COF COF Diabetic & Therapeutic Footwear 5 — Questions and Answers
Question 1: A patient with diabetes and a forefoot amputation (ray resection of the 4th and 5th rays) is best served by which shoe filler strategy?
- Custom filler prosthesis that occupies the amputated space and distributes load (Correct answer)
- Standard prefabricated foam insert without modification
- Shoe stretching at the lateral forefoot only
- Wide-toe box shoe with no insert
Correct answer: Custom filler prosthesis that occupies the amputated space and distributes load
A custom filler prosthesis occupies the void left by the ray resection, redistributes plantar pressure, and prevents the remaining toes from drifting.
Question 2: Which condition DISQUALIFIES a diabetic patient from the Medicare therapeutic shoe benefit even if they have diabetes mellitus?
- Patient is institutionalized and footwear is provided by the institution (Correct answer)
- Patient has peripheral neuropathy
- Patient has a history of foot ulceration
- Patient has peripheral arterial disease
Correct answer: Patient is institutionalized and footwear is provided by the institution
Medicare excludes patients who are residents of a skilled nursing facility or other institution that is responsible for providing such footwear as part of the covered stay.
Question 3: A rocker-sole modification is PRIMARILY indicated to achieve which biomechanical goal in diabetic footwear?
- Reduce peak plantar pressure by facilitating toe-off without metatarsophalangeal joint flexion (Correct answer)
- Increase ankle dorsiflexion range of motion
- Improve lateral ankle stability
- Enhance proprioceptive feedback in insensate feet
Correct answer: Reduce peak plantar pressure by facilitating toe-off without metatarsophalangeal joint flexion
A rocker sole allows the foot to roll through the gait cycle without requiring MTP joint flexion, thereby reducing peak pressures under the metatarsal heads.
Question 4: When evaluating a diabetic patient for therapeutic footwear, which vascular finding should prompt immediate referral prior to fitting?
- Ankle-brachial index (ABI) below 0.5 indicating critical limb ischemia (Correct answer)
- ABI of 0.9 with palpable pedal pulses
- Mild dependent rubor resolving with elevation
- Venous insufficiency with mild pitting edema
Correct answer: Ankle-brachial index (ABI) below 0.5 indicating critical limb ischemia
An ABI below 0.5 indicates critical limb ischemia requiring vascular surgical consultation before any orthotic or footwear intervention.
Question 5: Which shoe last design feature is MOST important when fitting a diabetic patient who has significant bunion deformity (hallux abductovalgus)?
- Combination last with a wide forefoot and narrower heel (Correct answer)
- Straight last with equal width throughout
- Negative-heel last to shift weight posteriorly
- Tapered toe box last for a slim forefoot profile
Correct answer: Combination last with a wide forefoot and narrower heel
A combination last accommodates the wide forefoot deformity of a bunion while maintaining a snug heel fit to prevent pistoning.
Question 6: Per the Therapeutic Shoe Bill, which healthcare provider is NOT authorized to certify the medical need for diabetic footwear?
- Certified Orthotic Fitter (COF) acting as certifier (Correct answer)
- Doctor of Medicine (MD)
- Doctor of Osteopathic Medicine (DO)
- Doctor of Podiatric Medicine (DPM)
Correct answer: Certified Orthotic Fitter (COF) acting as certifier
A COF is a qualified supplier who may fit and dispense diabetic footwear but cannot serve as the certifying physician — only MDs, DOs, or DPMs may certify.
Question 7: A diabetic patient presents with a Grade 2 Wagner ulcer (deep ulcer to tendon/capsule without abscess or osteomyelitis). What is the MOST appropriate orthotic footwear recommendation at this stage?
- Total contact cast (TCC) or removable cast walker (RCW) rather than standard therapeutic shoes (Correct answer)
- Extra-depth shoe with a custom insert to offload the ulcer
- Sandal with a padded metatarsal dome
- Standard therapeutic shoe with a rocker sole only
Correct answer: Total contact cast (TCC) or removable cast walker (RCW) rather than standard therapeutic shoes
A Grade 2 Wagner ulcer requires aggressive offloading via a total contact cast or removable cast walker; standard therapeutic shoes are insufficient at this wound depth.
COF COF Diabetic & Therapeutic Footwear 5
A patient with diabetes and a forefoot amputation (ray resection of the 4th and 5th rays) is best served by which shoe filler strategy?