The crystal structure of L-arginine.

We report the crystal structure of L-arginine, one of the last remaining natural amino acids for which the crystal structure has never been determined; structure determination was carried out directly from powder X-ray diffraction (XRD) data, exploiting the direct-space genetic algorithm technique for structure solution followed by Rietveld refinement.

[Meniscal injuries and associated lesions seen in the light of long-term results after meniscectomy].

The authors have put together their experience of the long-term results after meniscectomy. They came to the following conclusions: 1. A knee joint does not become unstable after removal of a cartilage unless there is another connected lesion.

[Recurrent dislocation of the shoulder].

Study of 55 cases of recurrent dislocation of the shoulder treated by the operation of Bankart and Putti-Platt during 10 years. A new dislocation after the operation was present in one single case. The authors opinion is that the most important point of the technique is the correct reinsertion of the anteroinferior part of the capsule.