Extensor Digitorum Longus (EDL) Anatomy


This muscle is present on the outer front of the lower leg. The name though sounds difficult but clearly defines the muscle. Extensor= muscle that extends, Digitorm= the digits of the foot (the small toes) and longus= because it is relatively longer than the other extensor of the digits.

Location:
It is present in the anterior compartment of lower leg and originates from both the lower leg bones tibia and fibula.
It arises from the upper end of tibia (lateral condyle), from the upper end and front surface of fibula and also from the membrane present between both these bones.

Diagram of the anatomy of the Extensor Digitorum Longus

It travels downwards on the front of the lower leg and near the ankle turns into a tendon (white fibrous band of connective tissue that attaches a muscle to bone). This tendon further split into four parts, each of which runs towards the corresponding toe.

Each part inserts on the upper surface of the corresponding toe bones. Each small toe consists of three bones arranged in a line. These bones are called phalanges. The tendon inserts into the middle and end (present under the nail) phalanges.

Blood Supply:
Anterior tibial vessels

Nerve Supply:

Fibular (Peroneal) nerve

Movements:
•   When it  contracts, this muscle pulls all the small toes upwards i.e. extends the second, third, fourth and fifth toe.
•   It also twists the foot outwards (eversion of the foot).
•   It bends the ankle upwards (dorsiflexion of the ankle).

Functions:
This muscle extends the small toes while walking or while climbing stairs to help the toes avoid the steps.
Its action can also be noticed as one extends the toes to cut the nails.





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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