Search PubMed⌕ Search

Biomedical subjects

E Horii

Publications and source records attributed to E Horii.

43 records · Page 3Linked to original sources
PubMed1990

Effect on force transmission across the carpus in procedures used to treat Kienböck's disease.

A simplified two-dimensional articulating force analysis (rigid body spring model) examined how different surgical procedures used for treating Kienböck's disease modify the force distribution across the carpus. A two-dimensional model of a carpus was loaded through the metacarpals by forces of up to 143 Newtons. The resulting intercarpal displacement and joint loadings were calculated for the intact wrist and for different simulated surgical procedures. The predicted total amount of force transmitted through the radio-lunate joint of the intact wrist averaged a 32% of the total radio-ulno-carpal joint load. Limited intercarpal fusions were found to reduce compressive loading at the radio-lunate joint by no more than 15% of the original load. Capitate shortening was successful in relieving radio-lunate forces, however, it dramatically overloaded the adjacent scapho-trapezial and triquetral-hamate joints. By contrast, a 4 mm lengthening of the ulna (or shortening of the radius) resulted in a 45% reduction of radio-lunate load with only moderate changes in force at the midcarpal and radio-scaphoid joints. On the basis of this study, radial shortening or ulnar lengthening significantly unload the lunate and are rationale procedures in the treatment of Kienböck's disease. Limitations regarding direct clinical application of this mathematical model are also discussed.

Analysis of Variance↗
PubMed1990

Congenital hand anomalies in Japan: a family study.

During the 20-year period from 1968 to 1987, 1024 patients with congenital anomalies of the hand from 1000 Japanese families were examined in our clinic. Of these patients, 204 had relatives with limb anomalies. While postaxial polydactyly showed a 33% level of familial recurrence, symphalangism and Kirner's syndrome showed about 23% recurrence, syndactyly 18%, radioulnar synostosis 9%, radial ray deficiency 8%, cleft hand 7%, and duplicated thumb 5%. None of the relatives had ulnar deficiency or symbrachydactyly.

Hand Deformities, Congenital↗
PubMed1990

Three cases of syndactyly, polydactyly, and hypoplastic triphalangeal thumb: (Haas's malformation).

Three cases of a complex malformation of the hand involving syndactyly, polydactyly, and hypoplastic triphalangeal thumb are presented. In all three patients, six metacarpal bones and hypoplasticity of the thenar muscles were present. In one patient, both hands, except the most radial digits of the left hand, were completely fused by soft webs as reported by Haas and Ofodile. In two other patients, the extent of the webs differed from Haas's case, but one of them was similar to Ofodile's first case. In all instances the supernumerary digit had a triphalangeal configuration and the thenar muscles were hypoplastic, often associated with some degree of webbing.

Adult↗
PubMed1989

Three-dimensional CT imaging for wrist disorders.

Three-dimensional CT imaging of the wrist was performed in 20 patients: three with Kienböck's disease, 14 with fractures or dislocations of the carpal bones, two with dislocation of the distal radio-ulnar joint and one with an intra-articular fracture of distal radius. These images were compared with those of plain radiographs and computed tomography. With the exception of two cases of distal radio-ulnar joint dislocation and one case of hamate body fracture, three-dimensional CT imaging was helpful in detecting the displacement of the fracture and in determining the location and the direction of the displaced carpal bone. Furthermore, the presence of small fragments could be observed more easily in the three-dimensional CT image. Three-dimensional CT imaging provides a great deal of information that cannot be obtained by conventional radiographs or CT images even at their present stage of technical development.

Adolescent↗
PubMed1987

Reduction of the scaphoid fracture with DISI alignment.

Eight cases of symptomatic malunion and nonunion of scaphoid fractures with dorsiflexed intercalated segment instability (DISI) alignment were treated by open reduction, anterior wedge-shaped bone grafting, and internal fixation using Herbert's screw. In four malunited fractures, osteotomy at the fracture line was done before the reduction. The DISI alignment was reduced by insertion of the Kirschner wire into the lunate and flexing it anteriorly. After the bone grafting to the anterior bony defect of the scaphoid, which was created by the Kirschner wire reduction, internal fixation was accomplished by the use of Herbert's screw. In all cases fusion was obtained within 4 months. Radiographic assessment indicated that the DISI alignment and the angulated scaphoid were corrected to achieve a nearly normal pattern. Pain, restricted motion of the wrist, and the grip strength were improved.

Adolescent↗
PubMed1987

Nonoperative treatment of camptodactyly.

Twenty-four patients with camptodactyly of their small fingers were treated with a dynamic splint. Most of the patients could extend the proximal interphalangeal (PIP) joints within a few months by using the dynamic splint 24 hours a day. After almost full extension of the proximal interphalangeal joint was achieved, splinting for 8 hours a day produced good final results. However, after the splint was removed, contracture tended to recur. Although further studies are needed to determine the optimum termination of treatment, in our opinion it should be when the growth plate is closed, and longitudinal growth of the finger no longer occurs.

Adolescent↗