Intraarticular injection of platelet-rich plasma in knee osteoarthritis: single versus triple application approach. Pilot study.

Objective: To compare the clinical effectiveness of the triple intra-articular injection of platelet-rich plasma (PRP) with respect to the single injection in patients with mild osteoarthritis of the knee.

Methods: A total of 35 patients with a clinical and radiographic diagnosis of osteoarthritis grade I and II were analyzed. They were randomized into two groups: single application (18 patients) and triple application (17 patients).

[Morphometric characteristics of the asterion and the posterolateral surface of the skull: its relationship with dural venous sinuses and its neurosurgical importance].

Background: The knowledge of the location and morphometric of the lateral venous sinus (transverse and sigmoid), and their relationship with the asterion and other surface anatomical landmarks, it is imperative for posterolateral approaches to the posterior cranial fossa to avoid vascular structures injury and surgical complications.

Objective: Determine an anatomical area security for a drill that allows entry into the posterior cranial fossa without damaging adjacent structures, and study the morphometric characteristics asterion, the lateral sinus and bony landmarks of the posterolateral surface of the skull.

Methods: With a 1.