11,447 research outputs found
Post-operative rehabilitation after PIP joint arthroplasty with early active motion: A retrospective review of outcomes
We present a retrospectively review of outcomes of the first fifteen patients who underwent proximal interphalangeal (PIP) joint arthroplasty and were treated using the same early active motion rehabilitation regime introduced by the therapy department at Mount Vernon Hospital. The regime utilises early motion of the PIP joint while protecting the arthroplasty with a small static splint and digit strapping to reduce lateral forces on the joint.
The notes of fifteen patients were reviewed and their outcomes presented. To evaluate the outcomes in more detail the patients were divided into three groups according to their diagnostic reason for the procedure (rheumatoid arthritis, osteoarthritis and trauma). The overall mean arc of motion at the PIP joint on discharge from therapy was 54 improved from 28 pre operatively.
The patients with the osteoarthritic PIP joints gained the largest improvement in the PIP joint arc of motion and required the least rehabilitation intervention. Patients with rheumatoid arthritis required intense rehabilitation to gain less overall PIP joint motion but still reported satisfaction with their outcome. All 15 patients experienced an improvement in their pain level and subjectively reported increased function in their affected hand.
Following this retrospective review of cases the team continue to use this regime for metal and silastic prosthesis but now routinely provide additional written information pre operatively to assist patientsâ understanding of the procedure and the extent of the rehabilitation required
Molecular Realism in Default Models for Information Theories of Hydrophobic Effects
This letter considers several physical arguments about contributions to
hydrophobic hydration of inert gases, constructs default models to test them
within information theories, and gives information theory predictions using
those default models with moment information drawn from simulation of liquid
water. Tested physical features include: packing or steric effects, the role of
attractive forces that lower the solvent pressure, and the roughly tetrahedral
coordination of water molecules in liquid water. Packing effects (hard sphere
default model) and packing effects plus attractive forces (Lennard-Jones
default model) are ineffective in improving the prediction of hydrophobic
hydration free energies of inert gases over the previously used Gibbs and flat
default models. However, a conceptually simple cluster Poisson model that
incorporates tetrahedral coordination structure in the default model is one of
the better performers for these predictions. These results provide a partial
rationalization of the remarkable performance of the flat default model with
two moments in previous applications. The cluster Poisson default model thus
will be the subject of further refinement.Comment: 5 pages including 3 figure
Construction of Simulation Wavefunctions for Aqueous Species: D3O+
This paper investigates Monte Carlo techniques for construction of compact
wavefunctions for the internal atomic motion of the D3O+ ion. The polarization
force field models of Stillinger, et al and of Ojamae, et al. were used.
Initial pair product wavefunctions were obtained from the asymptotic high
temperature many-body density matrix after contraction to atom pairs using
Metropolis Monte Carlo. Subsequent characterization shows these pair product
wavefunctions to be well optimized for atom pair correlations despite that fact
that the predicted zero point energies are too high. The pair product
wavefunctions are suitable to use within variational Monte Carlo, including
excited states, and density matrix Monte Carlo calculations. Together with the
pair product wavefunctions, the traditional variational theorem permits
identification of wavefunction features with significant potential for further
optimization. The most important explicit correlation variable found for the
D3O+ ion was the vector triple product {\bf r}({\bf
r}{\bf r}). Variational Monte Carlo with 9 of such
explicitly correlated functions yielded a ground state wavefunction with an
error of 5-6% in the zero point energy.Comment: 17 pages including 6 figures, typos correcte
Quasi-chemical Theories of Associated Liquids
It is shown how traditional development of theories of fluids based upon the
concept of physical clustering can be adapted to an alternative local
clustering definition. The alternative definition can preserve a detailed
valence description of the interactions between a solution species and its
near-neighbors, i.e., cooperativity and saturation of coordination for strong
association. These clusters remain finite even for condensed phases. The
simplest theory to which these developments lead is analogous to quasi-chemical
theories of cooperative phenomena. The present quasi-chemical theories require
additional consideration of packing issues because they don't impose lattice
discretizations on the continuous problem. These quasi-chemical theories do not
require pair decomposable interaction potential energy models. Since
calculations may be required only for moderately sized clusters, we suggest
that these quasi-chemical theories could be implemented with computational
tools of current electronic structure theory. This can avoid an intermediate
step of approximate force field generation.Comment: 20 pages, no figures replacement: minor typographical corrections,
four references added, in press Molec. Physics 199
A system of relational syllogistic incorporating full Boolean reasoning
We present a system of relational syllogistic, based on classical
propositional logic, having primitives of the following form:
Some A are R-related to some B;
Some A are R-related to all B;
All A are R-related to some B;
All A are R-related to all B.
Such primitives formalize sentences from natural language like `All students
read some textbooks'. Here A and B denote arbitrary sets (of objects), and R
denotes an arbitrary binary relation between objects. The language of the logic
contains only variables denoting sets, determining the class of set terms, and
variables denoting binary relations between objects, determining the class of
relational terms. Both classes of terms are closed under the standard Boolean
operations. The set of relational terms is also closed under taking the
converse of a relation. The results of the paper are the completeness theorem
with respect to the intended semantics and the computational complexity of the
satisfiability problem.Comment: Available at
http://link.springer.com/article/10.1007/s10849-012-9165-
Spin-memory loss at Co/Ru interfaces
We have determined the spin-memory-loss parameter, , by
measuring the transmission of spin-triplet and spin-singlet Cooper pairs across
Co/Ru interfaces in Josephson junctions and by Current-Perpendicular-to-Plane
Giant Magnetoresistance (CPP-GMR) techniques. The probability of spin-memory
loss at the Co/Ru interface is . From the CPP-MR, we
obtain that is in good agreement with
obtained from spin-triplet transmission. For
spin-singlet transmission, we have that is
different from that obtained from CPP-GMR and spin-triplet transmission. The
source of this difference is not understood.Comment: 9 pages, 9 figure
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