Unique Curing Properties through Living Polymerization in Crosslinking Materials: Polyurethane Photopolymers from Vinyl Ether Building Blocks.

Photopolymers with unique curing capabilities were produced by combining living cationic polymerization with network formation and restricted polymer motion. A vinyl ether diol was synthesized as a functional building block and reacted with isophorone diisocyanate to form a highly functionalized vinyl ether polyurethane as a model system with high crosslinking ability. When using a cationic photoinitiator, fast polymerization is observed upon short UV irradiation.

Combined experimental and theoretical study of the reactivity of γ-Butyro- and related lactones, with the OH radical at room temperature.

The total rates of reaction between four cyclic esters (β-butyro-, γ-butyro-, γ-valero- and δ-valero-lactones) and the OH radical have been measured relative to the rate of reaction of a reference compound, ethene, at room temperatures. The measurements show that the rates increase with increasing ring size. Theoretical calculations on the four lactones with the inclusion of a fifth, α-methyl-γ-butyrolactone, are broadly in agreement with this picture but provide a more insightful view of the sites at which hydrogen atom abstraction occurs in each molecule.

Arthroscopic electrothermal shrinkage of chronic posterolateral elbow instability: good or moderate outcome in 21 patients followed for an average of 2.5 years.

Background: The lateral collateral ligament complex is the key structure involved in recurrent elbow instability. Treatment is surgical, by repair or reconstruction of the lateral collateral ligament complex. We evaluated the effect of arthroscopic electrothermal shrinkage for treatment of chronic posterolateral rotator elbow instability.

A study for evaluating the effect of the deltoid-flap repair in massive rotator cuff defects.

The repair of massive cuff defects by direct suture often is impossible. In these cases, a repair by musculo-tendineous flaps (latissimus-dorsi, pectoralis or deltoideus) is required. It was the goal of this study to evaluate the result of delta-flap repair in case of massive cuff defects with a diameter of 5 cm or more.

Operative treatment of deep chondral defects of the patella: results after abrasive arthroplasty and periosteal arthroplasty.

This prospective, non-randomized study was aimed to evaluate the effects of abrasive arthroplasty and periosteal arthroplasty in the treatment of deep chondral defects of the patella. A total of 30 patients in group A (13 male, 17 female, age: 28.7+/-6.