Flexor Hallucis Longus Muscle

This muscle is present on the backside of lower leg and is called FHL for short.

The name though large and sounds complicated but is self-explanatory. Flexor is a muscle that flexes or bends the body part, it is attached to; Hallucis refers to big toe and Longus defines its greater length compared to the other shorter flexor muscle of the big toe.

Location:

Flexor hallucis longus is present deep in the posterior compartment of the lower leg.It arises from the lower two third of the fibula, on its back. Fibula is the smaller of the two leg bones and is present on the outer side of the leg. A part of the muscle also arises from the connecting membrane present between tibia and fibula.

Diagram of the anatomy of the Flexor Hallucis Longus muscle

The muscle descends downwards and converts into a tendon (muscle to bone fibrous attachment). This tendon travels behind the inner bump of the ankle and goes under the foot. In the sole of the foot it runs, alongside the other flexor muscle of the big toe, the short one, called flexor hallucis brevis.

It finally inserts on the lower or under surface of the distal phalanx of the big toe. The big toe consists of two bones called phalanges. Distal phalanx is the one present towards the nail side of the toe.

Blood Supply:
Posterior tibial fibular vessels

Nerve Supply:
Tibial nerve S2, S3

Movements:
When flexor hallucis longus muscle contracts, its tendon pulls the lower surface of the big toe bone and therefore, bends the toe downwards.
It also acts to bend the foot downwards (plantarflexion) and twist it inwards (inversion).

Functions:

It helps to push off the surface during walking.
Injuries of flexor hallucis longus tendon are quite common in ballet dancers a condition termed as Dancer’s tendonitis. The reason being the dancer’s continuous and repetitive downward bending of the toes.





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THE KEY STEPS TO GETTING THE RIGHT SIZE DOCPODS:

FULL LENGTH INSOLES 

NON FULL LENGTH INSOLES 

1. Measure your existing shoe insole:

 1. Measure from your heel to ball of foot:


 

2. Then compare your measurements from above to match the product size charts below:
(you can trim to fit the insoles by approximately 1cm)


Docpods Regular Size Guide - for Slimline, 3 Quarter, Sports


  US UK EURO SLIMLINE 3 QUARTER  SPORTS 
Size  cm cm cm
Small  4-7  4-8  3-6.5  4-7.5  35-40 16  16.3  25.8
Medium  7-9   8-10  6-9  7-10  39-43  17.4 17.2  27.4
Large   9-13  10-14  8-12  9-13  42-47 19.3   18.2 29.4

Docpods Ultra Size Guide - for Ultra Soft

  XXS XS S M L XL
EURO  34  35.5-37.5  38-40  40.5-42  42.5-44  44.5-46.5
UK  2.5  3-4.5  5-6.5  7-8  8.5-9.5  10-12
US MENS  4-5  5.5-6  6.5-7.5  8-9  9.5-10.5  11-13.5
US WOMENS  3.5-5  5.5-7  7.5-9  9.5-10.5  11-12  13-14
LENGTH (cm) 23.2cm 24.9cm 26.2cm 28.8cm 30cm  31.2cm

Docpods Kids Size Guide - for Docpods Kids Fit only

  Size SPORTS  SLIMLINE
XXS 12-1  19.5cm 13cm 
XS 2-3 22.4cm  15.3cm 

Docpods Foot Pillow - Trim to Fit

  S L
US MENS  4.5 - 9  9 - 13
US WOMENS  6 - 10  10 - 14
LENGTH (cm) 26.5cm 29.2cm