Medial (hamate) facet of the lunate

Viegas, Steven F.; Wagner, Kathryn; Patterson, Rita M.; Peterson, Pamela D.

doi:10.1016/s0363-5023(09)90016-8

Cited by 242 publications

(137 citation statements)

References 15 publications

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“…Both are within the range reported in literature (Table II). Prevalence of Type II lunate varies in different populations with the highest prevalence of 73 % recorded by Viegas et al (1990) in Texas (USA) and the lowest of 26.7 % recorded by Dharap et al, (2005) in Malaysia (Table II). These differences may be due to varied ethnicities of the populations studied.…”

Section: Discussionmentioning

confidence: 97%

“…Observation of the distal articular Fifty-six (56) human wrists (34 left and 22 right) were analyzed in this study. The morphological types of lunate described by Viegas et al (1990) were observed.…”

Section: Methodsmentioning

confidence: 99%

“…A Type I lunate has one distal facet for articulation with the capitate while a Type II lunate has an additional facet medially for articulating with the hamate (Viegas et al, 1990;Nakamura et al, 2001;Dharap et al, 2006a). The prevalence of the Type II lunate ranges from 26.7 % to 73.3 % and shows population variation (Viegas et al, 1993, Dharap et al, 2006a.…”

Section: Introductionmentioning

confidence: 99%

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Morphology and Morphometry of the Distal Articular Surface of Lunate Bone in a Kenyan Population

et al. 2016

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SUMMARY:The morphology and morphometry of the distal articular surface of the lunate exhibits inter-population variations. They are of clinical importance to hand surgeons due to their influence on the occurrence of proximal pole arthrosis which is a cause of ulnar-side wrist pain. The objective of the study was to determine the morphology and morphometry of the distal articular surface of the lunate bone in an adult Kenyan population. A descriptive cross-sectional study at the Department of Human Anatomy, University of Nairobi. Fifty-six human hands obtained for routine dissection were used. The morphology of the distal articular surface of the lunate was classified as either Type I or Type II depending on the absence or presence of a medial facet for articulation with the hamate respectively. The width of the wrists and of the medial facet in Type II lunates was measured with SOMETTM CN-25 1234 vernier calipers (accurate to 1mm). Photomacrographs of representative lunate were taken. Data were analyzed using SPSS version 17.0. The Pearson correlation test was used to check for any correlations. Type II lunate morphology was more common with a prevalence of 34 (61 %) while 19 (34 %) were Type I. The mean width of wrists with Type I lunate was 41.1±2.8 mm while those with Type II had a mean width of 46.1±4.3 mm. The mean width of the medial facet in lunate type II was 4.4±1.4 mm. Lunotriquetral fusion was demonstrated in 3 (5 %) wrists. Prevalence of Type II lunate was higher than Type I. Wrists with a Type II lunate were wider than those with Type I. There was no correlation between the width of the wrist and the width of the medial facet of the lunate.

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Section: Discussionmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Morphology and Morphometry of the Distal Articular Surface of Lunate Bone in a Kenyan Population

et al. 2016

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“…Using a larger number of patients might possibly yield different results. Different scaphoid shapes have been reported, so it is possible that this variability could affect the shape of the central zone and the positional relationship of the long axis and the central zone [2,19,20].…”

Section: Discussionmentioning

confidence: 99%

Establishing a central zone in scaphoid surgery: a computational approach

Guo

Tian

Chen

et al. 2013

International Orthopaedics (SICOT)

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Purpose Scaphoid fractures are commonly fixed with headless cannulated screws positioned centrally in the scaphoid. Judgement of central placement of the screw may be difficult. We generated a central zone using computer analysis of 3D reconstructions of computed tomography (CT) images. As long as the screw axis is completely contained within this central zone, the screw would be considered as centrally placed. Methods Thirty cases of 3D CT reconstructions of normal scaphoids in a computerised operation planning and simulation system (Vxwork software) were obtained. The central zone was established after some distance shrinkage of the original scaphoid surface reconstruction model using the function "erode" in the software. The shape of the central zone was evaluated, and the width of the central zone in the proximal pole, waist portion and distal pole was measured. We also established the long axis of the scaphoid to see whether it stays in the central zone. Results All central zones could be divided into distal, waist and proximal portions according to the corresponding irregular shape of the scaphoid. As the geometry of the central zone was so irregular and its width very narrow, it was possible to completely contain the screw axis either in the proximal portion alone, waist alone or distal central zone alone. Conclusions Establishing the central zone of scaphoid 3D CT images provided a baseline for discussion of central placement of a scaphoid screw. The geometry of the scaphoid central zone determined that the screw could hardly be inserted through entire scaphoid central area during surgery.

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“…Ulnar variance (UV) is a good example of many author's attempt to show that the negative UV is playing a key role (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15), despite many normal individuals with a negative UV, that doesn't get KD (6) and many KD patients with positive UV (16). One of the theories that has repeatedly been proposed is the effect of lunate morphology in KD, either as an etiologic or a prognostic factor like Viegas and Zapico (15,17,18). Antuna-Zapico (A-Z) theorized that the proximal lunate morphology is being seen in 3 different shapes and the first type is the weakest one that collapses very soon in the course of the disease and UV positive is seen with type 3 (17, 18).…”

Section: Introductionmentioning

confidence: 99%