What is a lumbrical plus deformity?
We report a case of paradoxical extension phenomenon of the little finger, so called “lumbrical plus deformity” due to repetitive trauma to the ulnar side of the palm. The adhesion between the flexor digitorum profundus tendon and the lumbrical muscle was the cause of this phenomenon.
What is lumbrical plus finger?
Normally contraction of the FDP pulls the FDP proximally but since it is disconnected, its proximal movement cannot flex the finger. Instead, the FDP pulls through the still-connected lumbrical muscle to flex the MP joints and extend the IP joints of the finger. This is called lumbrical-plus.
What do the lumbrical muscles do?
Abstract. The lumbrical muscles are unique in having their origin and insertion on tendons. The lumbricals assist in metacarpophalangeal joint flexion; they contribute to interphalangeal joint extension by acting as deflexors of the proximal interphalangeal joint.
How do you test lumbrical muscles?
The test for lumbrical muscle tightness must elicit the active recruitment of the FDP: Ask the patient to fully flex the fingers and when at end range ask the patient to tuck the fingertips tighter into flexion. Observe the DIP joints as the patient pulls at end range flexion.
What is the intrinsic plus position?
The intrinsic plus (or Edinburgh) position has otherwise been known as the safe position for hand splinting. The hand can be immobilized in this position for long periods of time without developing as much stiffness as would occur if the digits were positioned differently.
Is the lumbrical skeletal?
The lumbrical muscles, which get their name due to their worm-like appearance (lumbricidae – Latin = earthworm), are four short intrinsic muscles of the hand located between the metacarpal bones, deep to the palmar fascia….Lumbrical muscles of the hand.
| Origins | Tendons of flexor digitorum profundus muscle |
|---|---|
| Insertions | Extensor expansion of hand |
Is the lumbrical a skeletal muscle?
The lumbricals are four small skeletal muscles, accessory to the tendons of the flexor digitorum longus muscle.
Is the lumbrical voluntary?
Smooth muscle, which lines most of the hollow organs of the body, is not under voluntary control, but is regulated by the autonomic nervous system.
What muscles abduct the fingers?
The interossei muscles are intrinsic muscles of the hand located between the metacarpals. They consist of four (or three) palmar and four dorsal muscles that, respectively. These muscles are responsible for finger adduction and abduction.
What does Lumbrical mean in Latin?
earth worm
From Latin lumbrīcus (“earth worm”).
How is a lumbrical plus finger (Alf) diagnosed?
A lumbrical plus finger is characterized by paradoxical extension of the IP joints while attempting to flex the fingers. Diagnosis is made clinically with extension of the IP joints of one digit with attempted flexion of all fingers (making a fist). Treatment is observation if patient is minimally symptomatic.
What is the best approach to treat a lumbrical muscle tear?
A study from Germany, in the European Journal of Hand Surgery (2018) recommends the following approach to treating lumbrical muscle tears: In the case of a grade I tear, gentle pain-free stretching of the lumbricals is performed for 4-6 weeks followed by graduated loading.
What is a lumbrical muscle injury?
While only very small, the actions performed by the lumbricals are important for many functions of the hand, such as gripping movements. Lumbrical muscle injuries occur when a finger (middle/ring finger) is forcefully straightened while the other fingers are actively gripping/bent.
What are the lumbricals?
The lumbricals are four small muscles located between the metacarpal bones of the hand. While only very small, the actions performed by the lumbricals are important for many functions of the hand, such as gripping movements.