Dart-throwing motion in patients with scapholunate instability: a dynamic four-dimensional computed tomography study

2013 ◽  
Vol 39 (4) ◽  
pp. 346-352 ◽  
Author(s):  
M. Garcia-Elias ◽  
X. Alomar Serrallach ◽  
J. Monill Serra
Keyword(s):  
Computed Tomography ◽  
Computer Tomography ◽  
Frontal Plane ◽  
Scapholunate Ligament ◽  
Ligament Repair ◽  
Scapholunate Instability ◽  
Radial Styloid ◽  
Dart Throwing ◽  
Midcarpal Joint ◽  
Throwing Motion

When the normal wrist rotates along the ‘dart-throwing’ plane, the proximal row remains still, with most motion occurring at the midcarpal joint. Whether this behaviour is maintained when the scapholunate ligaments are torn is not known. If this is the case, patients having a scapholunate ligament repair could benefit from early dart-throwing exercises without the risk of pulling the sutures apart. Using dynamic computer tomography, we analysed the carpal behaviour of six normal wrists and six wrists with scapholunate instability during dart-throwing motion. In the normal wrists, the scaphoid and lunate did not flex or extend, but translated along the frontal plane an average 5.9 and 5.6 mm, respectively. When the scapholunate ligaments were torn, the scaphoid shifted towards the radial styloid considerably more than the lunate (12.8 mm versus 4.8 mm; p = 0.005), inducing a scapholunate gap. Based on these findings, we cannot recommend dart-throwing exercises after scapholunate ligament repair, unless the joint is stabilized with wires or screws.

Scapholunate Ligament Repair and Capsulodesis for the Treatment of Static Scapholunate Dissociation

1998 ◽  
Vol 23 (6) ◽  
pp. 776-780 ◽  
Author(s):  
J. D. WYRICK ◽  
B. D. YOUSE ◽  
T. R. KIEFHABER
Keyword(s):  
Grading System ◽  
Scapholunate Ligament ◽  
Scapholunate Dissociation ◽  
Ligament Repair ◽  
Wrist Motion ◽  
Normal Side ◽  
Scapholunate Instability ◽  
Clinical Grading ◽  
Radiographic Grading

Twenty-four patients were treated with scapholunate ligament repair and dorsal capsulodesis for scapholunate dissociation. Seventeen patients were available for follow-up at an average of 30 months. The average interval between injury and surgery was 3 months. At final follow-up, no patients were pain-free. Average total wrist motion was 60% and grip strength 70% of the opposite normal side. The average preoperative scapholunate angle was 78° and was corrected to a normal 47° at surgery. The average final scapholunate angle was 72°, which was not significantly different from the preoperative value. The scapholunate gap likewise was not significantly changed postoperatively. Only two patients had an excellent or good outcome using a clinical grading system, and six out of 17 scored good or excellent using a radiographic grading system. In conclusion, repair of the scapholunate ligament with dorsal capsulodesis failed to provide consistent pain relief and maintain carpal alignment in patients with static scapholunate instability.

scholarly journals Po laivelio pseudoartrozės įvykusio riešo kolapso eiga ir gydymas

2003 ◽  
Vol 1 (4) ◽  
pp. 0-0
Author(s):  
Arūnas Jankauskas
Keyword(s):  
Treatment Plan ◽  
Scaphoid Nonunion ◽  
Scapholunate Ligament ◽  
Carpal Collapse ◽  
Complete Excision ◽  
Joint Surfaces ◽  
Degenerative Arthrosis ◽  
Three Stages ◽  
Midcarpal Joint ◽  
Midcarpal Arthrodesis

Arūnas JankauskasVilniaus universiteto Ortopedijos, traumatologijosir plastinės chirurgijos klinikaVilniaus greitosios pagalbos universitetinė ligoninėŠiltnamių g. 29, LT-2043 VilniusEl paštas: [email protected] Esant nestabiliai laivelio pseudoartrozei, riešo sąnarys neišvengiamai deformuojasi, prasideda artrozė ir sumažėja sąnario aukštis. Tokia riešo sąnario būklė vadinama riešo kolapsu. Degeneraciniai pokyčiai pasireiškia varginamais skausmais, kontraktūra ir plaštakos jėgos susilpnėjimu. Artrozė prasideda ties stipinkaulio yline atauga ir pasiekusi antrą stadiją išplinta stipininiame laivelio sąnaryje. Trečios stadijos artrozė pažeidžia riešo vidurinį sąnarį, tačiau stipininis mėnulio sąnarys lieka nepakitęs. Dėl antros ir trečios stadijos artrozės išplitimo rekonstruoti laivelį netikslinga. Reikia likviduoti artrozės židinius ir stabilizuoti riešo sąnarį taisyklingoje padėtyje. Pašalinamas laivelis ir atkuriamas riešo aukštis. Atliekama riešo vidurinio sąnario artrodezė. Stipininio mėnulio sąnario judesiai išsaugomi. Prasminiai žodžiai: laivelio pseudoartrozė, riešo kolapsas, riešo vidurinio sąnario artrodezė Scaphoid nonunion advanced collapse: development and treatment plan Arūnas Jankauskas Longstanding and untreatet scaphoid nonunion leads to painful destruction of the wrist with carpal collapse (scaphoid nonunion advanced collapse). The severity of degenerative arthrosis is classified into three stages and can be treated operatively. The reconstruction of the scaphoid or scapholunate ligament in stages II and III is not a reasonable option. With complete excision of the scaphoid and fusion of the midcarpal joint, all arthritic joint surfaces are eliminated and motion is preserved in the radiolunate joint, which is usually spared of degenerative changes. Keywords: scaphoid nonunion, carpal collapse, midcarpal arthrodesis

scholarly journals PERIPROSTHETIC BONE DENSITY CHANGES EVALUATION USING COMPUTED TOMOGRAPHY

2005 ◽  
pp. 072-076
Author(s):  
Fidele Likibi ◽  
Michel Assad ◽  
Christine Coillard ◽  
Gilles Chabot ◽  
Charles-H. . Rivard
Keyword(s):  
Computed Tomography ◽  
Bone Density ◽  
Computer Tomography ◽  
Lumbar Fusion ◽  
Titanium Implant ◽  
Density Variation ◽  
Periprosthetic Bone ◽  
Sheep Model ◽  
Post Implantation

The aim of this study was to examine the effect of the presence of two types of metallic intervertebral lumbar fusion implants (a porous nitinol and a hollow titanium cylindrical implants) in the implant peripheral tissue after 3, 6 and 12 months post-implantation in a lumbar sheep model in order to evaluate and compare the biofunctionality and biocompatibility of both implants. 19 sheep were used to evaluate this bone density variation using computer tomography (CT). 16 of them received both implants at either level L2–L3 or L4–L5 and 3 other non-treated animals were used as controls. Results indicated that PNT obtained a superior biofunctionality that the conventional titanium implant. However, the biocompatibility of porous nitinol seemed comparable to that of titanium – a well-known long-term implant material.

SCAPHOID TRANSLATION MEASUREMENTS IN NORMAL WRISTS

Hand Surgery ◽  
2013 ◽  
Vol 18 (02) ◽  
pp. 179-187 ◽  
Author(s):  
Ronit Wollstein ◽  
Frederick W. Werner ◽  
Roee Rubenstein ◽  
Christopher R. Nacca ◽  
Richard A. Bilonick ◽  
...  
Keyword(s):  
Random Error ◽  
Precise Measurement ◽  
Scapholunate Ligament ◽  
Radius Fractures ◽  
Ligamentous Injury ◽  
Ulnar Deviation ◽  
Radial Styloid ◽  
Normal Measure ◽  
Indirect Evaluation

The purpose of this study was to establish a normal measure of scaphoid position in the radioulnar plane in standard neutral, radial and ulnar deviation posteroanterior radiographs. This measurement may allow indirect evaluation of the radiocarpal ligaments and comparison between normal and pathologic states (following radius fractures, perilunate dislocations). Measurements were trialed on 74 normal wrist radiographs and 25 cadaver wrists. We evaluated the distance between the radial styloid and the scaphoid and corresponding scaphoid width. The ratio of distance/width at the mid styloid level (0.35, imprecision SD = 0.1) had the lowest random error and is therefore the most precise measurement of true scaphoid translation. This measurement is independent of scapholunate ligament integrity and may provide a better assessment of the radiocarpal component of ulnar translational instability. Abnormal movement of the scaphoid in the radioscaphoid joint likely reflects ligamentous injury. Identifying and addressing these injuries may prevent the development of arthritis.

Three-dimensional kinematics of the lunate, hamate, capitate and triquetrum with type 1 or 2 lunate morphology

2017 ◽  
Vol 43 (4) ◽  
pp. 380-386 ◽  
Author(s):  
Shingo Abe ◽  
Hisao Moritomo ◽  
Kunihiro Oka ◽  
Kazuomi Sugamoto ◽  
Kenji Kasubuchi ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Wrist Joint ◽  
Three Dimensional ◽  
Wrist Flexion ◽  
Ulnar Deviation ◽  
Dart Throwing ◽  
Carpal Kinematics ◽  
Throwing Motion

The purpose of this study was to investigate the differences in three-dimensional carpal kinematics between type 1 and 2 lunates. We studied 15 instances of wrist flexion to extension (nine type 1, six type 2), 13 of radial to ulnar deviation (seven type 1, six type 2), and 12 of dart-throwing motion (six each of type 1 and 2) in 25 normal participants based on imaging with computerized tomography. Mean proximal translation of the distal articular midpoint of the triquetrum relative to type 2 lunates during wrist radioulnar deviation was 2.9 mm (standard deviation (SD) 0.7), which was significantly greater than for type 1 lunates, 1.6 mm (SD 0.6). The hamate contacted the lunate in ulnar deviation and ulnar flexion of wrists with type 2 lunates but not with type 1. We conclude that the four-corner kinematics of the wrist joint are different between type 1 and 2 lunates.

Use of computed tomography data for forensic identification of an individual

2020 ◽  
Vol 6 (4) ◽  
pp. 41-45
Author(s):  
Sergey V. Leonov ◽  
Julia P. Shakiryanova
Keyword(s):  
Computed Tomography ◽  
Computer Tomography ◽  
Soft Tissues ◽  
Three Dimensional ◽  
Reference Points ◽  
Forensic Identification ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
The Face ◽  
Tomography Data

Background: The article presents our own experience of using computer tomography for identification of individuals with known results. Aims: The aim of the study was to verify the possibility of performing an identification study using a three-dimensional model obtained from computed tomography of the head. Identification was performed using a three-dimensional model of the head, based on computer tomography sections made in various projections, with a step of 1.231.25 mm. Two-dimensional images of the face (photos) were used for comparison. All comparative studies were conducted using approved methods of craniofacial and portrait identification: by reference points and contours. The experiment used a computer program that allows you to export DICOM-files of computed tomography results to other formats (InVesalius), as well as computer programs that directly work with the research objects (Autodesk 3ds Max, alternative programs Adobe Photoshop, Smith Micro Poser Pro). Results: In the course of research, it was found that, having computer tomography data of the head, it is possible to conduct identification studies on the following parameters: on the reconstructed three-dimensional model of the soft tissues of the face, on the three-dimensional model of the skull (craniofacial identification), on the features of the structure of the ear. Conclusion: Positive results were obtained when comparing objects, which makes it advisable to use them in practical and scientific activities.

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