Diabetic toe ulcers: A comprehensive overview

Diabetic toe ulcers: A comprehensive overview

Diabetic foot ulcers (DFUs) are a significant complication of diabetes, with apical ulcers being one of the most challenging types. These ulcers, often located at the tips of the toes, are primarily caused by biomechanical abnormalities and repetitive pressure. This article delves into the causes, conservative treatments, and surgical management of apical ulcers, with a focus on percutaneous flexor tenotomy, a minimally invasive procedure that has shown excellent outcomes.

What Are Apical Ulcers?
Definition: Apical ulcers are neuropathic foot ulcers that occur at the distal tips of the toes. They are often associated with claw toe or hammertoe deformities, which increase pressure on the toe tips.

Causes
Neuropathy: Loss of protective sensation due to diabetic peripheral neuropathy leads to unrecognized repetitive trauma [1] [2].
Biomechanical Deformities: Toe deformities such as claw toe or hammertoe result in abnormal pressure distribution [3] [4].
Ill-Fitting Shoes: Tight footwear exacerbates pressure on the toe tips [2].

Conservative Treatments
Offloading Devices: Custom orthotics, padding, or toe spacers can redistribute pressure and reduce trauma [5] [2].
Wound Care: Regular debridement to remove necrotic tissue. Use of dressings that promote moist wound healing.
Infection Management: Antibiotics for infected ulcers. Monitoring for signs of osteomyelitis. While these measures can be effective, they often fail in cases involving severe deformities or persistent ulcers.

Surgical Management
Percutaneous Flexor Tenotomy: Percutaneous flexor tenotomy is a minimally invasive surgical procedure designed to relieve pressure on the distal toe by cutting the flexor tendons. This allows the toe to straighten, reducing pressure on the ulcer site and promoting healing.

Procedure Steps
Preparation: Local anaesthesia is typically used; however, it may not be necessary in insensate diabetic feet [3] [6].
Incision: A small stab incision (approximately 3 mm) is made at the base of the middle phalanx.
Tendon Release: The long flexor tendon is carefully severed using a scalpel while avoiding damage to neurovascular bundles [3] [6].
Post-Procedure: The wound is usually closed with one stitch or skin tape to heal primarily, and patients can immediately bear weight with proper offloading devices [3] [7].

Evidence Supporting Percutaneous Flexor Tenotomy
Healing Rates: Studies report healing rates of 92% to 100%, with most ulcers healing within 2-4 weeks [5] [6] [4].
Patient Satisfaction: High satisfaction rates due to rapid healing and minimal complications.
Patients appreciate the simplicity and effectiveness of the procedure [5] [4].
Complications: Rare but may include minor wound infections or residual deformities (e.g. hyperextension) [3] [6].

Recovery Process
Immediate Post-Operative Care: Patients can bear weight immediately but should elevate their foot for the first three days. Pain is minimal due to neuropathy but may require mild analgesics as anaesthesia wears off [7].
Wound Care: Dressings should be changed daily until complete healing. Normal shoes can typically be worn after three days [7].
Follow-Up: Regular follow-up ensures proper healing and monitors for complications like transfer lesions.

Success Rates and Long-Term Outcomes
Flexor tenotomy has proven to be an effective intervention for apical ulcers in diabetic patients with claw toe deformities:
Healing Rate: Up to 100% in some studies [5] [4].
Recurrence Rate: Very low when combined with simultaneous tenotomy of all affected toes to prevent transfer lesions [5].
Patient Outcomes: Improved quality of life due to ulcer resolution and reduced need for orthotic devices [3] [4].

Conclusion
Apical ulcers pose a significant challenge in diabetic foot care due to their association with structural deformities and high-pressure zones. While conservative measures remain important, percutaneous flexor tenotomy offers a highly effective surgical solution with excellent healing rates, minimal complications, and high patient satisfaction. This procedure should be considered part of standard care for diabetic patients with persistent apical ulcers unresponsive to conservative treatment.

Dr. Kim is a specialist in managing diabetic complications, providing expert care to help patients maintain their health and well-being. If you are experiencing complications related to diabetes, please contact our office to schedule a consultation.

 

Contact us today to book your consultation and take the first step toward pain-free feet.

 

1. https://iwgdfguidelines.org/wp-content/uploads/2019/05/IWGDF-Guidelines-2019.pdf
2. https://www1.racgp.org.au/ajg p/2020/may/diabetic-foot-ulcer
3. https://www.hmpgloballearningnetwork.com/site/wounds/article/6979
4. https://www.orthobullets.com/evidence/27478505
5. https://pubmed.ncbi.nlm.nih.gov/37109172/
6. https://pmc.ncbi.nlm.nih.gov/articles/PMC2386314/
7. https://www.londonfootankle.co.uk/foot-ankle-surgeon/flexor-tenotomy/

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