|Year : 2018 | Volume
| Issue : 1 | Page : 44-48
Surgical fixation of Rookwood Type III–V acromioclavicular joint dislocation with acromioclavicular: Hook plate
K Lingaraju, Idris Kamran, HP Shobha, Syed Wahaj
Department of Orthopaedics, Mysore Medical College and Research Institute, Mysore, Karnataka, India
|Date of Web Publication||17-Aug-2018|
Dr. Idris Kamran
Room No. 115, Mysore Medical College and Research Institute, PG Hostel for Men, Irwin Road, Mysore - 570 001, Karnataka
Source of Support: None, Conflict of Interest: None
Context: Acromioclavicular (AC) joint dislocation is one of the common shoulder problems accounting for 9% of all shoulder injuries and occurs five times more frequently in men than in women. Aims: In the present study, we aim to assess the functional outcome of hook plate fixation for the treatment of acute Rockwood Type III–V AC joint dislocation and to know the complications associated with the implant. Settings and Design: This was a prospective study. Subjects and Methods: Twenty patients, both male and female, with a mean age of 42 years who had acute dislocation of the AC joint were included for the study. Nine patients had Type III, four patients had Type IV, and 7 patients had Type V dislocation according to Rockwood classification. Patients were followed up till 6 months and were evaluated using Constant–Murley score. Statistical Analysis used: For the statistical analysis, descriptive statistics were calculated with the objective of summarizing the set of data analyzed. Results: The mean Constant–Murley score was 82.5 at 6-month follow-up. Four patients had complications of which one had superficial infection, two had subacromial erosion, and one had osteoarthritis of AC joint. Conclusions: Radiographic outcome based on the maintenance of reduction indicates that hook plate fixation is a better treatment option and is an effective method for the treatment of AC joint dislocation. Osteoarthritis and osteolysis are two common complications, which are associated with impairment of shoulder function. Shoulder function will be improved after the removal of hook plate.
Keywords: Acromioclavicular hook plate, acromioclavicular joint dislocation, Constant–Murley score, Rockwood Type III–V
|How to cite this article:|
Lingaraju K, Kamran I, Shobha H P, Wahaj S. Surgical fixation of Rookwood Type III–V acromioclavicular joint dislocation with acromioclavicular: Hook plate. J Orthop Traumatol Rehabil 2018;10:44-8
|How to cite this URL:|
Lingaraju K, Kamran I, Shobha H P, Wahaj S. Surgical fixation of Rookwood Type III–V acromioclavicular joint dislocation with acromioclavicular: Hook plate. J Orthop Traumatol Rehabil [serial online] 2018 [cited 2021 Jul 24];10:44-8. Available from: https://www.jotr.in/text.asp?2018/10/1/44/239261
| Introduction|| |
Acromioclavicular (AC) joint dislocation is one of the common shoulder problems accounting for 9% of all shoulder injuries. It can result from both direct and indirect trauma. Direct trauma is caused by superiorly directed impact on the lateral part of the shoulder with arm in adducted position forcing the arm in an inferior direction., Indirect trauma generally results from fall on an adducted and outstretched arm causing the humeral head to be driven into the inferior aspect of the acromion and the joint itself.
On the basis of magnitude and direction of dislocation, Rockwood et al. introduced a classification system to classify AC joint dislocations from Grade I to VI. It is generally accepted that Types I and II can be managed conservatively, conservative or operative is still controversial for Type III injuries, and Types IV–VI injuries are treated operatively. Various surgical options have been developed including fixation across the AC joint by tension band wiring or fixing using K-wires and extra-articular Bosworth screws to maintain reduction. However, both of these techniques lead to a nondynamic fixation, which can lead to loosening or breakage of the implant,, and then came other surgical modalities such as coracoacromial ligament transfer (Weaver–Dunn procedure), coracoclavicular (CC) fixation, and AC or CC reconstruction. However, the clinical superiority of these procedures remains debatable, and various complications have been reported.,
Later, AC hook plates were developed as an alternative method of fixation for dislocations of AC joint in which the hook of the plate is inserted under the acromion process and plate fixed to the lateral clavicle. The plate by maintaining reduction of the joint promoted natural healing of the ligaments. However, concerns were raised about subacromial impingement, subacromial erosion, osteoarthritis of AC joint, and even rotator cuff injuries for which early removal of plate was advocated.
In the present study, we aim to assess functional outcome of hook plate fixation for the treatment of acute Rockwood Type III–V AC joint dislocation without CC ligament reconstruction and to know the complications associated with the implant.
| Subjects and Methods|| |
Twenty patients, both male and female, who had acute dislocation of the AC joint and with AC hook plate fixation were included in the study. All patients had closed fractures. Patients with open injuries and severe soft-tissue compromise were excluded from the study. Sixteen were male patients and four were female patients. The mean age of patients was 42 years (age range from 20 to 50 years). Right AC joint was injured in 12 patients and left in eight patients.
Road traffic accidents (n = 13) were major form of injury where patients had direct trauma to their shoulder. Five patients had self-fall on their shoulder. Two had sports injuries [Figure 1]. Patients were evaluated using anteroposterior radiograph for both shoulders and classified according to Rockwood classification [Figure 2]. Nine patients had Rockwood Type III [Figure 3], four patients had Type IV, and seven patients had Type V dislocation [Figure 4].
|Figure 1: Bar diagram showing distribution of Mech of injury in males and females in the study|
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|Figure 2: Graphical representation of Rockwood AC joint dislocation types in the study|
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Surgical technique-Patient put in beach-chair position. Tranverse incision made over lateral end of clavicle and acromion. After cutting the deltotrapezial fascia, the joint was reduced by direct visualization and appropriately sized hook plate was applied with the hook positioned posteroinferior to the acromion. Finally, the plate was then fixed to the clavicle using screws. No supplemental repair or reconstruction of CC/AC ligaments was done. Wound closed and arm sling were used for 14 days postoperatively.
Passive-assisted range of motion started from postoperative day 3 as per pain tolerance. Progressive rehabilitation was initiated after 2 weeks. All patients were allowed to use their arm for daily activities, and nonrestricted movement was allowed at 6 weeks postoperatively [Figure 5]. Lifting weights were allowed from 3 months postoperatively. Patients were followed up till 6 months [Figure 6] and [Figure 7] and at final follow-up were evaluated using Constant–Murley score [Figure 8], [Figure 9], [Figure 10].
After evaluating the score, hook plate removal was considered at 6 months postoperatively. Constant murley score has 4 compoents: Pain, activity level, range of motion, strength. Pain (maximum score: 15 points); activity level (maximum score: 20 points); range of motion (maximum score: 40 points); strength (maximum score: 25 points), total score of 100 points. The better the function, the higher the score (Source for Constant–Murley score table: http://www.eoj.eg.net).
| Results|| |
Patients were followed up at 1, 3, and 6 months postoperatively. Radiological assessment was done at each follow-up by taking anteroposterior X-ray for both shoulders to check for subacromial erosion, osteolysis of lateral clavicle, osteoarthritis of the AC joint, and loss of reduction, which were assessed by measuring the distance between coracoid process and the clavicle and compared these with the contralateral side. At final follow-up at 6 months, two patients had subacromial erosion [Figure 11] and one had osteoarthritis of AC joint.
Patients were analyzed for functional outcome at 6-month follow-up. The mean Constant–Murley score was 82.5 at final follow-up which has a maximum score of 100 points. Four patients had complications of which one had superficial infection which was treated by intravenous antibiotics and regular dressing for 3 days followed by oral antibiotics for 1 week. No deep infection or neurovascular deficits were seen. Two patients had subacromial erosion and one had osteoarthritis of AC joint where patients complained of pain on shoulder abduction beyond 90° [Figure 12]. This subsided once hook plate was removed at 6 months after the surgery. None of the patients had loss of reduction, fracture of acromion or lateral clavicle, or implant failure.
| Discussion|| |
Conventionally, K-wires or tension band wiring and extra-articular Bosworth screw were used to maintain reduction. However, these techniques lead to loosening and breakage of the implant. Other surgical modalities such as coracoacromial ligament transfer (Weaver–Dunn procedure), CC fixation, and AC or CC reconstruction are also used. However, the clinical superiority of these procedures remains debatable, and various complications have been reported with these techniques. On the other hand, AC hook plate has become widely used as it enables secure fixation against horizontal, rotational, and vertical forces as well as allows early joint motion. The plate by maintaining reduction of the joint promotes natural healing of the ligaments and avoids direct injury to the joint because it is not fixed by pins or screws into the AC joint., Previous studies have reported satisfactory clinical results of hook plate fixation for AC joint dislocation.
In our study, mean Constant–Murley score was 82.5 at 6-month follow-up and was comparable with similar study by Yoon et al. which had Constant–Murley score of 90.2. Patients returned to their activities as early as 2 weeks and were comparable with results of similar earlier studies. Lin et al. demonstrated that AC hook plate could cause subacromial shoulder impingement and rotator cuff lesion, and they advocated the removal of the implant as soon as ligamentous healing is achieved that is by 6 months.
In our study, two patients had subacromial erosion and one had osteoarthritis of AC joint causing pain on overhead abduction which subsided with removal of implant. There were no loss of reduction and therefore no need for any secondary surgery for reduction apart from surgery for removal of implant. The CC distance was maintained after the removal of hook plate. Based on radiographic maintenance of reduction, hook plate fixation is considered superior, despite the higher incidence of acromial erosion, osteoarthritis associated with this technique which can be avoided by timely removal of the implant., The limitation of our study is a relatively small sample size (20 patients) and absence of control group.
| Conclusions|| |
Radiographic outcome based on the maintenance of reduction indicates that hook plate fixation is a better treatment option and is an effective method for the treatment of AC joint dislocations. Osteoarthritis, subacromial osteolysis, and subacromial shoulder impingement are the common complications which are associated with hook plate, resulting in pain and impairment of shoulder function. Shoulder function will be improved after removal of the hook plate.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7], [Figure 8], [Figure 9], [Figure 10], [Figure 11], [Figure 12]