Van Riet Research Articles

Result of a pyrocarbon prosthesis after comminuted and unreconstructable radial head fractures

The purpose of this study is to analyze the results of treating unreconstructable acute radial head fractures associated with other elbow fractures and soft-tissue injuries with a pyrocarbon radial head prosthesis replacement, as well as repair of the associated injuries. Twenty-eight patients with Mason type III unreconstructable and unstable radial head fractures and with associated injuries (according to Hotchkiss classification modified by van Riet) were treated with a pyrocarbon radial head prosthesis replacement; repair of collateral ligaments and associated elbow fractures was also carried out. Patients were evaluated in accordance with the Mayo Elbow Performance Score, measuring pain, grip strength, range of motion, and stability, as well as radiographic images. After a mean of 32 months postoperatively (range, 12-62 months), the mean Mayo Elbow Performance Score was 92 points. The result was considered excellent or good in 25 patients, with a high degree of satisfaction and functional restoration. The results of treating Mason type III radial head fractures with additional elbow fractures and soft-tissue injuries with pyrocarbon radial head prostheses are satisfactory; nevertheless, long-term follow-up is still necessary.

Diarrhea during the Conditioning Regimen Is Correlated with the Occurrence of Severe Acute Graft-versus-Host Disease through Systemic Release of Inflammatory Cytokines

Graft-versus-host disease (GVHD) is a major obstacle to the success of allogeneic hematopoietic stem cell transplantation (allo-HSCT). Although many indicators have been used to predict GVHD, the prediction of GVHD remains very difficult. Determining how to predict the occurrence of acute GVHD (aGVHD) as exactly as possible has been a huge challenge so far. Systemic release of inflammatory cytokines during the conditioning regimen and early-phase post-HSCT plays a crucial role in the generation of aGVHD; additionally, the conditioning regimen causes the damage to the intestinal tract. Diarrhea is a common symptom of intestinal tract damage during the conditioning regimen. We therefore performed a prospective study to investigate the relationship between diarrhea related to the conditioning regimen, systemic release of inflammatory cytokines during the conditioning regimen and the early-phase post-HSCT, and the development of aGVHD. This study demonstrated that duration of diarrhea was >5.5 days, with a maximal volume >8.72 mL/kg and a mean volume of diarrhea for days -3 to 0 >7.94 mL/kg were risk factors of grade II to IV aGVHD. Diarrhea with any 1 risk factor was defined as severe diarrhea. Furthermore, this study first confirmed that the correlation between diarrhea and aGVHD was related to the serum levels of tumor necrosis factor (TNF)-α and interleukin (IL)-6 during the conditioning regimen and during the early phase after transplantation. Our study demonstrated that diarrhea related to the conditioning regimen could be used as a marker for the prediction of aGVHD and further explain the possible mechanism underlying the linkage described here. Therefore, for the patients with severe diarrhea related to the conditioning regimen, low-dose glucocorticoid may be used to reduce the levels of inflammatory cytokine release by a damaged intestinal tract, and possibly further reduce the occurrence of aGVHD. For these patients, prophylaxis of aGVHD may be need to be adjusted individually.

Bifid insertion of the distal biceps brachii tendon with isolated rupture: Magnetic resonance findings

Rupture of the distal biceps brachii tendon is greatly outnumbered by rupture of the proximal attachment of the long head from the bicipitolabral anchor at the superior glenoid, with rupture of the origin of the proximal tendon of the short head of biceps an exceedingly uncommon injury. 1 Athwal G.S. Steinmann S.P. Rispoli D.M. The Distal Biceps Tendon: Footprint and Relevant Clinical Anatomy. J Hand Surg [Am]. 2007; 32: 1225-1229 Abstract Full Text Full Text PDF PubMed Scopus (147) Google Scholar , 2 Bernstein A.D. Breslow M.J. Jazrawi L.M. Distal biceps tendon ruptures: a historical perspective and current concepts. Am J Orthop. 2001; 30: 193-200 PubMed Google Scholar , 3 DiChristina D.G. Lustig K.A. Rupture through the short head of the biceps muscle belly. A case report. Clin Orthop Relat Res. 1991; 277: 139-141 Google Scholar A recent case of a bifurcated distal biceps tendon demonstrating selective disruption of a single tendon bundle has been reported that was surgically confirmed and subsequently underwent successful primary repair. 4 Eames M.H. Bain G.I. Fogg Q.A. van Riet R.P. Distal biceps tendon anatomy: a cadaveric study. J Bone Joint Surg Am. 2007; 89: 1044-1049 Crossref PubMed Scopus (147) Google Scholar If the clinical scenario demands surgical restoration due to functional disability, then accurate preoperative detection is paramount because this injury may be confused with a partial thickness tear of a nonbifurcated distal biceps tendon or a distal musculotendinous junction strain, both which are typically managed conservatively.

Werkkenmerken, welzijn en organisatieprestatie: een toets van de happy-productive worker-hypothese op organisatieniveau

Work characteristics, well-being and organizational performance: an organizational-level test of the happy-productive worker hypothesis Work characteristics, well-being and organizational performance: an organizational-level test of the happy-productive worker hypothesis T.W. Taris, P.J.G. Schreurs, K.J.L. Eikmans & P. van Riet, Gedrag & Organisatie, volume 21, March 2008, pp. 3-18. The present study examined the associations among job characteristics (demands and control), worker well-being (satisfaction and exhaustion) and indicators of organizational performance (efficiency, absence rates, and client satisfaction) among 66 Dutch home care organizations. Based on previous research, we expected that demands would relate negatively and control would relate positively to well-being, and that positive well-being would be positively related to performance. Covariance structure modeling revealed that the expected relationships among job characteristics and well-being were largely confirmed. Further, satisfaction was positively related to client satisfaction; exhaustion was negatively related to client satisfaction and positively to absence; and exhaustion was negatively related to organizational efficiency. We conclude that more theorizing and more longitudinal research on the association between worker well-being and organizational performance is imperative to add to our understanding of this relationship.

Random recollections of some remarkable colleagues

When I returned to South Africa in 1936 after taking a degree in geology at Cambridge University, I envisaged a career in the mining world and had little idea that I was soon to be plunged into the exciting exploration of the past history of Man in this continent and to enjoy a long and happy association with such vital and inspiring men as Robert Broom, C. van Riet Lowe, Raymond Dart, Louis and Mary Leakey, Desmond Clark.

Lonergan and Gilson on the Problem of Critical Realism

The Thomist 69 (2005): 557-92 LONERGAN AND GILSON ON THE PROBLEM OF CRITICAL REALISM PAUL ST. AMOUR Saint Joseph's University Philadelphia, Pennsylvania WHEN THOMISTS have occasion to enumerate the many assets of the Thomistic tradition, especially vis-a-vis perceived skeptical and constructivist extremes of modern and postmodern thought, one attribute inevitably extolled is realism. Although generally parsimonious in circumscribing the limitations of human reason, Aquinas did affirm the capacity of the embodied human knower to know corporeal things beneath itself, to acquire self-knowledge, to affirm rationally the existence of God, and to speak some truth about the nature of God by way of negative and analogical predication. With the proviso that the proportionate object of the intellect in this life remains the quiddity of a material thing, Aquinas deemed the human intellect capable of knowing what really is, albeit partially and imperfectly . 1 Aquinas was always mindful of the fact that understanding and being are perfectly identified only in God, yet he affirmed that human inquiry could successfully attain a limited but veridical familiarity with being. While a commitment to realism is, and must remain, an indispensable feature of Thomism, establishing theoretical underpinnings for such a commitment has proven problematic in the modern philosophical context. To specify what justifies a commitment to Thomistic realism, or even to clarify precisely what realism entails, is to become involved in epistemological 1 Aquinas, Summa Theologica I, q. 84, a. 7; I, q. 85, a. 8; I, q. 87, a. 2, ad 2; I, q. 88, a. 3. 557 558 PAUL ST. AMOUR controversy. Bernard Lonergan once hinted that the doctrine of Thomistic realism is not as straightforward as it seems by making the somewhat unsettling observation that"Georg van Riet needed over six hundred pages [in L'epistemologie Thomiste (1946)] to outline the various types of Thomist epistemology that have been put forward in the last century and a half."2 Such an overview, if brought up to date, would of course be even more scandalously voluminous today. There are both philosophical and historical reasons for lack of a consensus regarding Thomistic realism. Lonergan has suggested that the issue is philosophically problematic because it is not possible adequately to determine the precise meaning and rational justification of realism without first resolving certain prior and more fundamental issues: What constitutes human knowing?3 What is being?4 How is being objectively known?5 It is a fact, however, that realists, even those sincere in their commitment to the realism of Aquinas, continue to differ on questions of cognition, being, and objectivity. The basic historical reason for a lack of doctrinal unanimity stems from the stubborn fact that Thomism has moved beyond the thirteenth century, not as some neatly arranged set of immutable propositions, but rather as a living philosophical tradition. The Thomistic tradition subsists and is mediated by the understandings and priorities of thinkers who are intellectually indebted to Aquinas, but who also happen to philosophize in cultural and intellectual contexts quite different from that of Aquinas himself. With regard to the issue of realism, some contemporary Thomists considered it worthwhile to bring Thomism into vital contact with the methods and difficulties of modern philosophy. While acknowledging the value of an historical retrieval of Aquinas's metaphysics of knowledge, they found it difficult simply 2 Bernard Lonergan, Insight: A Study ofHuman Understanding, vol. 3 of Collected Works of Bernard Lonergan, ed. Frederick E. Crowe and Robert M. Doran (Toronto: Toronto University Press, 1992), 433. 3 Ibid., 27-371. 4 Ibid., 372-78; 410-617. 5 Ibid., 399-409. LONERGAN, GILSON, AND CRITICAL REALISM 559 to ignore the modern inversion of the medieval priority of metaphysics to epistemology, or to dismiss as mere subjectivism the modern turn to the conscious subject. They were bothered by the fact that the Cartesian methodic doubt and the Kantian critique of knowledge tended to render precritical Thomistic realism vulnerable to the charge of na!ve realism. They took seriously the objection that it may be inadequate and dogmatic simply to present a Scholastic metaphysics of knowledge and posit its validity as realism in the absence of any further critical justification. Hence the renaissance of Thomism...

Load-Sharing at the Wrist Following Radial Head Replacement with a Metal Implant. A Cadaveric Study

To The Editor: I am writing with regard to the article entitled “Load-Sharing at the Wrist Following Radial Head Replacement with a Metal Implant. A Cadaveric Study” (2004;86:1023-30), by Markolf et al. The conclusion of Markolf and colleagues to “insert the thickest radial head implant possible” is, in my view, incorrect. Metallic radial head implants are currently in wide use and are effective for stabilizing the elbow and forearm after fracture-dislocation. However, the main drawbacks of metallic radial head implants include capitellar wear, lateral gapping of the ulnohumeral joint, and synovitis (see the case report by Van Riet et al.1 in the same issue of The Journal ). These are usually only a problem when the radial head implant is too large. The issue of whether radial head resection affects function of the wrist or distal radioulnar joint …

Drilling Technology: A Fully Automated System Accurately Controls Downhole Pressure During Drilling

This article, written by Assistant Technology Editor Karen Bybee, contains highlights of paper SPE 85310, "Development and Testing of a Fully Automated System to Accurately Control Downhole Pressure During Drilling Operations," by E.J. van Riet and D. Reitsma, SPE, Shell Intl. E&P, and B. Vandecraen, IPCOS, prepared for the 2003 SPE/IADC Middle East Drilling Technology Conference and Exhibition, Abu Dhabi, UAE, 20-22 October.

Diversity in mastic-mounted stone adzes and the use of mastic in precolonial South Africa: evidence from Steenbokfontein Cave

Composite tools and hafted tools were used world-wide over the last 35,000 years, and possibly earlier than that (Boëda et al. 1996; Holdaway 1996). Evidence for the use of composite tools in South Africa is provided by a small number of arrows from ethnohistorical and archaeological collections (Binneman 1994; Deacon & Deacon 1999: 158–9), a handful of mounted stone artefacts, and a significant number of mastic stained stone artefacts from archaeological sites (Deacon & Deacon 1999). On the basis of the limited sample of near intact mounted artefacts found in South Africa, it appears that small scrapers were side-mounted (at almost 90° to the axis of the handle) and fixed asymmetrically by surrounding resin (Deacon & Deacon 1980: 31–2). Adzes, on the other hand, were end-mounted (on one extreme, and along the same plane, of the handle) and held by a large ovoid lump of mastic (Hewitt 1921; Goodwin & Van Riet Lowe 1929: plate 42; Sampson 1974: figure 105). From their analysis of the available material two decades ago, Deacon & Deacon (1980: 37) concluded that the size and form of the insert was determined largely by the mode of hafting.

Approaching Helicobacter pylori infection in children: Level I evidence at last and a word of caution

Approaching Helicobacter pylori infection in children: Level I evidence at last and a word of caution

Linear elastic contact of the Weierstrass profile

A contact problem is considered in which an elastic half–plane is pressed against a rigid fractally rough surface, whose profile is defined by a Weierstrass series. It is shown that no applied mean pressure is sufficiently large to ensure full contact and indeed there are not even any contact areas of finite dimension — the contact area consists of a set of fractal character for all values of the geometric and loading parameters. A solution for the partial contact of a sinusoidal surface is used to develop a relation between the contact pressure distribution at scale n − 1 and that at scale n . Recursive numerical integration of this relation yields the contact area as a function of scale. An analytical solution to the same problem appropriate at large n is constructed following a technique due to Archard. This is found to give a very good approximation to the numerical results even at small n , except for cases where the dimensionless applied load is large. The contact area is found to decrease continuously with n , tending to a power–law behaviour at large n which corresponds to a limiting fractal dimension of (2 − D ), where D is the fractal dimension of the surface profile. However, it is not a ‘simple’ fractal, in the sense that it deviates from the power–law form at low n , at which there is also a dependence on the applied load. Contact segment lengths become smaller at small scales, but an appropriately normalized size distribution tends to a limiting function at large n . † The authors dedicate this paper to the memory of Dr J. F. Archard, 1918–1989.

Large-scale engineering geological mapping in the Spanish Pyrenees : Rengers, N; Soeters, R; van Riet, P A L M; Vlasblom, E Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6–10 August 1990V1, P235–243. Publ Rotterdam: A A Balkema, 1990

Large-scale engineering geological mapping in the Spanish Pyrenees : Rengers, N; Soeters, R; van Riet, P A L M; Vlasblom, E Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6–10 August 1990V1, P235–243. Publ Rotterdam: A A Balkema, 1990

Ecological planning proposal for Kruger National Park

This article discusses an application of the ecological planning model proposed by Van Riet and Cooks. The various steps outlined in this model have been applied to Kruger National Park in South Africa. The natural features of Kruger National Park, which form the basis of such an ecological planning exercise and from which the various land use categories, values, and zoning classes can be determined, are discussed in detail. The suitability of each of the various features is analyzed and a final zoning proposal for Kruger National Park is suggested. Furthermore a method for selecting a site for a new camp is illustrated by referring to the site for the new Mopane rest camp which is now under construction in the Kruger National Park.

Safety Standards for a 22-metre Deep-draught Route

The design of a route through Dover Strait to Europoort for very large carriers (VLCs) with a draught of up to 22 metres is described. The results are compared with established international safety criteria. A number of subjects for further study by institutes of navigation are mentioned. Van Riet (DG Shipping and Maritime Affairs), Kaspers (Public Works, North Sea Directorate) and Buis (Hydrographic Service, Royal Navy) participated in this design process. The views expressed, however, are those of the authors and not necessarily those of their organizations.Since 1974 deep-draught ships of up to 20·70 metres (68 feet) have been navigating the English Channel and the Dover Strait with destination Europoort in the Netherlands. To a lesser extent ships with these large draughts have been passing through the Strait with destinations in Scandinavian countries.

Designing a North Sea Shipping Route

This paper describes the process of developing a safe access route to the Hook of Holland. The traffic situation in the Roads was tested by means of simulation. Van Riet, Pollen and Valstar are with the Directorate General of Shipping and Maritime Affairs in the Netherlands, Tresfon with the Maritime Research Institute in the Netherlands.

Two-step assay of erythrocyte transketolase activity.

Journal Article Two-step assay of erythrocyte transketolase activity. Get access J C Leunis, J C Leunis Search for other works by this author on: Oxford Academic Google Scholar C Van Riet, C Van Riet Search for other works by this author on: Oxford Academic Google Scholar J Brauman J Brauman Search for other works by this author on: Oxford Academic Google Scholar Clinical Chemistry, Volume 28, Issue 2, 1 February 1982, Pages 391–392, https://doi.org/10.1093/clinchem/28.2.391 Published: 01 February 1982

Vibrational spectra of 1,1-dichloroethanes and βCH stretching interaction force constants

Infrared and Raman spectra are described and assignments are reported for CH 3CDCl 2 and CD 3CHCl 2, together with new i.r. data for CH 3CHCl 2 and CD 2HCHCl 2. Using previously obtained “isolated” CH stretching frequencies, the above data enable the trans and gauche stretch—stretch interaction force constants to be determined: f′ g = ±0.011, f′ t = ∓0.026 mdyn/Å. Similar values, f′ g = +0.016, f′ t = −0.029, may be obtained from the earlier spectra of CHD 2CHD 2 due to Van Riet. The relations between the fundamental deformation bands and their overtones and combinations are examined in order to estimate the accuracy of predictions of v s (= v 3) for the CH 3 and CD 3 groups from the 4 × 4 refinement and frequency sum rule. The data can be interpreted so as to give good agreement on the values of v O s of 2920 cm −1 (CH 3) and 2115 cm −1 (CD 3), provided that there are significance resonance shifts on both 2δ a and 2δ′ s levels. That this is the case seems to be true for the CD 3 group, but is uncertain for the CH 3 one.

Human Life: Some Moral Issues by John F. Dedek

BOOK REVIEWS ~43 I ask any interested reader to see whether Thomas says this. It is correct that Thomas uses intelligere in these passages but that does not mean that the operation is conception. The judicative function is an intelligere, as Julien Peghaire showed in Intellectus et Ratio (1986). For a recent review of this whole problem of the meaning of judgment in Aquinas, I would refer to Benoit Garceau, Judicium, vocabulaire, sources, doctrine de saint Thomas d'Aquin (Montreal-Paris, 1968). I would not accept all of Garceau's conclusions, but I think his survey of different interpretations is very complete. Doig does not list or use Garceau. The fact of the matter is that Doig approached his task with an obvious preconception. He is dead set against any suggestion that metaphysical esse is expressed or known in the judgment. Gilson and his associates are wrong on this point, in the view of Doig. Indeed, in the course of his discussion Doig disagrees with almost everyone in the Thomist establishment (Fabro, Forest, Geiger, Maritain, Marechal, Owens, Phelan, De Raeymaeker, Van Riet, and Van Steenberghen) except Charles Hart and Reginald Garrigou-Lagrange! What is important in Doig's mind is the concept of being, taken both essentially and existentially. His book should stand as an example of how not to interpret a philosophical classic. VERNON J. BoURKE St. Louis University St. Louis, Missouri Human Life: Some Moral Issues. By JoHN F. DEDEK. New York: Sheed & Ward, 197~. Pp. 180. $5.95. Dedek, professor of moral theology at St. Mary of the Lake Seminary in Mundelein, lllinois, offers a discussion of four moral issues profoundly affecting human life: abortion, genetic engineering, euthanasia, and war. His consideration of each of these questions is prefaced by a chapter on methodology, with attention centered on two principles: the sanctity of human life and the principle of double effect. Dedek contends that human life, although sacred and inviolable, is not an absolute value and that man's stewardship over human life implies a practical dominion, at least to the extent that man has the responsibility for making decisions regarding the termination of life. He then reviews some recent efforts at revising the principle of double effect and argues that the position taken by Bruno Schuller seems to be the most reasonable. For Schuller the principle of double effect does not rule out the direct intent to do something physically evil, e. g., killing a man, provided there is a proportionate reason which can serve as a "preference principle." In 244 BOOK REVIEWS such instances, Schuller and Dedek maintain, the evil intended and effected is only physical, not moral. After a chapter on the history of the attitudes of Catholic theologians toward abortion Dedek next surveys the views of contemporary moralists on this issue (e. g., Ramsey, Haring, Mangan) and offers his own view. He believes that the phenomenon of twinning makes it at least doubtful that human life is present until the end of the second or beginning of the third week of pregnancy. He then makes the tentative claim, justified by applying Schuller's preference principle, that " the purposeful destruction of a fetus is not a moral evil in the presence of a proportionate reason." Dedek, turning attention to problems posed by recent and proposed biomedical procedures, rejects artificial insemination by donor and cloning as too destructive of the human. He indicates, however, that artificial insemination by husband, artificial inovulation, the use of surrogate mothers, and artificial placentas may be morally permissible. The chapter on euthanasia gives readers a good survey of the views of men such as Ramsey, Fletcher, Ford, Healy, McFadden. Dedek argues that the distinction between active euthanasia (hastening death) and passive euthanasia (choosing not to use extraordinary means to prolong life) is valid. In a final chapter Dedek defends limited warfare as being morally justifiable, adopting for the most part arguments developed by Paul Ramsey. Dedek's work is an informative survey of current positions; the conclusions Dedek reaches are modestly proposed and defended by reasonable arguments. Nonetheless, in my opinion, Dedek's acceptance of Schuller's preference principle points to a trend current among many Catholic authors today (e. g...

The Role of Raw Material and the Concept of the Fauresmith

This paper is an attempt to get at the root of the development of the concept of the Fauresmith. Much has been said and written about this concept and it has become spread from the Cape to Kenya. This spread and the continued use of the term has been the result of intuitive comparisons between 'diagnostic tools' which have been considered 'typical' of the Fauresmith occurring in widely separated assemblages. No attempt has been made to describe the differences or similarities objectively. Assemblages that have been called 'Fauresmith' have been analysed from a more objective point of view (e.g. Mason, 1962) but the criteria by which they were regarded as 'Fauresmith' have never been made clear. The Fauresmith concept has been passed from worker to worker with varying degrees of subjective interpretation. In this paper only the original statements on the Fauresmith will be examined to see the nature of the basic concept, leaving alone the variations that have developed through time. This paper must in no way be regarded as a deprecation of the work of Goodwin & Van Riet Lowe on the Fauresmith their contribution to archaeology is too great to be affected by any critical review of one aspect of their work. However, prehistory is not a static discipline and its development is dependent upon constant revaluation and reinterpretation of evidence as this becomes necessary through the discovery of new evidence and by the application of new techniques. Any concept in prehistory only remains of use if it can hold its own in the face of new evidence and new approaches. The term 'Fauresmith' has been in use for over forty years and it is of interest to see what its role is today in terms of what is currently known about prehistoric cultures. It is with this idea in mind that the origins of the Fauresmith will be considered.

SHORT NOTICES

La Prière du Seigneur. By Heinz Schürmann. The Mother of God. Her physical Maternity: A Reappraisal. By Cletus Wessels. La Mystique et les Mystiques. By A. Ravier, S.J. and Others. Sous la direction de A. Ravier, S.J. Préface de Henri de Lubac, S.J. Summa Theologiae: St Thomas Aquinas; Latin text and English translation, introductions, notes Thomistic Epistemology. Vol. 2. By Georges van Riet. Translated by Donald. McCarthy, ph.d., and George E. Hertrich, m.a. Religious Psychology. By Vincent V. Herr, S.J. St Augustine and Being: A Metaphysical Essay. By James F. Anderson. The Coming of the Franciscans. By Thomas of Eccleston. Translated by Leo Sherley‐Price. The Roman Catacombs and their Martyrs. By L. Hertling and E. Kirschbaum. The Council of Chalcedon and the Armenian Church. By Karekin Sarkissian. Histoire du Concile de Trente, Vol. 1. By Hubert Jedin. Jewish Prayer and Worship: an Introduction for Christians. By William W. Simpson. Carnet de Notes. By Jacques Maintain. The German Church Conflict. By Karl Barth. Gilbert Foliot and his Letters. By Adrian Morey and C. N. L. Brooke.