(n.) A plane figure bounded by four right lines, of which no two are parallel.
(n.) A bone of the carpus at the base of the first metacarpal, or thumb.
(n.) A region on the ventral side of the brain, either just back of the pons Varolii, or, as in man, covered by the posterior extension of its transverse fibers.
Example Sentences:
(1) The authors describe three patients in whom this complication occurred after Silastic replacements of the carpal scaphoid and trapezium bones.
(2) The wrist motion remaining after simulated arthrodeses was as follows: capitate-hamate: flexion (Flx) 98%, extension (Ext) 92%, ulnar deviation (UD) 96%, radial deviation (RD) 90%; scaphoid-lunate: Flx 97%, Ext 91%, UD 90%, RD 91%; scaphoid-trapezium-trapezoid: Flx 86%, Ext 88%, UD 67%, RD 69%; scaphoid-lunate-triquetrum: Flx 91%, Ext 82%, UD 86%, RD 70%; capitate-lunate: Flx 70%, Ext 59%, UD 89%, RD 79%; capitate-hamate-triquetrum: Flx 88%, Ext 79%, UD 88%, RD 81%; hamate-triquetrum: Flx 90%, Ext 85%, UD 89%, RD 94%; scaphoid-trapezium-trapezoid-capitate: Flx 85%, Ext 77%, UD 64%, RD 57%.
(3) Twenty-five patients who presented with symptoms of disabling pain secondary to arthritis at the base of thumb had 29 arthroplasties with silicone rubber trapezium implants.
(4) Although the design features of the Niebauer implant offer theoretical advantages for stability and fixation, this study does not demonstrate better results compared with other types of silicone trapezium implants.
(5) Operation, consisting of resection of the trapezium and shortening by 1.5 cm of the abductor pollicis longus tendon was performed on 16 thumbs.
(6) If there is localized uptake in the area of the trapezium, additional radiographic studies may be necessary to confirm or exclude this fracture.
(7) The fracture of the trapezium can prevent the normal mobility of the thumb, and therefore an anatomical reduction is desirable.
(8) Osteoarthritic involvement of more than one of the articular surfaces of the trapezium was found in a group of 31 hands.
(9) The area under each sensitivity gradient was determined using the trapezium rule.
(10) The first point of reference is fixed and consists of a line projected through the radial articular surface of the second metacarpal with the trapezium.
(11) Trapezium-scaphoid-trapezoid subluxations and trapezoid-capitate-scaphoid-trapezium subluxations or dislocations are rare.
(12) The present study deals with patients in whom the diagnostic procedures applied in rhizoid arthrosis were considered to reveal scaphoid-trapezium-trapezoid (STT) arthrosis.
(13) We studied 18 patients ranging in age from 16 years to 57 years who presented 8 to 78 months (average, 31.7 months) after silicone arthroplasty (four scaphoid, six lunate, one scapholunate, four finger, two wrist, one trapezium, and one ulnar head for metacarpal hemiarthroplasty).
(14) Fractures of the body of the trapezium are uncommon.
(15) After excision of the trapezium, a strip from the flexor carpi radialis was wound around the main portion of the flexor carpi radialis tendon and the abductor pollicis longus.
(16) The patients treated by resection of the trapezium and tendon interposition were more satisfied and had less pain than those treated by implantation of a Swanson prosthesis.
(17) Having performed 100 anatomical dissections we found that in the first dorsal compartment of the wrist besides other tendons there are one or two tendons belonging to a musculo-tendinous unit, not yet described, inserting in the trapezium and acting almost together with the other units going to the first metacarpal.
(18) Excision of the trapezium gave good results with respect to pain relief, but there was loss of thumb stability and strength.
(19) Relationships between the younger, single members of staff were purest catnip to us; we were always turning love triangles into love trapeziums.
(20) The physio-pathology of fractures of the trapezium was investigated by personal experiments conducted in the laboratory on 26 wrists and showed 3 main mechanisms: a fall on the hand with the wrist extended and radially deviated (Manon) and direct commissural trauma combined with various degrees of shearing described by Monsche.
Trapezoid
Definition:
(n.) A plane four-sided figure, having two sides parallel to each other.
(n.) A bone of the carpus at the base of the second metacarpal, or index finger.
(a.) Having the form of a trapezoid; trapezoidal; as, the trapezoid ligament which connects the coracoid process and the clavicle.
(a.) Of or pertaining to the trapezoid ligament; as, the trapezoid line.
Example Sentences:
(1) Proenkephalin A-related immunoreactive neuronal perikarya were detected in the central gray, reticular formation, nucleus raphes, trapezoid body, nucleus parabrachialis lateralis and medialis, nucleus spinalis nervi trigemini, nucleus dorsalis nervi vagi, and in the nucleus tractus solitarii.
(2) From the tissue distribution of 800 microCi MAb E48, the absorbed cumulative radiation doses of tumour and various organs were calculated using the trapezoid integration method for the area under the curve.
(3) The responses of afferents were further studied using sinusoidal and trapezoidal stimuli aligned as closely as possible with the orientation of their response vector.
(4) The trapezoidal shape of the vertebrae and scarring of the soft tissues within the concavity made correction difficult.
(5) From plasma drug concentration-time data, best estimates for the bioavailability parameters of peak plasma phenobarbital concentration (Cmax) and time to peak concentration (tmax) were obtained by curve fitting and area under the plasma drug concentration-time curve (AUC) computed with the trapezoid rule.
(6) At low pH, it is theorized that the trapezoidal profile of the dimer is shifted to a more rectangular configuration such that flat ribbons are formed by the lateral association of dimers.
(7) DYN B cell bodies were present in nonpyramidal cells of neo- and allocortices, medium-sized cells of the caudate-putamen, nucleus accumbens, lateral part of the central nucleus of the amygdala, bed nucleus of the stria terminalis, preoptic area, and in sectors of nearly every hypothalamic nucleus and area, medial pretectal area, and nucleus of the optic tract, periaqueductal gray, raphe nuclei, cuneiform nucleus, sagulum, retrorubral nucleus, peripeduncular nucleus, lateral terminal nucleus, pedunculopontine nucleus, mesencephalic trigeminal nucleus, parabigeminal nucleus, dorsal nucleus of the lateral lemniscus, lateral superior olivary nucleus, superior paraolivary nucleus, medial superior olivary nucleus, ventral nucleus of the trapezoid body, lateral dorsal tegmental nucleus, accessory trigeminal nucleus, solitary nucleus, nucleus ambiguus, paratrigeminal nucleus, area postrema, lateral reticular nucleus, and ventrolateral region of the reticular formation.
(8) Degenerative changes in the scapho-trapezial-trapezoidal (ST) joint may occur as an isolated process or more frequently as a dominant part of pantrapezial degenerative joint affections.
(9) The majority of units were recorded in the ventral component of the trapezoid body.
(10) They can be summarized as: mesial shifting of the maxilla, dimensional increase of the mandibular body, ovoidal upper arch with a deeper palatal vault, tapering or trapezoidal lower arch.
(11) The AUC-integrated concentration was significantly higher than the AUC-trapezoid.
(12) Principal cells in the medial nucleus of the trapezoid body (MNTB) are believed to be critical components in the circuit subserving sound localization.
(13) The lowest threshold values for current strength, energy and charge were observed when defibrillating the heart by means of rectangular impulses and especially by trapezoidal impulses with ascending slope.
(14) That means that rectangular or trapezoidal impulses with an ascending slope may be most conveniently used for cardiac defibrillation.
(15) Two femoral neck fractures ten years following Trapezoidal-28 THA have recently been referred to our clinic.
(16) Therefore, the velocity profile is "trapezoidal" rather than parabolic at all times during the pulsation period.
(17) Trapezoidal and triangular gradient lobe shapes are analyzed.
(18) The authors report a case of posterior dislocation of the trapezoid bone together with the second metacarpal.
(19) The wrist motion remaining after simulated arthrodeses was as follows: capitate-hamate: flexion (Flx) 98%, extension (Ext) 92%, ulnar deviation (UD) 96%, radial deviation (RD) 90%; scaphoid-lunate: Flx 97%, Ext 91%, UD 90%, RD 91%; scaphoid-trapezium-trapezoid: Flx 86%, Ext 88%, UD 67%, RD 69%; scaphoid-lunate-triquetrum: Flx 91%, Ext 82%, UD 86%, RD 70%; capitate-lunate: Flx 70%, Ext 59%, UD 89%, RD 79%; capitate-hamate-triquetrum: Flx 88%, Ext 79%, UD 88%, RD 81%; hamate-triquetrum: Flx 90%, Ext 85%, UD 89%, RD 94%; scaphoid-trapezium-trapezoid-capitate: Flx 85%, Ext 77%, UD 64%, RD 57%.
(20) The trapezoid compression frame is recommended as an alternative to conventional methods of treating unstable fractures and dislocations of the pelvic girdle.