolution s’est caractérisée par une guérison sans séquelles après décharge et traitement antalgique.

The anterior tarsal tunnel syndrome is a rare entrapment neuropathy of the deep peroneal nerve beneath the inferior extensor retinaculum of the ankle. It is frequently unrecognized and may lead to misdiagnosis and delayed treatment. We report the case of a 77 year old patient complaining of symptoms of an anterior tarsal tunnel syndrome with neuropathic pain located at the dorsal part of the foot, without any sensorimotor loss. The ENMG was in favour of a motor impairment of the deep peroneal nerve. MRI exploration of the ankle showed a millimetric bony overgrowth of the upper pole of the navicular bone, irritative to the deep peroneal nerve. Infiltration at overgrowth of the navicular provided a partial and temporary decrease in pain symptoms. Surgical nerve decompression was then considered.

This case report is concerned with a 30 year old patient diagnosed with pigmented villonodular synovitis (PVNS) in the knee. The patient underwent an orthopedic surgical operation to remove the lesions. PVNS is a rare proliferative disorder, mostly benign and affecting the knee; its aetiology remains unclear. It represents a medical challenge because of non-specific symptoms that delay the diagnosis with a very high rate of recurrence. MRI imaging is necessary to explore the lesions, but the final diagnosis can only be made after anatomopathologic analysis of the excised lesions. When multiple lesions are present, the treatment consists of their excision by arthrotomy, or by arthroscopy if the disease is localized.