Related Experiment Video
Updated: Feb 5, 2026
In Vivo Electrophysiological Measurement of the Rat Ulnar Nerve with Axonal Excitability Testing
Published on: February 6, 2018
Step-Cut Ulnar Shortening Osteotomy for Ulnar Impaction Syndrome
Loukia K Papatheodorou1, Dean G Sotereanos1,2
1Orthopaedic Specialists-UPMC, University of Pittsburgh, Pittsburgh, Pennsylvania.
Introduction:
The step-cut ulnar shortening osteotomy for the treatment of ulnar impaction syndrome is a safe, reliable, and less expensive technique that uses a 7-hole 3.5-mm standard neutralization plate and a lag screw for fixation, thus avoiding the need for the special instrumentation that other ulnar shortening techniques require.
Step 1 Preoperative Planning:
Perform a physical examination and obtain imaging studies to identify all associated abnormalities.
Step 2 Wrist Arthroscopy Video 1:
Verify the diagnosis of ulnar impaction syndrome and treat concurrent intra-articular abnormalities.
Step 3 Incision For The Ulnar Shortening Osteotomy Video 2:
Make a longitudinal skin incision along the distal third of the ulna.
Step 4 Design The Step-Cut Ulnar Shortening Osteotomy Video 2:
Design the step-cut ulnar shortening osteotomy.
Step 5 Perform The Step-Cut Ulnar Shortening Osteotomy Video 2:
Create the step-cut ulnar shortening osteotomy using an oscillating saw.
Step 6 Fixation Of The Osteotomy Video 3:
Fix the osteotomy with a lag screw and volar plate.
Step 7 Wound Closure:
Meticulously close the wound in layers.
Step 8 Postoperative Care:
Protect the affected arm for the first 6 weeks.
Results:
In our original study, 164 patients with symptomatic ulnar impaction syndrome were treated with a step-cut ulnar shortening osteotomy using a volar 3.5-mm standard neutralization plate and a lag screw14.
Related Concept Videos
01:19Impact of Groups on Groups
01:17Cut-off Frequency of BJT
Alpha Cut-Off Frequency: Pertinent to the common-base configuration, the alpha cut-off frequency defines the upper-frequency limit at which the current gain, alpha, remains stable. As...
01:08Brick Cutting Techniques
Cut bricks are categorized by size. Bricks cut to half their original length are called half-bats, while those cut to three-fourths their length are known as three-fourth bats.
Special types of...
01:30Impact
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
03:08Rate-Determining Steps
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
01:28Impact of Groups on Individuals