Hip Disarticulation And Pelvic Flashcards
During stance phase on the prosthetic side, the weight line passes medial to the point of support in the socket: directly under the ischium. This creates a moment, which will cause the pelvis to tilt towards the sound side. Because of this,
The M/L support in the socket is provided by the illium on the sound side.
Static alignment of a hip disarticulation prosthesis in the sagittal plane has:
A line drawn between the hip joint axis and the knee joint axis should intersect with the ground approximately 1.5 inches posterior to the heel.
The theoretical weight line begins at the point in the socket 1” anterior to the ischial tuberosity. It extends vertically to the ground passing 1/2” anterior to the knee center and intersects with the ground at approximately 7/16” : anterior to the center of the prosthetic foot.
True
During the casting of a hip disarticulation patient, supportive blocks are placed on the anterior and posterior. Surfaces of the affected side. The ankle of the blocks should be identical to the hip joint attachment plate. The anterior block can be placed with an angle of:
5-10 degrees of external rotation with respect to the line of progression
The anterior trim lines for the sound side thigh should extend no more than 1” distal to the ASIS.
True
During swing phase the weight of the prosthesis is borne over the illium.
True
The Canadian style prosthesis uses a two-piece socket design as compared to the UCLA style which uses a one-piece socket design.
False
The coronal placement of the hip joint should be 10 mm lateral to the midline of the socket.
False
Prosthetic knee joint flexion is initiated by pressure on the posterior brim of the socket and a posterior tilting of the pelvis.
True
Prosthetic toe clearance is accomplished, in part, by hip hiking on the prosthetic side.
True
