Ulnar Variance
– Discussion: – mean ulnar variance is 0.9 mm (range: 4.2 to 2.3 mm); – functional anatomy: – w/ neutral variance, 80% of load is born by radius and 20% by ulna; – 2.5 mm increase in ulnar varience will increase … Read more
Data Trace Editor
Ulnar Sided Wrist Pain
– Discussion: – osseous related pain: – hamate fracture – pisiform fracture – ulnar styloid frx – base of the fifth metacarpal – TFCC – radioulnar joint – … Read more
Ulnar Styloid Process Frx
– Anatomy: – Tunnel V: – overlies distal ends of radioulnar articulation on dorsum of wrist, contains EDM; – Tunnel VI: – in groove between the apex of ulnar styloid process & ulnar head, contains ECU tendon which is palpable from … Read more
Ulnar Nerve in Elbow Trauma
– See: – Ulnar Nerve: – Cubital Tunnel Syndrome: – Discussion: – ulnar nerve neuritis is a reported of operative treatment for elbow frxs; – one of complications of ORIF of elbow frxs is adherence of the ulnar nerve directly to medial epicondylar region w/ … Read more
Ulnar Bursae
– Anatomy: – ulnar bursae includes little finger tendon sheath which begins at terminal phalanx & extends proximally half way up the palm; – occassionally the distal unexpanded part of little finger tendon sheath does not communicate w/ ulnar bursae; – in the palm, the ulnar … Read more
Ulnar drift: of MP joints
– See: – MP joint deformities – Distal Ulna Arthroplasty – Rheumatoid Hand – Anatomical Contributing Factors: (to ulnar drift) – normal mechanical advantage of the ulnar intrinsic muscles – asymmetry & ulnar slope of MC heads of index & middle fingers; – asymmetry of the collateral … Read more
Ulnar Nerve Blocks
– Discussion: – ulnar nerve blocks are used for frxs of little finger ray & in along w/ median and radial sensory blocks for ring finger ray fractures; – Anatomy: – ulnar nerve has two sensory branches that provide sensory innervation to ulnar side of the hand; – palmar … Read more
Fractures of the Unla:
– night stick fracture: mechanism: direct trauma w/ forearm used to block blow – stable frx: – diplaced < 50% = Stable; – periosteum & interosseous membrane are intact & act as restraint to rotation; – unstable fracture: … Read more
Ulnar Artery: Hypothenar Hand Syndrome
– See: – Vascular Problems of the Wrist and Hand: – Discussion: – traumatic thrombosis of superficial palmar arch of ulnar artery resulting from repetitive use of hand as hammer; – in this maneuver, maximum force of the blow occurs over hook hamate bone, stie of … Read more
Ulnar lengthening
– Discussion: – indications are essentially the same as for radial shortening; – advocates of ulnar lengthening for Kienbock’s dz base their theorem on the fact that an ulnar lengthening procedure decreases the load across the radiolunate joint; – this procedure is ideally suited for pts … Read more