[Post-op paraspinal atrophy: Does the approach matter?].

Objective: To compare the level of post-op muscle atrophy related to the different approaches used in segmental lumbar fusion for degenerative disease (midline vs. Wiltse vs. MIS TLIF).

[Trajectory of lumbar and sacral pedicular screws: Comparison between midline versus wiltse approach].

Objectives: To compare the posterolateral Wiltse approach and conventional Midline approach in short lumbosacral fusions in terms of the angle of convergence of pedicle screws.

Methods: We retrospectively reviewed computed tomography (CT) images of 76 lumbar and sacral pedicular screws that had been placed using a conventional midline approach (CA) ( = 38) and a Wiltse posterolateral approach (WA) ( = 38). All patients underwent short lumbosacral fusions from L3 to S1 for degenerative spinal disease.

[Trend in mortality from external causes in pregnant and postpartum women and its relationship to socioeconomic factors in Colombia, 1998-2010].

Objective: Determine the trend in mortality from external causes in pregnant and postpartum women and its relationship to socioeconomic factors.

Methods: Descriptive study, based on the official registries of deaths reported by the National Statistics Agency, 1998-2010. The trend was analyzed using Poisson regressions.