الفهرس 
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Abstract
SUMMARY
T
he Acromioclavicular Joint is one of four joints that comprises the Shoulder complex. The AC Joint serves as the main articulation that suspends the upper extremity from the trunk.
Injuries to the AC joint are common. They can present as sprains or dislocations. However, sprains are more common. The most common etiology is direct trauma to the AC joint or lateral trauma providing an axial load on the joint space.
Palpation reveal tenderness over the AC joint while range of motion is typically limited due to discomfort. Provocative tests for AC joint pathology can be helpful to localize shoulder pain to the AC joint. Standard radiographs include true anterior-posterior and axillary views, these views are generally sufficient to confirm the diagnosis.
Several methods have been used for the treatment of AC dislocations including transarticular fixation by hook plate, K-wires pinning, tension banding, Tightrope method, PDS-sling and Weaver–Dunn procedure.
The clavicular hook plate is the most commonly used treatment for AC joint dislocation. Single use of coracoclavicular lag screw or K-wire fixation in the treatment for AC joint dislocation has been already reported.
A comparative study conducted between coracoclavicular screw fixation and hook plate in acromioclavicular joint dislocation in 20 patients presenting to Beni-Suef University Hospital in the period between January 2020 to June 2020.
The study include 5 women and 15 men. Mean age at the time of the intervention was 33.30 years (range 19 to 55) .there were 11 patients (55%) were right side and 9 patients (45%) were left side . the Type of fixation of 10 patients (50%) was Hook plate, of the other 10 patients (50%) was Coraco-clavicular screw, all patients had not Intraoperative Complications.
The Post-operative complications noted 4 patients (20%) had Limitation of movement, only 4 patients (20%) had Subluxation, 5 patients (25%) had Delayed Healing, 8 patients (40%) had Pain during movement, 11 patients (55%) had Hardware removal, 3 patients (15%) had infection. By Comparison between types of fixation as regards Post-operative complications there was no statistically significant difference between types of fixation with post-operative complications.
Constant - Murley score of 5 patients (25%) was excellent, of 5 patients (25%) was fair, of 7 patients (35%) was good and of 3 patients (15%) was poor. By Comparison between types of fixation as regards Constant - Murley score there was no statistically significant difference between types of fixation with Constant - Murley score.
We recommend a future study with a large sample size and long term follow up would provide a better evaluation for acromioclavicular joint dislocations treatment. Future prospective controlled studies would be needed to draw firm conclusions.
Fixation with a cancellous screw in the surgical treatment of acromioclavicular joint dislocations is an effective method in achieving satisfactory shoulder functions, with ease of use, lower complication rate, and lower rate of acromioclavicular joint arthritis. Clavicular hook plate is a good implant option to be considered for fixation of acromioclavicular dislocations However, this method may result in subacromial erosions.