5. Direct inguinal hernia Flashcards
INCIDENCE of Direct inguinal hernia
- Common in old males.
* 50 % bilateral
ETIOLOGY of Direct inguinal hernia
a. Weakness of lower abdominal wall muscles with chronic increased intra abdominal pressure.
b. Paralysis of conjoint tendon
Pathogenesis of Paralysis of conjoint tendon in ETIOLOGY of Direct inguinal hernia
Injury of the ilioinguinal nerve during appendectomy (only after muscle cutting).
PATHOLOGY & TYPES of Direct inguinal hernia
1 - Lateral Type “Commonest” :
2- Medial Type “Rare”
commonest type of Direct inguinal hernia
Lateral Type
Pathogenesis of Lateral Type of Direct inguinal hernia
- Bulges through the lateral part of Hasselbach’s triangle (made of fascia transversalis only).
- Thus has a very wide neck and is less liable to complications.
- Never descends to the scrotum.
Alternative name for Medial Type of Direct inguinal hernia
funicular form of Ogilvie
Pathogenesis of Medial Type of Direct inguinal hernia
Passes through a defect in the conjoint tendon in front of fascia transversalis in the medial half of the triangle.
- The edge of the defect is sharp & the neck is narrow )> liable to complicate.
- It may descend to the scrotum
Type of Direct inguinal hernia Passes through a defect in the conjoint tendon in front of fascia transversalis in the medial half of the triangle.
Medial Type of Direct inguinal hernia
Type of Direct inguinal hernia bulges through the lateral part of Hasselbach’s triangle (made of fascia transversalis only)
Lateral Type of Direct inguinal hernia
Type of Direct inguinal hernia has a very wide neck and is less liable to complications
Lateral Type of Direct inguinal hernia
Type of Direct inguinal hernia in which The edge of the defect is sharp & the neck is narrow and liable to complications
Medial Type of Direct inguinal hernia
Type of Direct inguinal hernia Never descends to the scrotum
Lateral Type of Direct inguinal hernia
Type of Direct inguinal hernia may descend to the scrotum
Medial Type of Direct inguinal hernia
the reason why Lateral Type of Direct inguinal hernia is less liable to complications
- Bulges through the lateral part of Hasselbach’s triangle (made of fascia transversalis only).
- Thus has a very wide neck and is less liable to complications.
the reason why Medial Type of Direct inguinal hernia is more liable to complications
Passes through a defect in the conjoint tendon in front of fascia transversalis in the medial half of the triangle.
- The edge of the defect is sharp & the neck is narrow )> liable to complicate.
Difference between Oblique inguinal hernia and Direct inguinal hernia by
Age
Side
Shape Descent Descent to scrotum Reducibility Complications
Internal ring test
External ring test
Relation of neck of sac to inferior epigastric artery
(at operation)
Age in Oblique inguinal hernia
Any Age
Age in Direct inguinal hernia
Usually old age
Side in Oblique inguinal hernia
Uni or bilateral
Side in Direct inguinal hernia
Usually bilateral
Shape in Oblique inguinal hernia
Oblong
Shape in Direct inguinal hernia
Hemisherical
Descent in Oblique inguinal hernia
Downwards, forwards and medially
Descent in Direct inguinal hernia
Forward
Descent to scrotum in Oblique inguinal hernia
May occur
Descent to scrotum in Direct inguinal hernia
Very rare
Reducibility in Oblique inguinal hernia
Upwards, backwards, and laterally
Reducibility in Direct inguinal hernia
Backwards
Complications in Oblique inguinal hernia
More common
Complications in Direct inguinal hernia
Less common
Internal ring test in Oblique inguinal hernia
Hernia does not protrude
Internal ring test in Direct inguinal hernia
Hernia protrudes
External ring test in Oblique inguinal hernia
Impulse at the tip of the finger
External ring test in Direct inguinal hernia
Impulse at the side
of finger
Relation of neck of sac to inferior epigastric artery
(at operation) in Oblique inguinal hernia
Lateral to the artery
Relation of neck of sac to inferior epigastric artery
(at operation) in Direct inguinal hernia
Medial to the artery
Internal ring test
- Steps
* Results
steps of Internal ring test
- Let the patient lies down.
- Reduce the hernia.
- Occlude the internal ring by the thumb of opposite hand (internal ring is 1/2 inch above the mid point of inguinal ligament ).
- Then ask the patient TO STAND UP and cough
Results of Internal ring test
- If hernia descends )> direct hernia.
* If hernia descends after release of thumb )> indirect hernia.
External ring test (not done)
- Steps
- Results
- The reason why it’s not done now
Steps of External ring test
Let the patient lies down & reduce the hernia.
Introduce the little finger into the inguinal through external ring and ask the patient to cough.
Results of External ring test
If impulse is felt at the tip )> indirect hernia
If impulse is felt at the side )> direct hernia
The reason why External ring test is not done now
a. Not a very sensitive test.
b. Painful.
c. Can stretch the external ring )> inguinal hernia can reach the scrotum
Zeiman’s 3 fingers test
The patient lies down then the hernia is reduced,
3 fingers are put as follows :
- One on the internal ring (for indirect hernia)
- One on the external ring (for direct hernia)
- And the third over the saphenous opening (for femoral hernia).
- The patient is asked to cough and you will see which finger receives the impulse first.