Heterotopic ossification in Dupuytren's disease: clinical and histological significance.

We report the case of an 82-year-old man who underwent fasciectomy for a severe Dupuytren's contracture, during which an ossified lesion was encountered within the contracture and surrounding the neurovascular bundle. The abnormal tissue was removed with difficulty and heterotopic ossification was confirmed histologically. We believe this is the first report of heterotopic ossification in Dupuytren's disease.

Molecular dynamics of haloalkane corral formation and surface halogenation at Si(111)-7 x 7.

Long-chain organic molecules, 1-halododecane, RX (X = Cl,Br), adsorbed on Si(111)-7 x 7 were shown to form stable dimeric corrals; type I around corner holes and type II around corner adatoms S. Dobrin et al. [Surf. Sci. Lett. 600, L43 (2006)]. Here we examine the molecular dynamics of corral formation, in which mobile physisorbed adsorbates spontaneously convert to immobile. At high coverage the mechanism gives evidence of involving collisions between mobile vertical monomers, giving types I and II immobile horizontal dimers, vD +vD -->h2 (I, II). At low coverage mobile vertical monomers collide with immobile horizontal ones to form largely type-II corrals, vD + h-->h2 (II). Thermal reaction of corrals with X = Br brominates the surface by two distinct molecular pathways, thought to have more general applicability: "daughter-mediated" reaction of vertical v(A) with a low activation energy (here Ea approximately 5 kcal mol(-1)) and "parent-mediated" reaction of horizontal h or h2 with high activation energy (here Ea = 29 kcal mol(-1)).

Theoretical investigation of the SO(2+) dication and the photo-double ionization spectrum of SO.

Highly correlated ab initio methods were used in order to generate the potential energy curves of the electronic states of the SO(2+) dication and of the electronic ground state of the neutral SO molecule. These curves were used to predict the spectroscopic properties of this dication and to perform forward calculations of the double photoionization spectrum of SO. In light of spin-orbit calculations, the metastability of this doubly charged ion is discussed: for instance, the rovibrational levels of the X (1)Sigma(+) and A (3)Sigma(+) states are found to present relatively long lifetimes. In contrast, the other electronic excited states should predissociate to form S(+) and O(+) in their electronic ground states. The simulated spectrum shows structures due to transitions between the v=0 vibrational level of SO (X (3)Sigma(-)) and the vibrational levels below the barrier maximum of 11 of the calculated electronic states. The 2 (1)Sigma(+) electronic state of SO(2+) received further treatment: in addition to vibrational bands due to the below barrier energy levels of this electronic state, at least nine continuum resonances were predicted which are responsible for the special shape of the spectrum in this energy region. This work is predictive in nature and should stimulate future experimental investigations dealing with this dication.

Ulnar tunnel syndrome due to anatomical variant of the ulnar artery.

We report a case of ulnar tunnel syndrome due to an anatomical variant branch of the ulnar artery. Anatomical variants can cause compression not visible on imaging and need to be considered for successful surgical decompression.

Distal scaphoid excision after radioscaphoid arthrodesis.

Radioscaphoid and radioscapholunate arthrodeses are effective surgical procedures for the treatment of nonsalvageable and isolated radiocarpal arthritis. These procedures, however, limit wrist motion significantly as the immobile scaphoid bridges the remaining midcarpal joint. A cadaver study of radioscaphoid arthrodesis followed by distal scaphoid excision was undertaken. Range of motion after radioscaphoid K-wire fixation alone demonstrated a 58% decrease in the preoperative flexion-extension arc to 60 degrees. After distal scaphoid excision (with the radioscaphoid pins still in place) the flexion-extension arc increased to 122 degrees or 86% of the preoperative range of motion; most of the increase in motion occurred at the midcarpal joint. Distal scaphoid excision releases the midcarpal joint following radioscaphoid fixation and results in a significantly greater wrist motion. If the results of this cadaver study are extrapolated to clinical practice the addition of this step to the previously described procedures of radioscaphoid or radioscapholunate arthrodesis addresses their major limitation, restricted motion.

Direct measurement of a pure rotation transition in H2(+).

The N = 1<--0 pure rotation transition in the nu = 19 level of the ground electronic state of H2(+) was observed at 14,961.7+/-1.1 MHz. Recent theory predicts significant electric dipole intensity in forbidden rotation and rotation-vibration transitions involving levels near the dissociation limit; the relevant levels are bound by only 0.74 and 0.22 cm(-1). The transition was predicted to have a transition moment of 0.42 D; our measurement is consistent with this value.

Multiple guide wire technique for removal of the short distal fragment of a fractured intramedullary nail.

A method of removing a short distal fragment of a fractured intramedullary nail, using impacted olive-tipped guide wires, is described. We have used this technique with success when there has been a very short segment of nail left distally. This method gives improved grip and control of alignment of the nail fragment during extraction.

What do middle-aged New Zealanders eat? A dietary survey in 50-54 year olds in south Canterbury and north Otago.

Information on diet was obtained from a random sample of 50-54 year olds in October 1985 when a health survey was conducted in the Timaru health district. This survey formed part of the international cardiovascular diseases and alimentary comparison (CARDIAC) study. A seven-day dietary history was obtained from 99 male and 82 female participants who were not taking any antidiabetic or antihypertensive medication. The median daily energy intake was 10.5 MJ for the men and 6.3 MJ for the women. The median daily total fat intake for men and women respectively was 103 g and 68 g. The median ratio of polyunsaturated to saturated fatty acids was low, 0.19 for the men and 0.18 for the women. Total fat contributed 37.5% to energy intake of men and 38.5% to energy intake of women and alcohol contributed 5.1% for men and 2.1% for women. Mineral and vitamin intakes were generally satisfactory. A substantial proportion of the participants, particularly women, claimed to have decreased their total food, fat, salt, meat, eggs and milk intakes and to have increased their vegetable and fish consumption.