Graphical Model Selection for Gaussian Conditional Random Fields in the Presence of Latent Variables.

We consider the problem of learning a conditional Gaussian graphical model in the presence of latent variables. Building on recent advances in this field, we suggest a method that decomposes the parameters of a conditional Markov random field into the sum of a sparse and a low-rank matrix. We derive convergence bounds for this estimator and show that it is well-behaved in the high-dimensional regime as well as "sparsistent" (i.

[Imaging of the wrist and of the hand: what is the best modality?].

The authors describe the indications for radiologic explorations in case of traumatic as well as non-traumatic conditions. In case of trauma of the wrist, the radiologic exploration looks for a fracture, a dislocation or a ligament injury. Initially, postero-antérior and lateral views must be completed with an antero-posterior view, a scaphoid incidence and an oblique view.

[-Arthrography and computed tomography arthrography of the wrist-].

After a brief review of the pertinent anatomy of joint compartments and main ligaments of the wrist, the authors present the technique of wrist arthrography and CT arthrography. They discuss the normal and pathological patterns. The main indications are the chronic painful wrist and posttraumatic wrist.

Resection of the proximal row of the carpus. A review of 45 cases.

The authors present a review of 45 proximal carpectomies performed for various reasons between 1986 and 1995. The pre- and postoperative assessment was clinical and radiological, and the intra-operative analysis was based on the status of the cartilage of the radiolunate joint, and of the head of the capitate. Postoperative assessment was based on the biomechanical behaviour of the wrist after surgery.

[Imaging of external instabilities of the patella. State of the art].

External femoropatellar instability is a dynamic abnormality from various origins: osseous, cartilaginous or musculotendinous; X-rays films cannot give a precise enough description of this phenomenon. Attention is drawn by anterior pain or a sensation of instability. Clinical analysis distinguishes between permanent, traumatic or transient dislocations which are now more frequently discovered as part of a femoro-patellar syndrome with or without cartilage involvement.