Facioscapulohumeral muscular dystrophy (FSHD) is the third most common muscular dystrophy, caused by epigenetic derepression of the DUX4 gene. The name describes its classic distribution -- facial muscles, scapular stabilisers, and humeral (upper arm) muscles are affected first. However, lower limb involvement is more common and more disabling than the name suggests, and it is lower limb weakness that ultimately determines whether a person with FSHD needs a walking aid.
Lower Limb Involvement in FSHD
FSHD lower limb weakness follows a specific pattern:
- Tibialis anterior: Weakness of the anterior compartment of the leg causes foot drop -- often asymmetric, with one leg affected before the other. This is one of the most common reasons for a cane in FSHD
- Hip girdle muscles: Hip abductors, hip extensors, and hip flexors are variably affected. Weakness of the hip abductors produces a Trendelenburg gait (lateral trunk shift over the weight-bearing hip)
- Periscapular muscles (upper body): While not directly involved in walking, scapular winging affects the ability to use a cane effectively -- if the shoulder girdle is too weak to apply downward pressure through a cane, a forearm crutch is more appropriate
Asymmetric Weakness: A Critical FSHD Feature
Asymmetry is a defining characteristic of FSHD. One leg is frequently significantly weaker than the other, and this creates gait patterns that standard bilateral-weakness advice does not address. Key implications:
- Foot drop that is unilateral may be managed with a single ankle-foot orthosis (AFO) on the affected side, which may reduce or eliminate the need for a cane
- Asymmetric hip weakness requires the cane on the contralateral side to the weaker hip to compensate for Trendelenburg pattern
When a Cane Is Appropriate in FSHD
- Unilateral or bilateral foot drop where an AFO is insufficient or not tolerated
- Hip abductor weakness causing Trendelenburg gait with lateral trunk shift and fall risk
- Fatigue-related gait deterioration on longer distances (FSHD fatigue is often underappreciated)
Upper Limb Weakness and Cane Handle Considerations
If scapular stabilisers and upper arm muscles are involved, pushing down through a conventional cane handle may be mechanically inefficient or painful (unstable shoulder girdle cannot generate downward force through the hand effectively). The DaiWalk Anatomic Grip requires less compensatory shoulder and elbow stabilisation than a T-bar because the palm contact surface is positioned in alignment with the forearm axis -- but if upper limb involvement is significant, a physiotherapy assessment of the most appropriate aid type is warranted.
FSHD Features and Cane Implications
| FSHD Feature | Gait Impact | Cane/Aid Recommendation |
|---|---|---|
| Tibialis anterior weakness (foot drop) | Steppage gait, toe trip | AFO first; cane as adjunct for balance and fatigue |
| Hip abductor weakness (Trendelenburg) | Lateral trunk shift, fall risk | Cane contralateral to weaker hip |
| Asymmetric lower limb involvement | Compensatory gait mechanics | Cane contralateral to more affected limb |
| Scapular/shoulder girdle weakness | Reduced ability to load through hand | Forearm crutch preferred over conventional cane |
Related: Walking Cane for Muscular Dystrophy | Walking Cane for Foot Drop. Explore DaiWalk walking canes.
