Table of Contents
What is MCP joint capsule?
The joint capsule surrounds the MCP joint blending with the palmar plate and the collateral ligaments. It functions to stabilize the joint dorsally and is taut in joint flexion. This structure allows the extensor muscle to extend the MCP joint despite minimal attachment to the proximal phalanx.
What type of joint is the thumb MCP?
condyloid type synovial joints
Metacarpophalangeal (MCP) joints are condyloid type synovial joints between the metacarpal bones and proximal phalanges of the hands.
What is a thumb capsule?
The joint capsule of the thumb MP joint is a stout structure that attaches circumferentially around the joint and seals the joint. The joint capsule blends with the palmar plate and the collateral ligaments.
Does the thumb have an MCP joint?
The metacarpophalangeal (MCP) joint of the thumb is primarily stabilized by the radial and ulnar collateral ligaments, which provide radioulnar and dorsal stability.
What is the first MCP 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. When arthritis affects the MP joint, the condition is called MP joint arthritis.
What MCP joint position is most prone to injury?
Finger metacarpophalangeal joint dislocation (MCP) joint The border digits (index and small) are more susceptible to injury, particularly in extension when either finger is less protected by neighboring digits and the collateral ligaments are lax.
What type of joint is only found in the thumb?
Interphalangeal Joint (IP) The thumb digit has only two phalanges (bones) so it only has one joint. The thumb interphalangeal (IP) joint is similar to the distal interphalangeal (DIP) joint in the fingers.
Which type of joint is thumb?
saddle
The first carpo-metacarpal joint is (most commonly known as Thumb joint) a saddle type of joint. The metacarpo-phalangeal joint is condyloid type of joint.
Does the thumb have a PIP joint?
There are two sets in each finger (except in the thumb, which has only one joint): “proximal interphalangeal joints” (PIJ or PIP), those between the first (also called proximal) and second (intermediate) phalanges.
What do joint capsules do?
The joint capsule resembles a sac-like envelope that forms a sleeve around the synovial joint and encloses its cavity. It seals the joint space, provides passive stability by limiting movements, provides active stability via its proprioceptive nerve endings, and may form articular surfaces for the joint.
Where does the MCP joint meet the hand?
The metacarpophalangeal joint (MCP joint), or knuckle, is where the finger bones meet the hand bones. At the MCP joint, the fingers can move in multiple directions. They can bend, straighten, spread apart and move together.
How are the fingers affected by MCP joint arthritis?
At the MCP joint, the fingers can move in multiple directions. They can bend, straighten, spread apart and move together. MCP joints are important for both pinching and gripping. MCP joint arthritis is most common in the thumb and index fingers due to the stress of pinching.
What does MCP stand for in medical terms?
MCP joint arthritis is most common in the thumb and index fingers due to the stress of pinching. The different joints of the hand are shown in Figure 1. Arthritis means joint inflammation and is a word that is often used to describe pain or a problem at a joint.
What are the options for joint replacement with MCP?
There are many surgical options depending on the type and severity of arthritis. If the arthritis is extensive and severe, joint replacement or joint fusion are effective surgical options. Learn more about joint replacement.