The musculoskeletal sub-specialty deals with the muscles, bones, joints, and connective tissues of the lower limbs.

A clinician working with musculoskeletal care will often assess and manage conditions across varying client groups and ages, such as:

Heel pain (e.g., plantar fasciopathy/fasciitis).
Tendon injuries (e.g., Achilles tendinopathy).
Arthritis (e.g., rheumatoid or osteoarthritis).
Sports injuries (e.g., ankle sprains).
Running-Related Injuries (e.g., stress fractures).
Older Adults (e.g., falls prevention).

Clinicians working with musculoskeletal conditions may utilise various assessment and treatment modalities to manage these conditions, including;

Exercise prescription (e.g., strengthening exercises).
Load management (e.g., running programming).
Footwear
Strapping
Orthoses (aka orthotics, arch supports etc.)
Braces (e.g., ankle support braces).
Electrophysical therapies (e.g., shockwave, laser therapy etc.)
Injection therapies (e.g., cortisone, hydrodissection, PRP etc.).

The paediatric sub-specialty refers to the assessment and management of conditions that occur in children.

A clinician working within paediatrics will often work with/screen for the following conditions;

Toe walking (walking on the toes)
In-toeing / Out-toeing (feet turning in or turning out).
Foot deformities (e.g., club foot, curly toes).
Cerebral palsy
Hip Disorders (e.g., hip dysplasia - "clicky hips").
Nail conditions (ingrown toenails, curling nails).
Ingrown toenails and other nail problems.

Clinicians working within paediatrics often monitor developmental milestones to ensure a child is growing normally and to ensure early intervention if any concerns relating to a child's development does arise.

The dermatology sub-specialty refers to the assessment and management of skin and nail conditions of the feet and lower limbs.

A clinician working within dermatology and/or nail care will often work with the following conditions;

Fungal infections (e.g., tinea, fungal nails - onychomycosis). 
Corns and calluses
Blisters
Skin disorders (e.g., eczema or psoriasis).
Warts (aka verruca - plantar warts).