Related Experiment Video
Updated: Jun 29, 2026
04:27
Anterior Capsular Reconstruction with Human Dermal Allograft for Irreparable Subscapularis Tears
Published on: May 9, 2025
162
Acromioclavicular Reconstruction Using the Lockdown Technique: A Case Series and Systematic Review.
Krisztian Kovacs1,2, Szilárd Váncsa2,3,4, Zsolt Abonyi-Tóth2,5
1Department of Orthopaedics, Semmelweis University, 1082 Budapest, Hungary.
Journal of Clinical Medicine
|June 26, 2025
Summary
The Lockdown procedure effectively improves shoulder function and reduces pain for acromioclavicular (AC) joint dislocations, especially in acute cases. However, careful patient selection is crucial due to a moderate complication rate.
Area of Science:
- Orthopedic Surgery
- Sports Medicine
- Biomaterials Science
Background:
- Acromioclavicular (AC) joint dislocations are common, particularly in young male athletes.
- Optimal surgical treatment for Rockwood type III AC joint injuries remains debated.
- The Lockdown procedure, a synthetic ligament technique, offers a potential solution for AC joint stabilization.
Purpose of the Study:
- To evaluate the efficacy, safety, and patient satisfaction of the Lockdown procedure for AC joint stabilization.
- To compare outcomes in acute versus chronic AC joint dislocations.
- To assess complication rates and identify factors influencing outcomes.
Main Methods:
- A multicenter prospective study involving 39 patients (2018-2023) across three Hungarian hospitals.
- Assessment of shoulder function, pain levels, and complications using validated scoring systems.
- A systematic review of nine studies (205 cases) to broaden the analysis of outcomes and complications.
Main Results:
- Significant improvements in functional scores (OSS, Constant, DASH, SST, ASES, Nottingham, Imitani) and pain reduction were observed.
- Acute AC joint dislocations showed greater improvement in OSS compared to chronic cases (14.96 points, p=0.0017).
- A 30.8% complication rate was noted, primarily minor infections, with 5.1% requiring revision due to implant failure.
Conclusions:
- The Lockdown procedure demonstrates significant benefits in enhancing shoulder function and alleviating pain, particularly for acute AC joint dislocations.
- The procedure is associated with a moderate complication rate, necessitating careful patient selection and diligent postoperative management.
- Further research may be needed to optimize patient selection criteria and minimize complication risks.
Related Concept Videos
01:26Constraints and Statical Determinacy
In structural engineering, the equilibrium of a system is not only determined by its equations of equilibrium but also with the help of constraints. Constraints refer to restrictions on the motion of a system. The proper combinations of constraints can minimize the total number of constraints needed to maintain a system in mechanical equilibrium. When this happens, the system is said to be statically determinate. For such systems, the unknown reaction supports can be estimated using equilibrium...
01:30Frames
Frames are essential components of various mechanical and structural systems used daily. These structures are known for their stability and ability to bear heavy loads. A frame is constructed using two-force and multi-force members, interconnected using pin joints. In contrast, trusses are made entirely of two-force members.
Frames are versatile and widely used in various applications such as structural supports for beams and columns, automobile chassis construction, and in the construction...
Frames are versatile and widely used in various applications such as structural supports for beams and columns, automobile chassis construction, and in the construction...
01:22Machines: Problem Solving I
A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...
01:30Machines: Problem Solving II
Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
01:14Stability of structures
In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
01:26Reclosers and Fuses
Automatic circuit reclosers enhance the protection of distribution circuits by interrupting and auto-reclosing an AC circuit according to a preset sequence. They effectively manage temporary faults on overhead distribution lines, often caused by tree limbs or wildlife, by briefly disrupting service to improve overall reliability. However, contact with reclosers or energized broken conductors on the ground can pose serious hazards.
A comprehensive protection scheme for radial distribution...
A comprehensive protection scheme for radial distribution...