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We report four cases of transient hip osteoporosis studied between 1995 and 1997. All patients were men. The diagnosis was based on clinical symptoms, absence of abnormal laboratory tests, increased uptake in the femoral head and neck on Tc-99 bone scans and magnetic resonance imaging showing Oedema of the bone marrow. In three patients radiographs showed osteopenia of the head and neck of the involved femur, whereas no major radiographic changes were seen in the fourth patient. The clinical symptoms lasted 7 months and there was no recurrence after 8-24 months' follow-up.Résumé Quatre cas d' Ostéoporose Transitoire de la Hanche ont été étudiés entre 1995 et 1997. Le diagnostic a été retenu sur des arguments cliniques, l'absence d'anomalies dans les analyses et l'existence d'une hypercaptation gammagraphique homogène à la tête et au col du fémur ainsi que sur un patron d'oedème de la moelle osseuse en Résonance Magnétique. Dans un cas, la radiologie conventionelle a été normale pendant tout le processus tandis que les trois autres cas ont présenté une ostéoporose radiologique depuis la tête du fémur jusqu'à la zone trochantérienne. La dureé de la symptomatologie a été de 7 mois. Il ne s'est pas produit de récurrence locale après un suivi de 8-24 mois.

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Study Objectives: Three predictive scoring tools have been developed to identify low-risk patients with isolated subdural hematoma and preserved consciousness: the Orlando criteria, the SafeSDH Tool, and the Brain Injury Guidelines (BIG) criteria. We aim to validate and compare these three predictive tools in a single cohort of patients with isolated subdural hematomas.Methods: We performed a retrospective chart review of patients age > 16 with GCS >¼ 13 with CT-confirmed isolated subdural hematomas who presented to 1 academic and 3 community EDs. The Orlando criteria, SafeSDH Tool, and BIG criteria were applied to this dataset with a primary composite outcome (CO) of neurologic deterioration (severe headache, altered mental status, seizure, intubation), neurosurgical intervention, or death. Predictors used in the Orlando tool were: hematoma size and the presence of acute-on-chronic hematoma. The Orlando criteria was applied using the maximum sensitivity cutoff of 0.0235 from the derivation study. The Orlando Tool was also tested on both neurosurgical intervention (NI) (as in the derivation study), as well as the primary CO. The SafeSDH Tool includes the following predictors: use of warfarin, use of clopidogrel, number of hematomas, hematoma thickness, GCS, and midline shift. Cutoff used for this model was 0.0432, as in derivation. BIG criteria predictors included: intoxication, hematoma size, number of hematomas, and presence of skull fracture. Patients meeting both BIG1 and BIG2 criteria were considered low risk as these patients were deemed safe for management without neurosurgical consultation in derivation. The BIG criteria were not derived via regression, so no threshold cutoff was used and area under the receiver-operator curve (AUROC) was not calculated.