Kinematics of the wrist. I. An experimental study of radial-ulnar deviation and flexion-extension.

Youm, Youngil; McMurthy, R Y; Flatt, Adrian E.; Gillespie, T E

doi:10.2106/00004623-197860040-00001

Cited by 557 publications

(190 citation statements)

References 0 publications

Supporting

Mentioning

162

Contrasting

Unclassified

Order By: Relevance

“…The sequential positions of the leading edge of the head were recorded onto transparencies from the video monitor (Panasonic CTJ-2042R). The center of rotation of the turn was determined geometrically (Youm et al, 1978). Turning radius, R, and mean speed, U, were measured in m and m·s -1 , respectively.…”

Section: Discussionmentioning

confidence: 99%

Aquatic turning performance by the whirligig beetle: constraints on maneuverability by a rigid biological system

Fish

Nicastro

2003

Journal of Experimental Biology

105

View full text Add to dashboard Cite

SUMMARYTurning performance is constrained by morphology, where the flexibility of the body and the mobility and position of the control surfaces determine the level of performance. The use of paddling appendages in conjunction with the rigid bodies of aquatic arthropods could potentially limit their turning performance. Whirligig beetles (Coleoptera: Gyrinidae) are rigid-bodied, but these aquatic insects can swim rapidly in circular patterns. Turning performance of swimming whirligig beetles (Dineutes horni) was assessed by videotaping beetles in a small (115 mm diameter) arena at 500 frames s–1 and 1000 frames s–1. Curved trajectories were executed as continuous powered turns. Asymmetrical paddling of the outboard legs was used to power the turn. Turns were produced also by abduction of the inboard elytra and vectored thrust generated from sculling of the wing at 47.14 Hz. The abducted elytra increased drag and acted as a pivot. Swimming speeds varied from 0.06 m s–1 to 0.55 m s–1 (4.7–44.5 L s–1). Relative minimum radius was 24%of body length. Maximum rate of turn was 4428 degrees s–1 with maximum centripetal acceleration of 2.86 g. Turning radius was weakly associated with swimming velocity,although minimum values of the radius showed no correlation with velocity. Turning rate was also related indirectly to radius and directly to centripetal acceleration. Compared to vertebrates with flexible bodies, the relative turning radius of whirligig beetles is constrained by a rigid body and use of drag-based propulsive mechanisms. However, these mechanisms permit continuous turning, and the size of the beetle permits higher turn rates with lower centripetal accelerations.

show abstract

Section: Discussionmentioning

confidence: 99%

Aquatic turning performance by the whirligig beetle: constraints on maneuverability by a rigid biological system

Fish

Nicastro

2003

Journal of Experimental Biology

105

View full text Add to dashboard Cite

show abstract

“…The observation of a persisting restriction of the radial mobility has been reported in other studies [2,17]. One explanation for this might be that the radial adduction takes place mainly between the proximal and distal rows, while ulnar deviation is initiated both intercarpally and radiocarpally [21]. Various authors therefore recommend that styloidectomy be combined with PRC to avoid radial impingement.…”

Section: Discussionmentioning

confidence: 58%

Proximal row carpectomy—an adequate procedure in carpal collapse

Streich

Martini

Daecke

2006

International Orthopaedics (SICO

View full text Add to dashboard Cite

Proximal row carpectomy (PRC) is an established procedure in the treatment of advanced radiocarpal arthritis. The aim of this study was to evaluate the individual, functional and radiological results in relation to the initial diagnosis. Seventeen patients (15 men, two women), who had undergone PRC, were evaluated. Their average age at the time of the operation was 48 years (range 21-70 years). The most frequent diagnosis leading to PRC was scaphoid non-union advanced collapse (SNAC), which was observed in nine patients, while in three cases each the condition treated had been scapholunate advanced collapse (SLAC) and perilunate dislocation, and in two cases, Kienboeck's disease. At the time of the follow-up examination (median 65.41 months), a significant improvement in the range of movement was seen. While only four (36%) of the patients with SNAC had radiological signs of arthrosis of the radiocapitate joint, visible radiological involvement was noted in all patients who underwent PRC due to scapholunate dissociation and perilunate dislocation. The results of this study show that PRC is a good way of achieving long-term improvement of the degree of subjective freedom from symptoms and of the functional range of movement. Interruption of ligamentous structures, as in scapholunate dissociation and perilunate dislocation, seems to influence the radiological outcome.

show abstract

“…The percentage of patients in remission was assessed according to the ACR criteria for clinical remission [12] at each examination. Finally, articular destruction was assessed on a radiograph of the hands using Larsen's damage score (DS) [6] and the carpal height ratio (CHR: ratio of carpal height to length of the third metacarpal) [15] before operation and 3 years post-operation.…”

Section: Resultsmentioning

confidence: 99%

The anti-rheumatic effect of multiple synovectomy in patients with refractory rheumatoid arthritis

Nakamura

Nagashima

Ishigami

et al. 2000

International Orthopaedics

View full text Add to dashboard Cite

We assessed the anti-rheumatic effects of radical multiple synovectomy (RaMS) in patients with rheumatoid arthritis (RA) who did not respond to intensive medical treatment. The selection of patients into three groups, A, B or C, was randomised. Patients assigned to group A (n=28) continued the prescribed pre-operative medication and had RaMS. Patients assigned to group B (n=20) were started on a combination therapy with disease-modifying anti-rheumatic drugs (DMARDs) after radical multiple synovectomy. Nineteen RA patients who were started on the same combination therapy as group B but who did not undergo surgery served as controls (group C). The clinical and radiographic findings were assessed for at least 3 years after surgery. Patients in the surgically treated groups (groups A and B) showed a significant reduction in the number of swollen and painful joints and in their ESR and serum CRP levels, and this effect was maintained for at least 3 years. More than 40% of the patients remained in clinical remission during the observation period. The surgical outcome seemed to be superior to that of the controls and did not differ between group A and group B. Articular destruction (assessed by the carpal height ratio) did not progress in the patients who were in clinical remission.Résumé Nous avons étudié les effets anti-rhumatoïde de la synovectomie complète multiple dans trois groupes de patients atteints d'arthrite rhumatoïde réfractaire au traitement médical. La sélection des patients en trois groupes a été faite au hasard. Les patients du groupe A (n=28) ont continué le traitement pré-opératoire prescrit; ceux du groupe B (n=20) ont commencé, après l'intervention un traitement par médicaments anti-rhumatismaux. Enfin 19 patients qui ont commencé la même combinaison thérapeutique que le groupe B mais sans intervention chirurgicale ont servi de groupe de contrôle. Les patients ont été suivis au moins 3 ans après le traitement chirurgical. Les patients traités par synovectomie ont montré une réduction du nombre d'épanchement, de douleurs articulaires ainsi qu'une diminution de la vitesse de sédimentation et du niveau de la CRP ceci s'étant maintenu pour au moins 3 ans. Plus de 40% des patients sont restés en rémission clinique durant la période d'observation. Les destructions articulaires mesurées par la hauteur du carpe n'ont pas progressé pendant la période de rémission.

show abstract

Kinematics of the wrist. I. An experimental study of radial-ulnar deviation and flexion-extension.

Cited by 557 publications

References 0 publications

Aquatic turning performance by the whirligig beetle: constraints on maneuverability by a rigid biological system

Aquatic turning performance by the whirligig beetle: constraints on maneuverability by a rigid biological system

Proximal row carpectomy—an adequate procedure in carpal collapse

The anti-rheumatic effect of multiple synovectomy in patients with refractory rheumatoid arthritis

Contact Info

Product

Resources

About