the elbow complex (test 2) Flashcards
what joints makes up the elbow complex
elbow joint: humeroulnar and humeroradial joints
Proximal radioulnar joint (PRUJ) and distal radioulnar joint (DRUJ)
the elbow joint is a ____ joint with ___ DOF
hinge
1 (flex/ext)
what plane does the elbow joint move in and around what axis
sagitall and coronal
the proximal radioulnar joint and distal radioulnar joint what type of joint and how many DOF
diarthrodial pviot joint and 1 DOF (sup/pro)
what is medially located on the humeroulnar articulation
trochlea
the trochelar groove divides into ___ and ___ portions
medial and lateral
what receives the coronoid process of ulnar at the end of elbow FLX
coronoid fossa
what is the proximal humeroradial articulation
capitulum
what does the capitulotrochlear groove separate
the capitulum from the trochlea
what receives the head of the radius in full elbow flex
radial fossa
what receives the olecranon process of ulna in full elbow extension
olecranon fossa
the trochlear , coronoid fossa, capitulum , radial fossa and olecranon fossa are apart of what joint structure
proximal joint structure of the elbow joint
the distal joint surface of the elbow joint is made up of what
radius and ulna
what part of the distal joint surface of the elbow has a concave surface called the trochlear notch with trochlear ridge
ulna
what process is at the proximal end of the trochlear notch of the ulna ? distal end?
olecranon process
coronoid process
what notch is lateral to the coronoid process of the ulna and what does it articulate with
radial notch and articulates with the radial head
what part of the distal joint surface of the elbow has a cup shaped concave surface called fovea
radius
the radius is surrounded by a ___ rim that fits into the ____ grooove
convex
Capitulotrochlear
in the humeroulnar joint what slides on what
trochlear notch slides on trochlea
in full flexion of the elbow joint at the humeroulnar joint , what process enter the coronoid fossa ?
coronoid process
during full extension of the elbow joint at the humeroulnar joint the olecranon process enters what
the olecranon fossa
at the humeroradial joint of the elbow what slides over what
the concave radial head slides over the convex capitulum
in full flexion of the elbow joint at the humeroradial joint , the rim of the radial head slides into what
radial fossa
in full flexion of the elbow joint at the humeroradial joint , what happens between the head and the capitulum
there is no contact
what kind of joint capsule is the elbow
large , loose and weak
the joint capsule of the elbow is continuous with and reiinforced by what
collateral ligaments
what lines the coronoid , radial and olecranon fossa of the elbow
synovial layer
what type of fold is there between the proximal radius and ulna
triangular synoival fold
hypertrophy of triangular synovial fold between the proximal radius and ulna can causes what
lateral epicondylalgia ,inflammation or degenerative changes
the triangular synovial fold can be aggravated by what kind of activities
repetitive such as reptitive gripping , wrist extension , pushups
hypertrophy of triangular synovial fold between the proximal radius and ulna can be improved how
distraction of humeroradial joint
the triangular synovial fold between the proximal radius and ulna is located on which side of the elbow
lateral
how many bundles for the MCL/ UCL have
3 ( ant, post , transverse )
the anterior bundle of the MCL is primary restraining to what
valgus stress ( arm going out )
20-120° of elbow flex
what bundle of the MCL limits elbow ext and less restraint to valgus stability
posterior
what bundle of the MCL may help keep joint surfaces in approximation
transverse
what does the LCL complex do
reinforces humeroradial articulation
the LCL provides some protection against what kind of stress
varus
what ligaments are secondary restraint to combined forced varus and supination forces
Lateral ulnar collateral lig and annular lig
what are the primary flexors of the elbow joint
brachialis
biceps brachii
brachiorad