What is the trapeziometacarpal joint?
The trapeziometacarpal joint is commonly referred to as an incongruous saddle joint. It makes possible the wide circumduction of the thumb, enabling activities such as grasping and pinching [2], that involves three arcs of motion: flexion–extension, abduction–adduc- tion, and pronation–supination.
What type of joint is trapeziometacarpal?
Trapeziometacarpal joint
| Type | Synovial saddle joint; multiaxial |
|---|---|
| Articular surfaces | Distal surface of trapezium, proximal surface of metacarpal bone 1 |
| Ligaments | Radial carpometacarpal ligament, anterior oblique ligament, posterior oblique ligament |
| Innervation | Anterior interosseous nerve, posterior interosseous nerve (C7, C8) |
What is metacarpophalangeal joint?
The metacarpophalangeal joint or MP joint, also known as the first knuckle, is the large joint in the hand where the finger bones meet the hand bones. The MCP joint acts as a hinge joint and is vital during gripping and pinching.
What is a saddle joint simple definition?
Saddle joints are a type of synovial joint that allow articulation by reciprocal reception. Both bones have concave-convex articular surfaces which interlock like two saddles opposed to one another.
What is basilar thumb arthritis?
Basal thumb arthritis is a type of osteoarthritis affecting the base of the thumb at the carpometacarpal joint. This joint consists of the articulation of a wrist bone called the trapezium with the first metacarpal bone, which forms the base of the thumb.
Where is the Ulnohumeral joint?
The elbow joint
The elbow joint is actually three separate joints surrounded by a watertight sac called a joint capsule. This capsule surrounds the elbow joint and contains lubricating fluid called synovial fluid. The three joints of the elbow include: Ulnohumeral joint is where movement between the ulna and humerus occurs.
What type of joint is Intermetacarpal joint?
This is a saddle-shaped joint between the first metacarpal bone and the trapezium (greater multangular bone); it enjoys great freedom of movement on account of the configuration of its articular surfaces.
What type of joints are metacarpophalangeal joints?
The metacarpophalangeal (MCP) joints are multiaxial condyloid joints capable of flexion, extension, and some lateral motion and circumduction. The cam-shape of the metacarpal heads leads to relaxation of the collateral ligaments in extension, permitting adduction and abduction of the finger.
What are metacarpophalangeal joints formed by?
The metacarpophalangeal joints (MCP) are situated between the metacarpal bones and the proximal phalanges of the fingers. These joints are of the condyloid kind, formed by the reception of the rounded heads of the metacarpal bones into shallow cavities on the proximal ends of the proximal phalanges.
What joint is a saddle joint?
synovial joint
A saddle joint (sellar joint, articulation by reciprocal reception) is a type of synovial joint in which the opposing surfaces are reciprocally concave and convex. It is found in the thumb, the thorax, the middle ear, and the heel.
How are saddle joints formed?
A saddle joint is a type of biaxial and movable joint that allows movements on two planes–flexion or extension and abduction or adduction. This joint is mainly formed between the bones, whose articulating surfaces have both concave and convex regions.
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