Introduction to common injuries and surgery of the hand Flashcards
Where do the extrinsic and intrinsic muscles of the hand enter the hand and originate from?
- intrinsic = originate in hand and do not cross the wrist
- extrinsic = originate outside of the hand and cross the wrist
What is the palmar fascia, also called the palmar aponeurosis?
- a triangular structure in the palm of the hand based distally
- a continuation of the deep fascia of the forearm, especially the palmaris longus
What is the palmar fascia, also called the palmar aponeurosis, is also called by another name, what is this?
1 - valgus surface
2 - varus surface
3 - skin
4 - volar surface
4 - volar surface
There are 3 layers of the palmar fascia, what are they called?
1 - deep, middle and superficial
2 - lateral, medial and deep
3 - deep, anterior and posterior
4 - deep, middle and lateral
1 - deep, middle and superficial
There are 3 layers of the palmar fascia, where does the superficial layer attach?
1 - muscles of the hand
2 - epidermis of the skin
3 - dermis of the skin
4 - bones of the hand
- the dermis of the skin
There are 3 layers of the palmar fascia, where does the middle layer attach?
1 - metacarpophalangeal joint with longitudinal fibres
2 - carpal joint with longitudinal fibres
3 - proximal phalangeal joint with longitudinal fibres
4 - distal phalangeal joint with longitudinal fibres
1 - metacarpophalangeal joint with longitudinal fibres
- forms spiral bands
There are 3 layers of the palmar fascia, where does the deep layer attach?
1 - metacarpophalangeal joint with longitudinal fibres
2 - flexor and extensor mechanisms
3 - carpal joint with longitudinal fibres
4 - proximal phalangeal joint with longitudinal fibres
2 - flexor and extensor mechanisms
The palmar fascia enters the hand proximally from the palmaris longus tendon and merges with a ligament at the wrist. What is this ligament in the image called?
1 - extensor retinaculum
2 - flexor retinaculum
3 - palmar reticulum
4 - palmar aponeurosis
2 - flexor retinaculum
The palmar fascia enters the hand proximally from the palmaris longus tendon and merges with a ligament at the wrist. What happens to the palmer fascia when the palmaris longus muscle contracts?
- palmer fascia tightens
What is Dupuytren’s contracture?
1 - thickening of skin in palm of the hand and base of fingers
2 - thickening of palmar fascia in palm of the hand and base of fingers
3 - thickening of skin and palmer fascia in palm of the hand and base of fingers
4 - thickening of muscle tendons in pam of the hand and base of fingers
3- thickening of the skin and palmar fascia in the palm of your hand at the base of your fingers
Dupuytren’s contracture is a thickening of the skin and palmar fascia in the palm of your hand at the base of your fingers. Normal palmar fascia bonds thicken forming contracted tissue known as nodules, normally on the ulnar border. As these thicken and become larger they form what?
1 - bows
2 - strings
3 - cords
4 - bands
3 - cords
Dupuytren’s contracture is a thickening of the skin and palmar fascia in the palm of your hand at the base of your fingers. Normal palmar fascia bonds thicken forming contracted tissue known as nodules, normally on the ulnar border. As these thicken and become larger they form cords. This causes a progressive flexion contracture of the fingers. What joint in the hand is generally affected first?
1 - metacarpophalangeal joints
2 - proximal interphalangeal joint
3 - distal interphalangeal joint
4 - saddle joint
1 - metacarpophalangeal joints
- then spreads to the proximal interphalangeal joint
What fingers are normally affected in dupuytren’s contracture?
- little and ring finger
- sometimes the middle finger
Is dupuytren’s contracture more common in men or women?
- men
- 10:1 ratio
Which group of people are more likely to have dupuytren’s contracture?
1 - southern europeans
2 - asians
3 - northern europeans
4 - Americans
3 - northern europeans (Scandinavians)
- autosomal dominant (only need 1 abnormal allele)
Normal palmar fascia is composed of type I collagen. The disease pathophysiology of dupuytren’s contracture can be divided into proliferation, involutional changes and residual. In the proliferation stage what happens to the composition of the palmar fascia in dupuytren’s contracture pathophysiology?
1 - fibroblasts lay down type II collagen
2 - myofibroblasts lay down new muscle
3 - fibroblasts and myofibroblasts lay down new type 1 collagen
4 - fibroblasts and myofibroblasts lay down type III collagen
4 - fibroblasts and myofibroblasts lay down type III collagen
Normal palmar fascia is composed of type I collagen. The disease pathophysiology of Dupuytren’s contracture can be divided into proliferation, involutional changes and residual. In the involutional stage what happens to the palmer fascia once fibroblasts and myofibroblasts lay down type III collagen in the 1st stage (proliferation). What is the next step in the pathophysiology of dupuytren’s contracture?
1 - abnormal type III collagen aligns with skin
2 - abnormal type III collagen aligns with tendinous bands
3 - abnormal type III collagen aligns with muscles
4 - abnormal type III collagen aligns with ligaments
2 - abnormal type III collagen aligns with tendinous bands
Normal palmar fascia is composed of type I collagen. The disease pathophysiology of Dupuytren’s contracture can be divided into proliferation, involutional changes and residual. In the residual stage what happens to the palmer fascia once fibroblasts and myofibroblasts lay down type III collagen in the 1st stage (proliferation), which has then aligned with the lines of tension in the palm (2nd stage: involutional changes) forming scar tissue. As this scar tissue remains, what ultimately occurs with it?
1 - scar tissue aligns with flexor tendons, shortens and contracts
2 - scar tissue aligns with lumbricals, shortens and contracts
3 - scar tissue aligns with interossei, shortens and contracts
4 - scar tissue aligns with extensor tendons, shortens and contracts
1 - scar tissue aligns with flexor tendons, shortens and contracts
- as it aligns with flexor tendons, it causes flexion of the fingers
Is dupuytren’s contracture normally painful?
- no
- generally affects activities of daily living
Does dupuytren’s contracture affect active and passive flexion?
- yes
- unable to move it all all, or very little
For mild dupuytren’s contracture is there any non-operative treatments?
- no
- most patients will progress within 8 years and need surgery
If a patient is older has a mild version of dupuytren’s contracture, they may receive a percutaneous needle fasciotomy. What is this procedure?
1 - hand is opened up and cords are removed
2 - hand is opened using a small needle and cords are removed
3 - hand is opened using a small needle and cords are divided and cut
4 - hand is opened and tendons are removed to remove cords
3 - hand is opened using a small needle and cords are divided and cut
- fascia is divided NOT removed
If a patient is older has a mild version of dupuytren’s contracture, they may receive a percutaneous needle fasciotomy, which is where incisions are made and multiple cords are cut under local anaesthetic. Is this always 100% effective?
- no
- can commonly re-occur
For more serious versions of dupuytren’s contracture, there are a number of surgical options. What is open fasciotomy?
- open surgery
- bands are cut to be separated BUT not removed
- they are put in a splint and physio
- BUT there is a high occurrence rate
For more serious versions of dupuytren’s contracture, there are a number of surgical options. Fasciectomy, which is the GOLD STANDARD is the most common surgery. What is Fasciectomy?
- fibrous bands excising the bands
- limited fasciectomy is the gold standard for most cases
- skin closure can be a challenge.
For more serious versions of dupuytren’s contracture, there are a number of surgical options. What is dermo-fasciectomy?
- used for severe disease
- overlying skin and fascia are removed
- requires a skin graft
What is Dupuytren’s Diathesis?
- a very rare aggressive order in younger patients
- symmetrical affecting flexors on both hands, mainly radial side
- can affect all but the thumb
- strong family links
The extensors located in the posterior compartment of the forearm all contain their own tendinous sheaths, which is commonly views as 6 separate compartments of the posterior forearm. What are the 6 extensor compartments of the forearm?
1 - Extensor pollicis brevis and abductor pollicis longus
2 - Extensor carpi radialis longus and brevis
3 - Extensor pollicis longus
4 - Extensor indicis & extensor digitorum
5 - Extensor digiti minimi
6 - Extensor carpi ulnaris
The extensor pollicis longus hooks around a bony landmarks in the wrist, acting as a pulley and allows the muscle to extend the thumb. What is this bony landmark called?
1 - hook of hamate
2 - smiths tubercle
3 - lister’s tubercle
4 - guyons canal
3 - lister’s tubercle
There are 6 extensor compartments of the hand and forearm that are named based on their location. Compartment 1 is located on the radial border located close to the anatomical snuffbox. What is contained within compartment 1?
1 - abductor pollicis longus + extensor pollicis brevis
2 - extensor pollicis longus + extensor pollicis brevis
3 - abductor pollicis longus + extensor pollicis longus
4 - extensor pollicis longus + extensor digitorum
1 - abductor pollicis longus + extensor pollicis brevis
There are 6 extensor compartments of the hand and forearm that are named based on their location. Compartment 2 is located on the radial border deep to the anatomical snuffbox. What is contained within compartment 2?
1 - extensor carpi radialis longus + extensor pollicis brevis
2 - extensor carpi radialis longus + brevis
3 - abductor pollicis longus + extensor pollicis longus
4 - extensor pollicis longus + extensor digitorum
2 - extensor carpi radialis longus + brevis
There are 6 extensor compartments of the hand and forearm that are named based on their location. Compartment 3 contains the third muscle of the thumb that is not contained with compartment 1 (abductor pollicis longus + extensor pollicis brevis). What is contained within compartment 3?
1 - extensor carpi radialis longus
2 - extensor carpi radialis longus
3 - abductor pollicis longus
4 - extensor pollicis longus
4 - extensor pollicis longus
There are 6 extensor compartments of the hand and forearm that are named based on their location. Compartment 4 is located on the middle of the forearm and contains the extensors of the fingers. What are the 2 muscles contained within compartment 4?
1 - extensor digitorum + extensor pollicis brevis
2 - extensor carpi radialis longus + extensor indices
3 - extensor digitorum + extensor indices
4 - extensor pollicis longus + extensor digitorum
3 - extensor digitorum + extensor indices
There are 6 extensor compartments of the hand and forearm that are named based on their location. Compartment 5 is located laterally to compartment 4 and includes 1 muscle. What muscle is contained within compartment 5?
1 - extensor digitorum
2 - extensor carpi radialis longus
3 - extensor digitorum
4 - extensor digiti minimi
4 - extensor digiti minimi
There are 6 extensor compartments of the hand and forearm that are named based on their location. Compartment 6 is located laterally to compartment 5 and includes 1 muscle. What muscle is contained within compartment 6?
1 - extensor digitorum
2 - extensor carpi ulnaris
3 - extensor digitorum
4 - extensor digiti minimi
2 - extensor carpi ulnaris
DeQuervain’s tenosynovitis is an inflammatory problem affecting the tendon sheath of compartment 1 of the extensor compartments of the hand. What muscles are therefor affected that are located most radially?
1 - abductor pollicis longus + extensor pollicis brevis
2 - extensor pollicis longus + extensor pollicis brevis
3 - abductor pollicis longus + extensor pollicis longus
4 - extensor pollicis longus + extensor digitorum
1 - abductor pollicis longus + extensor pollicis brevis
- 2 most lateral tendons of the anatomical snuffbox