Biomedical subjects

E Hille

Publications and source records attributed to E Hille.

At least 37 records · Page 2Linked to original sources

PubMed1985

Rotational instability of the patella on radiographic images.

In the period from 1980 to 1981, knee joint radiographs were made in 82 patients following the clinical diagnosis of patellar chondropathy. A total of 119 knee joints with patellar chondropathy and 45 with no specific complaints on the contralateral side, in addition to a control cohort consisting of 28 persons, i.e., 56 knee joints with no complaints, were evaluated. Tangential radiographic images of the patellae enabled us to measure directly the rotation of the patella around the axis perpendicular to its center. It could be established that all healthy patellae underwent medial rotation between 45 and 60 degrees of knee flexion which was maintained up to 90 degrees, whereas the affected knee joints did not rotate.

Adolescent↗

PubMed1983

The importance of the mediopatellar synovial plica for chondromalacia patellae.

In 60 autopsy knee joints findings on morphology and topography of medio- and suprapatellar plicae and level of insertion of the medial vastus muscle in relation to localization and degree of severity of chondromalacia were determined. The middle fields were affected most frequently and severely with 70% (chondromalacia class II and III). Thirty specimen with mediopatellar plica could be identified out of which 29 (97%) had class II or III chondromalacia; out of 30 specimen without a plica 18 (60%) showed chondromalacia. Accordingly a significant correlation could be detected between the incidence of chondromalacia and that of a mediopatellar synovial plica. When measuring the level of insertion of the medial vastus muscle class III chondromalacia showed an average level of insertion of 11%, class II of 22%, and class O or I of 30%. These differences are statistically significant. Patellar index, patellar facet angle, and patellar depth angle did not show any direct correlation to chondromalacia. The question arises whether the involution anomaly of the genicular septa and the muscular changes are not a manifestation of the same developmental disorder, thus creating the basis for an imbalance of the dynamic functional structure.

Adolescent↗

PubMed1972

Pseudo-Poles in the Theory of Emden's Equation.

It is known that Emden's equation y'' = x(1-m)y(m) has movable singularities where the solution becomes infinite for one-sided approach. If m = (p + 2)/p, p positive integer, the singularities look like poles of order p. In this note expansions in terms of powers and logarithms are obtained from which the nonpolar nature of these "pseudo-poles" becomes evident. Various extensions are considered. Convergence proofs are deferred to a more detailed publication.

Journal Article↗

PubMed1969

On the Thomas-fermi equation.

A study has been made of some mathematical aspects of the Thomas-Fermi equation. This is a preliminary report on the results obtained, including (1) convergence of relevant series, (2) existence of unbounded solutions, (3) existence of solutions having an arbitrary branch point, (4) determination of a class of solutions bounded for large values of the variable, and (5) determination of a class of solutions unbounded for small values.

Journal Article↗

PubMed1954