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 DEFINITION
The transitory sinovitis of the hip (STC) or "irritable hip" is a unilateral illness of unknown cause and benign and transitory evolution, which constitutes the most frequent cause of lameness in the children.
INCIDENCIÁ AND CAUSES
The STC is more common between the 2 and 10 years of age (it comes up, 6 years) and is observed more often in the children males. The process appears often simultaneously or after a respiratory viral infection of high routes, and some authors have thought that it constitutes a disorder viral that it affects to the hip.
CLINIC
The children with STC present before themselves with a lameness badly definite, pain in the hip or in the knee and, possibly, febrícula. The children support the hip often in push-up, abduction and external rotation. Compared to the healthy side, the perimeter of the thigh can be diminished.
DIAGNOSIS
- The radiographies can show indirect tumefaction signs to articulate.
- The use of the ultrasound scan has spread increasingly in the diagnosis of the disorders of the hip over his high aptitude to visualize the effusion you will articulate.
Sometimes it is difficult to differentiate the STC of one arthritis septic precocious; if a high grade of clinical suspicion exists, there is that puncionar and to inhale the hip.
TREATMENT
The initial treatment consists of rest in bed, in general citizen, although sometimes it is necessary to hospitalize the patient to discard a sepsis and to relieve this way the worry of the parents and the doctor.
The symptoms can last between 7-10 days, rarely more than 2 weeks. If the disorder is not solved by the rest a more finished study must be carried out to discard other processes that can simulate a STC.
PROGNOSIS
Some patients with STC (2-5 %) evolve presenting within one year the most fearsome Legg-Calvé-Perthes illness. Therefore, in the patients with STC an exploration is necessary to realize one or two times d-rante the year following the sharp presentation of the illness.
WHAT DOCTOR CAN TREAT ME?
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DEFINITION 
