[Posttraumatic osteoarthrosis in a patient with chronic anterior cruciate ligament rupture. Case report and review of the literature].

Anterior cruciate ligament (ACL) rupture is a very important epidemiological pathology in our environment. It has a peak incidence between 16 to 39 years of age. It is estimated that between 70-84% of ACL injuries are non-contact.

[Functional evaluation of the management of massive rotator cuff ruptures with the use of the subacromial balloo].

Introduction: Rotator cuff (MR) ruptures occur in more than 50% of patients over the age of 60, and can cause changes in normal shoulder biomechanics that can trigger rotator cuff tear arthropathy. There is currently no consensus on treatment for massive rotator cuff tears.

Objective: To evaluate the clinical and radiographic outcomes of subacromial balloon placement in these lesions.

[Proximal humerus fractures: clinical assessment and functional outcome in patients with osteonecrosis of the humeral head].

Introduction: Fractures of the proximal humerus resulting in three or more fragments represent a high risk of necrosis. The former is the second most frequent site of necrosis, only after the femur, due to either traumatic or nontraumatic causes. The former are the most common, with an incidence rate of necrosis of 13-34% in fractures with more than four fragments.

[Nontraumatic causes of bilateral avascular necrosis of the femoral head: link between hepatitis C and pegylated interferon].

Background: Avascular necrosis of the femoral head is a frequent condition in patients with a history of trauma. The major pathologic causes include vascular diseases, malignancies, hypercoagulability states, long-term steroid treatment, and some patients have a history of hepatitis C infection treated with pegylated interferon and ribavirin. Upon studying the behavior of the hepatitis C virus, Seef, Foster and Poynard found a hypercoagulability state that causes interruption of retinacular blood flow to the femoral head, without an increased incidence of osteonecrosis in this patient group.