- Case report
- Open Access
Balloon-guided inflation osteoplasty in the treatment of Hill-Sachs lesions of the humeral head: case report of a new technique
© Sandmann et al. 2016
Received: 22 August 2015
Accepted: 17 January 2016
Published: 1 February 2016
The use of the extra-vertebral balloon osteoplasty is increasing and in the meanwhile it has become a safe surgical technique in the treatment of tibial head, distal radius and calcaneus fractures. In addition, we already could show in a biomechanical setup that the balloon osteoplasty might be a safe tool for reduction in the treatment of Hill-Sachs lesions, but clinical application has not been performed so far.
We report the case of a 53 year- old male patient who was referred to our Trauma department (level I trauma center) after the first manifestation of a posterior shoulder dislocation due to an epileptic seizure, originated in a- up to this date unknown -glioblastoma. After closed reduction of the dislocated shoulder the X-ray showed a subcapital fracture of the proximal humerus with a large reversed Hill-Sachs lesion. We performed an open surgery via a deltoideopectoral approach and balloon osteoplasty was used to reduce the impression fracture (Hill-Sachs lesion) before fixing the fracture with a locking plate. In the post-operative CT scan we could show an anatomical reduction of the Hill-Sachs lesion. At the follow-up examination one year after surgery the patient reached full range of motion and stated no re-dislocation of the shoulder nor instability or pain.
The reduction of an impressed humeral head fracture by use of balloon osteoplasty is a safe technique. This technique could be a new option in the treatment of Hill-Sachs lesions and might be an alternative to well known standard procedures like the remplissage or tendon transfers without affecting rotation.
The use of the balloon-guided kyphoplasty is a safe and reliable operative technique  and in the meantime several extra-vertebral applications have been described. In this meaning reports about the balloon osteoplasty reduction concerning tibial head, the distal radius and calcaneal fractures [2–5] can be found. In addition we already could show in an experimental setup that the balloon- osteoplasty might be an alternative in the treatment of reverse Hill-Sachs lesions . This entity is caused by the impaction of the humeral head on the posterior glenoid rim and is often the result of seizures  and often bilateral  and is associated with recurrent instability in up to 30 % . In fact - apart from the inverted pear-shape glenoid- the engaging Hill-Sachs lesion is reported to be one of the reasons for failed shoulder stabilizations . However, the treatment of reverse Hill-Sachs lesions is vague and diverse treatment options exist ranging from percutaneous correction , osteochondral allograft transplantations , rotational osteotomies  to remplissage maneuvres as proposed by Park et al.  or tendon transferring gap closing procedures as proposed by Hawkins  and McLaughlin . For those lesions comprising more than 40 % of the humeral head arthroplasty is regarded as the best possible treatment option . Most of the known techniques are demanding and result in a limitation of range of motion. This case report describes – to our knowledge- the first safe clinical application of the balloon osteoplasty for the reduction of a reverse Hill-Sachs lesion in a patient with posterior shoulder dislocation.
The patient recovered well from this surgical intervention, achieved a free range of motion and had no re-dislocation at the one year follow-up. No technique-related complications occured. Unfortunately, we are not able to report about the long-term follow-up as the patient died of complications caused by his glioblastoma 22 months after surgical intervention.
Posterior dislocation of the shoulder is a rare entity and therefore often misdiagnosed . Once diagnosed, the therapy depends on the amount of the defect and the time from injury. Especially the size of the defect plays a crucial/ way guiding role in the further therapy. Defects up to 25 % and dislocations less than 3 weeks might be treated conservatively by closed reduction and immobilization in external rotation  whereas defects larger than 50 % of the articular surface should be treated with shoulder arthroplasty [17, 21]. The management of defects ranging from 25 to 50 % is still controversial and more challenging and debates on the best treatment options are ongoing. Mc Laughlin was the first surgeon who recognized the importance of impaction fractures in posterior shoulder dislocations. He recommended a subscapularis tendon transfer into the defect to avoid the engaging of the reverse Hill-Sachs lesion on the cost of compromised rotation. This technique was modified by Hawkins  recommending a transfer of the lesser tubercle and by Charalambous et al.  proposing a plication of the subscapularis tendon into the humeral head defect using suture anchors. All described techniques alter the humeral head anatomy, and compromise secondary prosthetic reconstruction and might lead to a limited internal rotation . Therefore, several authors proposed more anatomic reconstructions using cancellous bone as autografts/ allografts for defect- filling of the impression fracture [12, 24, 25].
As an alternative technique Keppler et al.  described the treatment of locked posterior dislocations using a humeral rotational osteotomy. However, this method has not gained popularity due to technical difficulties and the risk of devascularisation of the humeral head. Hence, we were looking for a new technique of Hill- Sachs reconstruction with limited surgical trauma and immediate postoperative physiotherapy and no loss of internal rotation.
The presented case describes the reduction of the reverse Hill-Sachs lesion using a regular kyphoplasty balloon  in a first clinical application. We could achieve an anatomic reduction of the reverse Hill-Sachs lesion and the patient recovered without any complications as wound infection, failure of the osteosynthesis or re-dislocation. At follow-up 1 year after surgery, he had regained full range of motion and no shoulder-related problems during activities of daily living. Unfortunately, we are not able to report about the long-term result as the patient died of complications due to his glioblastoma 22 months after surgical intervention. However, especially in this situation it was important that the patient has a long time of remaining life quality with a limited surgical trauma. Hence we applied this new technology, since it combines good reduction with a very limited surgical trauma and allows the patient immediate movement and physiotherapy.
Some questions are left unanswered and remain for future research. Though we used a open deltoideo-pectoral approach due to the accompanying subcapital fracture and the need of additional plating we are convinced that this technique is suitable under arthroscopic conditions thereby further reducing the surgical trauma and remaining minimal-invasive. From our own experience the Hill-Sachs lesions has then to be treated as close to the accident as possible. To enable exact arthroscopic intervention a guiding instrument as we know it from ACL reconstruction might be helpful as well as a fenestrated cannula likewise we used in tibial head reconstruction as an abutment and lesion indicator . In addition, the arthroscopic approach would be useful to address accompanying intra-articular comorbidities as labral lesions, pathologies of the biceps tendon or rotator cuff tears.
The other remaining point is the matter of defect filling after reduction of the reverse Hill-Sachs lesion. In our case we were able to save the reduction by positioning of the locking plate. In those cases where you would have an isolated impaction fracture it might be sufficient to limit range of motion to leave the defect unaffected for the first 6 weeks. As an alternative, defect filling would be possible either with cancellous bone or bone substitues and would probably be superior to filling of the emerging hollow with bone cement as described by Jacquot et al.  in the treatment of calcaneal fractures thinking of the generally younger age of our patients. In addition, the humeral head is a non-weight bearing bone and does not need the primary stability as desired in the treatment of calcaneal fractures.
Despite all positive reports on the inflation osteoplasty, this new surgical technique is not free from complications and as in all emerging techniques there is always the risk of potentially harm patients until the technique is well established and validated . In this context, Mauffrey et al.  reported on a complication rate related to this new surgical technique of 65 % in the treatment of tibial plateau fractures ranging from minor complications like balloon burst with leakage of the contrast dye or accidental extrusion of calcium phosphate to the posterior soft tissue to major complications consisting of intraarticular extrusion of calcium phosphate or the unability to elevate the depressed fragment by inflation osteoplasty.
However, this is a first report on the described technique in the reduction of a reversed Hill-Sachs lesion and further studies are needed with special remark on complications and their management.
In our described case the reduction of the reverse Hill-Sachs lesion by use of inflation osteoplasty enabled us to achieve an almost anatomical reduction in the humeral head without limitation of external rotation as commonly found in patients after remplissage or tendon transfers and there we see the great advantage of the presented technique. In cases with isolated reverse Hill-Sachs lesions the application of the balloon osteoplasty might be even performed arthroscopically and thereby further reducing the comorbidity of the open surgical approach.
Written informed consent has been obtained from the patient for the publication of this case report and any accompanying images.
A copy of the written consent is available for review for the editor-in-chief of this journal.
We acknowledge support by Deutsche Forschungsgemeinschaft and Open Aceess Publishing Fund of University of Tuebingen.
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