[Does the medial-lateral stability of total knee replacements have an effect on short-term clinical outcomes? One-year results of a multicentre study with computer assisted surgery]. / Influye la estabilidad mediolateral de las artroplastias totales de rodilla en la evolución clínica a corto plazo? Estudio multicéntrico a un año con cirugía asistida por ordenador.

OBJECTIVE: To evaluate the influence of the medial-lateral stability of the joint on the short-term clinical outcomes after performing navigation in total knee replacement. MATERIAL AND METHODS: A multicentre prospective study was conducted on 111 consecutive total knee replacements performed with computer assisted surgery. The study included the evaluation of KSS, WOMAC, and SF-12 preoperatively, and at 3 and 12 months of follow-up, and correlation with stability data obtained during surgery, in extension and at 20° and 90° of flexion. RESULTS: No differences were found in WOMAC, KSS and SF-12 relative to coronal stability during surgery. CONCLUSIONS: Variations in coronal stability were shown to have no influence on the short-term clinical results of navigated total knee replacement.

[Back pain in children]. / Dolor de espalda en la infancia.

OBJECTIVE: The incidence of back pain in children in our country is unknown. Several causes can produce this symptom, but it is necessary to rule out pathologies that require specific treatments. The goal of this work was to study the incidence and the etiology of back pain in children in our country. PATIENTS AND METHODS: We present a prospective study done in our Orthopedic Department during a period of 7 months. Twenty-two patients were referred with back pain of at least two months duration. The incidence was 2.9% compared to the total number of patients. The average age ranged from 7 to 17 years. RESULTS: A careful history and a radiological examination diagnosed 50% (11 cases) of the causes of backache in the present study. An idiopathic etiology was the most frequent cause and represented 9 patients (41%). In the remaining 12 cases (59%) pathological causes that required special treatment were identified including 2 cases of Scheuermann disease, 4 cases of painful scoliosis, 3 spondylolysis with spondylolisthesis, 2 cases of discitis, 1 benign neoplasm and 1 psychogenic cause. CONCLUSIONS: We recommend conservative management with the use of medication for relief of pain and physical therapy in the idiopathic cases. In the remaining cases, the specific treatment of the disease can improve the back pain.