Pro-Corn - O&P Library

Figure 12. Oblique ML (OB), medial-lateral diameter
measurement for Narrow ML Socket. 5
Figure 13. Ischial Tuberosity ML (IT), mediallateral
diameter measurement for Narrow ML
Socket. 5
generously above the trochanter. Although, not
as exaggerated as the UCLA CAT-CAM, the
medial wall is lowered as it approaches the anterior
wall, allowing for the pubic ramus to
pass from within the socket.
Alignment follows generally accepted quadrilateral
alignment principles for TKA and knee
bolt external rotation. For alignment in the
frontal plane (posterior view, ML plane), Mr.
Shamp advocates the principles of Long's Line.
Dr. Hans Lehneis, C.P.O., of the Rusk Institute
of Rehabilitation Medicine was the next
speaker and his presentation covered work done
at the Rusk Institute and the New York Veterans
Administration. Dr. Lehneis and associates
are investigating anatomical, physiological,
and biomechanical characteristics of geriatric
above-knee amputees in an attempt to
develop a set of design criteria for geriatric
above-knee sockets. As this project is still in
the developmental stages, I will not elaborate
on this subject.
Following Dr. Lehneis was Ossür Kristinsson
of Iceland. As the developer of the
flexible socket-rigid frame system, he was the
first to speak on flexible sockets. Mr. Kristinsson
reported that he was continuing development
of flexible sockets, including walls and
brims. He is conducting an extensive materials
search in hopes of finding the materials that
will make possible the ultimate flexible socket
design.
Mr. Kristinsson went on to say that we need
some simple definition of flexible socket characteristics.
"To label a socket as flexible, I
would say that you should be able to deform it