Related Experiment Video
Updated: Mar 28, 2026
09:26
The Knob Supination Task: A Semi-automated Method for Assessing Forelimb Function in Rats
Published on: September 28, 2017
9.7K
Knuckle pads - a rare finding
Giorgio Tamborrini1, Michael Gengenbacher1, Stefano Bianchi1
1Department of Rheumatology and Musculoskeletal Ultrasound, Bethesda Hospital, Basel, Switzerland.
Journal of Ultrasonography
|December 18, 2015
Summary
Knuckle pads are benign skin growths that appear as lumps on the finger joints. Ultrasound and histology confirm the diagnosis and help differentiate them from other joint conditions.
Area of Science:
- Dermatology
- Rheumatology
- Radiology
Background:
- Knuckle pads are rare, benign subcutaneous nodules.
- They require differentiation from joint diseases and other soft tissue masses.
Observation:
- A case of a 36-year-old woman with bilateral knuckle pads on the dorsal proximal interphalangeal joints.
- No underlying musculoskeletal disorder was identified.
Findings:
- Ultrasound revealed well-defined, hypoechoic subcutaneous masses without vascularity.
- Histology showed myofibroblast proliferation and reduced elastic fibers in the dermis.
Implications:
- This case highlights the diagnostic utility of ultrasound and histology for knuckle pads.
- Understanding these findings aids in differentiating knuckle pads from other dorsal finger swellings.
More Related Videos
Related Concept Videos
01:15Bones of the Upper Limb: Ulna
10.6K
The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side...
10.6K
01:09Bones of the Upper Limb: Radius
10.9K
The radius is longer of the two bones that make up the human antebrachium or forearm. At the proximal end, the radius articulates with the capitulum of the humerus and the radial notch of the ulna to form the elbow joint. At the distal end, the radius articulates with the ulna via the ulnar notch, forming the distal radioulnar joint. Distally, the radius also attaches to the carpal wrist bones (scaphoid and lunate) to form the radiocarpal joint.
The radius has a nail-shaped head, and a...
The radius has a nail-shaped head, and a...
10.9K
01:22Spinal Nerves: Plexus I
3.5K
Nerve plexuses are networks of interlacing nerves that serve as communication hubs to distribute and organize nerve action across various body regions. The nerve plexuses are organized into the cervical plexus located in the neck region, brachial plexus in the shoulder area, lumbar plexus found in the lower back, sacral plexus situated in the pelvis, and coccygeal plexus located in the coccygeal region.
The Cervical Plexus
The cervical plexus, formed by the anterior rami of the first four...
The Cervical Plexus
The cervical plexus, formed by the anterior rami of the first four...
3.5K
01:05Accessory Structures of the Skin: Nails
4.2K
Nails are one of the important accessory structures of the skin. They are hard, protective structures that cover the dorsal surface of the distal phalanges of fingers and toes. Nails are composed of specialized keratinized cells and serve various functions, including protection, sensation, and manual dexterity.
The main components of a nail include the following.
Nail Plate: The nail plate is the visible portion of the nail that extends beyond the fingertips or toes. It is a hard, translucent...
The main components of a nail include the following.
Nail Plate: The nail plate is the visible portion of the nail that extends beyond the fingertips or toes. It is a hard, translucent...
4.2K
01:23Knee Joint
3.7K
The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris...
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris...
3.7K
01:16Muscles of the Forearm that Move the Hand and Fingers
3.0K
The muscles of the forearm that move the wrist, hand, and digits are numerous and diverse. They can be classified into two groups based on their location and function — the anterior and posterior compartment muscles.
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi...
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi...
3.0K