Treatment of Charcot Joint in Unstable Neuropathic Osteoarthropathy of the Foot — Sanders-Frykberg Type IV, V or Advanced Bone Destruction with Joint Instability
This protocol addresses Charcot joint in the specific setting of unstable Charcot neuropathic osteoarthropathy (CNO) of the foot, encompassing Sanders-Frykberg type IV or V involvement and advanced bone destruction with joint instability. These presentations represent a more severe stage of CNO and call for a structured, individualised management approach.
Clinical Scenario
Advanced CNO of the foot with joint instability — particularly Sanders-Frykberg type IV or V patterns — may occur in isolation or alongside concurrent diabetic foot ulcers and osteomyelitis. The degree of structural destruction and instability is the defining feature of this population and directly shapes the management pathway.
Treatment Approach — Partial Overview
The core of management involves foot offloading and immobilisation using an orthotic device, with the specific device type selected according to the extent of instability and the presence of concurrent foot complications. Nutritional supplementation may be added where a documented deficiency is identified.
Full device selection criteria, adjunct measures, and the complete management pathway are available via the link below.
Treatment Goals
Confirmed disease resolution requires a temperature difference of less than 2°C between corresponding foot locations sustained for 4–6 consecutive weeks, together with complete resolution of warmth, swelling, and erythema. Weight-bearing radiographs confirming the remodelling phase are required before inactive disease status is established.
References
DOI: 10.1007/s40266-025-01234-0
- Patients suffering from unstable CNO of Sanders-Frykberg types I-III, stable Sanders-Frykberg type IV, V or more advanced CNO destructions are empirically treated by Sarmiento orthoses-dynamic or non-dynamic.
- In some cases, however there is more advanced destruction of the foot combined with joints instability and not so rarely with diabetic foot ulcers and osteomyelitis.
- Dynamic Sarmiento orthoses completely offload the main weight bearing structures such as the talus, calcaneus, ankle joint or the whole foot.
- Non-dynamic Sarmiento orthoses, known as the Patellar Tendon Bearing (PTB) castings have also emerged as an effective offloading method, particularly for Charcot foot complicated by diabetic foot ulcers.
- Empirically, we recommend stabilizing the foot by a combination of a special contact splint with wheelchair.
- Treatment of CNO includes immobilization, offloading, recalcification (supplementation of vitamin D and calcium) and in the most advanced cases, surgical treatment.
- The average management time ranges from 2 to 12 months, with confirmed inactive Charcot diagnosis indicated by complete resolution of clinical signs/symptoms, temperature difference less than 2 degrees C at corresponding locations for 4-6 consecutive weeks, and weight-bearing x-rays confirming the remodelling phase.
- Modern diagnostic approaches increasingly incorporate temperature assessment (especially self-evaluation at home), with a temperature difference of less than 2 degrees C between corresponding locations on the two feet for 4-6 consecutive weeks serving as a criterion for inactive disease.
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