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At least 1,315 records · Page 73Linked to original sources
PubMed1979

[Stereoscopic photography in plastic surgery (author's transl)].

A major problem in reconstructive and plastic surgery of the face is the assessment of exact distances between certain points of reference across facial contours. Incorrect estimation of these variables produces unsatisfactory postoperative anatomical results. Therefore a method, which permits exact measurements using stereoscopic photography of models, was tested. On the models quantitative studies of the effects of surgical techniques were made. Facial asymmetry and various phases of facial animation can be assessed and documented, and the progress of expanding tumours can likewise be followed.

Adult↗
PubMedDate not supplied

Mobility in the lumbosacral spine after fusion studied with the aid of roentgen stereophotogrammetry.

Twelve cases operated upon with fusion in the lumbosacral spine were studied with a roentgen stereophotogrammetric method. With this method the movements in the area supposed to be fused can be studied with high accuracy in 3 dimensions. The precision is 0.3 degrees for the rotation about the x-axis (transversal axis), 0.2 degrees for the rotation about the y-axis (longitudinal axis), and 0.1 degrees for that about the z-axis (sagittal axis) and of the magnitude of 0.1 mm for the translations. It was found that the possible stabilization of a fusion takes place within 180 days. The supposed gain of internal fixation with a sacral bar device was not verified. It was recommended that the supine and erect standing positions should be investigated and compared with this method and that standing with flexion should be added as soon as the healing process is supposed not to be injured by flexion movements.

Adolescent↗
PubMed1982

Periductal elastic tissue of breast cancer. Quantitative histologic study.

Using techniques of stereology, we estimated the relative volume of periductal elastic tissue in 60 infiltrating ductal carcinomas of the breast. Volume density of periductal elastic tissue in the neoplasm correlated with our own subjective histologic estimates of the amount of elastic tissue. Periductal elastic tissue had a significantly higher volume density in the neoplasm than in nonneoplastic breast, but the two estimates did not correlate with each other. Similarly, the volume density of elastic tissue in the neoplasm did not correlate with that of neoplastic cells or of stromal collagen in the neoplasm, degree of lymphocytic infiltration, lymph node metastasis, mortality, menstrual status, age, parity, or presence or levels of estrogen receptor protein in the neoplasm. On the other hand, parity correlated with the volume density of periductal elastic tissue in the nonneoplastic parenchyma of the breast. Our findings indicate that there are at least two separate elastogenic effects in infiltrating ductal carcinoma of the breast: that exerted by parity on nonneoplastic tissue and that exerted by cancer itself on the neoplasm.

Adult↗
PubMed1983

Gait analysis--precise, rapid, automatic, 3-D position and orientation kinematics and dynamics.

A fully automatic optoelectronic photogrammetric technique is presented for measuring the spatial kinematics of human motion (both position and orientation) and estimating the inertial (net) dynamics. Calibration and verification showed that in a two-meter cube viewing volume, the system achieves one millimeter of accuracy and resolution in translation and 20 milliradians in rotation. Since double differentiation of generalized position data to determine accelerations amplifies noise, the frequency domain characteristics of the system were investigated. It was found that the noise and all other errors in the kinematic data contribute less than five percent error to the resulting dynamics.

Gait↗