Where is the trim line located on a posterior leaf spring orthosis?

Where is the trim line located on a posterior leaf spring orthosis?

• A. Posterior to the malleoli
• B. Anterior to the malleoli
• C. Lateral to the malleoli
• D. Medial to the malleoli

Answer: (A)

A posterior leaf spring orthosis uses a thin, flexible set of leaves along the back of the ankle to store and release energy that helps lift the front of the foot during swing. Placing the trim line behind the malleoli (posterior to them) keeps the edge of the device out of the shin and ankle bone areas, prevents irritation or pressure on the malleolar prominences, and allows the posterior leaves to function freely to assist dorsiflexion. If the trim line were in front of the malleoli, it could press into the shin and impede the spring action; if it were too far to the medial or lateral sides, it could destabilize the fit and affect alignment. So, the trim line is located posterior to the malleoli.

A posterior leaf spring orthosis uses a thin, flexible set of leaves along the back of the ankle to store and release energy that helps lift the front of the foot during swing. Placing the trim line behind the malleoli (posterior to them) keeps the edge of the device out of the shin and ankle bone areas, prevents irritation or pressure on the malleolar prominences, and allows the posterior leaves to function freely to assist dorsiflexion. If the trim line were in front of the malleoli, it could press into the shin and impede the spring action; if it were too far to the medial or lateral sides, it could destabilize the fit and affect alignment. So, the trim line is located posterior to the malleoli.