Rehabilitation challenges in orthotic offloading with dual disability involving bilateral lower limbs with right transtibial amputation for charcot joint, left neuropathic foot of hereditary motor and sensory neuropathy aetiology

Orthotic management of offloading neuropathic foot in hereditary motor and sensory neuropathy (HMSN) is challenging due to motor, sensory and functional deficits which may interfere with weight distribution over the foot. The challenge further becomes difficult with the involvement of the contralateral lower limb with below-knee amputation. This study is regarding challenges in offloading, weight transmission and distribution during the stance phase of gait in the case of a 35-year-old female with a left neuropathic foot due to HMSN with concomitant right transtibial amputation. The energy expenditure and cosmetic issues for the right lower limb and aiming for maximum functional conservation of the left foot, were considered by taking into account the heel pad thickness measured by musculoskeletal ultrasound, dynamic plantar pressure measured by footplate pressure measurement, the integrity of the ankle joint mobility and stability by clinical assessment, the electrophysiological status of the neuropathic foot by nerve conduction study and the weight-bearing capability of the right below-knee stump. The following management measures are planned for effective offloading with therapeutic footwear modification with silicone gel cushion heel and insole and rocker bottom outsole as an alternative to conventional weight-relieving calliper in a government tertiary care set-up, thereby conserving the foot function and morphology. This will help in planning a structured rehabilitation programme which will be beneficial in preventing future foot changes including trophic ulceration and subsequent amputation. Case follow-up after patient education and assessment of disease progression in each visit is being done. A better outcome in terms of quality of life and level of independent ambulation with concomitant bio-functionality of the left neuropathic foot was accomplished with community ambulation.