Where is the watershed line distal radius?
In concordance to Orbay’s description of the watershed line, 1 this line is situated between 10 and 15 mm proximal to the joint line on the radial side and 2 mm proximal to the joint line on the ulnar side.
What is the radius of the wrist?
The radius is one of two forearm bones and is located on the thumb side. The part of the radius connected to the wrist joint is called the distal radius. When the radius breaks near the wrist, it is called a distal radius fracture.
What attaches to distal radius?
The attachment of the dorsal radiocarpal (DRC) ligament spans the ulnar aspect of the dorsal rim of the distal radius from the ulnar margin of the Lister tubercle to the sigmoid notch.
Do you need surgery if you break your radius?
Surgery is required as soon as possible (typically within 24 hours or less after injury) for most open fractures. The exposed soft tissue and bone is thoroughly cleaned (debrided) and antibiotics are given to prevent infection. Either external or internal fixation methods are often used to hold the bones in place.
What is the pronator quadratus?
Pronator Quadratus is a deep-seated, short, flat, and quadrilateral muscle with fibres running in a parallel direction. The pronator quadratus muscle is compacted in a small closed compartment, covered by the interosseous membrane dorsally and distally and by its own fascia volarly.
What is watershed line?
The watershed line is a useful surgical landmark for positioning a volar locking plate. Implants placed on or distal to it can impinge on flexor tendons and cause injury. However, the details of the anatomy of this line are unclear.
What is carpal tunneling?
Carpal tunnel syndrome is when the median nerve is compressed as it passes through the carpal tunnel. The carpal tunnel is an opening in your wrist that is formed by the carpal bones on the bottom of the wrist and the transverse carpal ligament across the top of the wrist.
What does a broken scaphoid feel like?
Symptoms. Scaphoid fractures usually cause pain and swelling in the anatomic snuffbox and on the thumb side of the wrist. The pain may be severe when you move your thumb or wrist, or when you try to pinch or grasp something. Unless your wrist is deformed, it might not be obvious that your scaphoid bone is broken.
What 3 fossa are at the distal end of the humerus?
The body is cylindrical in its upper portion, and more prismatic below. The lower extremity consists of 2 epicondyles, 2 processes (trochlea & capitulum), and 3 fossae (radial fossa, coronoid fossa, and olecranon fossa).
Which fossa on the humerus articulates with the head of the radius?
The projection that forms the lower border of the trochlear notch, the coronoid process, enters the coronoid fossa of the humerus when the elbow is flexed. On the outer side is the radial notch, which articulates with the head of the radius. The head of the bone is elsewhere roughened for muscle attachment.
Which is the most famous fracture of the radius?
The distal radius fracture (wrist fracture) in particular is the most common radius fracture. In fact, they occur more often than most other types of fractures.
What is Palmaris longus?
The palmaris longus (PL) is a narrow, fusiform muscle of the superficial anterior compartment of the forearm [1,2,3,4,5,6]. The muscle originates at the medial epicondyle of the humerus and the antebrachial fascia, with the muscle belly partially fused with the adjacent muscles [3, 4].
What is the orientation of the scaphoid fossa?
Proximally, the scaphoid articulates with the scaphoid fossa of the distal radius and the lunate. The orientation of the scaphoid fossa is 11 degrees volar and 21 degrees ulnar relative to the long axis of the radius, and therefore at ∼65 degrees to the long axis of the scaphoid in the frontal plane.
What is the scaphoid bone?
The scaphoid bone is the largest bone of the proximal row of wrist bones, its long axis being from above downward, lateralward, and forward. It is approximately the size and shape of a medium cashew .
How many facets does the scaphoid have?
The scaphoid has four articular facets covering 80% of its surface and forms an important link between the proximal and distal carpal rows ( Fig. 1.3 ). 8 , 9 The kinematics of the wrist are governed by the ligamentous attachments of the scaphoid and the shape of the bones with which it articulates.
What is the scaphoid fossa lunate fossa and sigmoid notch?
The scaphoid fossa, lunate fossa, and sigmoid notch are three concave articular surfaces. The scaphoid fossa and the lunate fossa are separated by a dorsal-volar ridge which defines the scaphoid and lunate facets.