Clinical Application & Fitting Flashcards

A patient with a transtibial amputation using a vacuum-assisted socket suspension (VASS) reports that the vacuum alarm triggers frequently during activity. The clinician should first check:

Answer: Socket fit and liner integrity for air leaks

Frequent vacuum alarms indicate air is entering the system, most commonly due to a compromised liner seal, liner tears, or an ill-fitting socket.

When fabricating a custom AFO for a patient with mild spastic equinovarus, the trim lines should be:

Answer: Posterior to the malleoli to provide maximum rigidity

Posterior trim lines increase the rigidity of the AFO, providing necessary mediolateral stability and tone management for equinovarus deformity.

During assessment for a new transfemoral prosthesis, the clinician measures the patient's residual limb and notes a circumference decrease of 2 cm proximally since the last visit. This most likely indicates:

Answer: Significant volume loss requiring socket modification or replacement

A 2 cm circumference decrease proximally suggests significant residual limb volume loss, which compromises socket fit and requires socket modification or replacement.

Which combination of features characterizes an ischial containment socket (ICS) for a transfemoral amputation?

Answer: Narrow ML dimension with the ischium contained inside the socket walls

The ICS features a narrow mediolateral dimension that captures the ischium inside the socket, improving femoral adduction and proximal control.

A pediatric patient with myelomeningocele at the L4 level presents for orthotic fitting. The expected motor function preserved includes:

Answer: Hip flexion, knee extension, and partial foot dorsiflexion

L4 sparing preserves hip flexors, quadriceps (knee extension), and partial tibialis anterior function, giving dorsiflexion and some medial foot control.

A prosthetist notes that a patient's new exoskeletal (crustacean) prosthesis is cosmetically unacceptable due to visible misalignment of the pylon. In an endoskeletal (modular) system, this is addressed by:

Answer: Adjusting the alignment at the modular pyramid connector and replacing the soft cover

Endoskeletal systems allow alignment changes at the modular pyramid without full reconstruction; the soft cosmetic cover is then trimmed or replaced to match.

Which clinical finding during a static prosthetic alignment check for a transtibial amputee indicates that the foot is set in excessive toe-out?

Answer: The prosthetic limb abducts away from the midline when viewed from the front

Excessive toe-out in the foot placement causes the lower leg segment to angle laterally, creating apparent abduction of the prosthetic limb during stance.