Biomedical subjects

I Oka

Publications and source records attributed to I Oka.

18 recordsLinked to original sources

PubMed1992

Anatomical study of preaxial polydactyly in 158 hands.

Preaxial polydactyly is a common congenital hand anomaly. Here in 138 patients with 158 duplicated thumbs, a new classification of this anomaly was done from analysis of radiographs and operation records. Initially all the duplicated thumbs were arranged into from Type I to VII on the basis of radiological extent of bifurcation. Appendage type was noted as a separate entity. Type IV was found the most common and had 53 thumbs (33.6%) involved. But findings on surgery indicated that the exact level of bifurcation varied in each type, and Type VII became three times as frequent as previously noted from x-ray examination at the time of surgery. Radiologically encountered duplications at IP (Type II), MP (Type IV) and CM (Type VI) joints were specifically classified into five groups from A to E on the basis of the structural changes detected on surgery. Details in each group were discussed.

Female↗

PubMed1992

Polydactyly of the foot: an analysis of 265 cases and a morphological classification.

Three hundred and thirty feet in 265 patients with polydactyly of the foot were classified on the basis of ray involvement and the level of duplication. Anatomic differences in bony structures according to x-ray and operative findings, external appearance of involved digits, associated anomalies, and familial incidence were studied. In medial-ray polydactyly, bilateral occurrence was common, and a higher frequency of associated anomalies was detected. Each involved foot with even the same level of duplication usually had a different morphologic pattern. In central-ray polydactyly, all patients except one had duplications of the second toe, commonly with unilateral involvement. Both components were underdeveloped, with delay in appearance of ossification areas. In two patients, each member of duplication had syndactyly with the neighboring toe, resembling the pattern of polysyndactyly-cleft hand complex. Lateral-ray polydactyl was classified into two new major groups based on ossification pattern and bony alignment: (1) fifty-ray duplication, referring to the medially duplicated supernumerary fifth toe, and (2) sixth-ray duplication, referring to the laterally duplicated supernumerary sixth toe. Fifth-ray duplication was much more frequent than sixth-ray duplication in the Japanese population. Many differences were noted between the two groups of lateral polydactyly. Syndactyly between the fourth and fifth toes was associated only with fifty-ray duplication. Ulnar polydactyly was associated only with sixth-ray duplication. In lateral polydactyly, every patient with bilaterally involved feet had similar groups of polydactyly bilaterally. All the patients in the same family also had similar groups of anomalies. These facts suggest independent etiologic mechanisms for each.

Child↗

PubMed1982