Niall Kirkpatrick

Buckling and hydraulic mechanisms in orbital blowout fractures: fact or fiction?

Since the first description of orbital blowout fractures, there has been much confusion as to their etiology. Two principal mechanisms have been proposed to explain their production, the buckling and the hydraulic mechanisms caused, respectively, by trauma to the orbital rim and the globe of the eye. The aim of this study was to evaluate both mechanisms qualitatively and quantitatively. Our protocol used intact cadavers, quantifiable intraocular pressure, variable and quantifiable force, and quantifiable bone strain distribution with strain gauge analysis. One orbit of each cadaver was used to simulate each of the two mechanisms, allowing direct comparison. Fractures produced by the buckling mechanism were limited to the anterior part of the orbital floor, with strain readings reaching up to 3756 &mgr;&egr;. Posteriorly, strain did not exceed 221 &mgr;&egr;. In contrast, hydraulic-type fractures were much larger, involving anterior and posterior parts of the floor as well as the medial wall of the orbit. Here, strain exceeded 3756 &mgr;&egr; in both parts of the floor. Furthermore, we have demonstrated that the average energy required to fracture the orbital floor by the buckling mechanism is 1.54 J, whereas an average energy of 1.22 J is needed to produce this fracture by the hydraulic mechanism. Our results suggest that efforts to establish one or another mechanism as the primary etiology are misplaced. Both mechanisms produce orbital blowout fractures, with different and specific characteristics. We believe this provides the basis for our reclassification of such fractures.

Endoscopic removal of periorbital lesions

In this article, the authors describe the technique, indications and contra-indications for removing various periorbital lesions with an endoscope. The principal reason for using this technique is the excellent postoperative cosmesis. Seven patients in total had lesions removed in this manner. The only complication noted was some leakage of the contents of a dermoid cyst intraoperatively. Cosmesis postoperatively was excellent in all cases. None of the cases had to be converted to an ‘open’ procedure.

Re-thinking 3D printing: A novel approach to guided facial contouring

Rapid prototyped or three dimensional printed (3D printed) patient specific guides are of great use in many craniofacial and maxillofacial procedures and are extensively described in the literature. These guides are relatively easy to produce and cost effective. However existing designs are limited in that they are unable to be used in procedures requiring the 3D contouring of patient tissues. This paper presents a novel design and approach for the use of three dimensional printing in the production of a patient specific guide capable of fully guiding intraoperative 3D tissue contouring based on a pre-operative plan. We present a case where the technique was used on a patient suffering from an extensive osseous tumour as a result of fibrous dysplasia with encouraging results.

A novel approach for successful closure of sinonasal fistulae

UNLABELLED Medial canthus sinonasal fistula is associated with troublesome aesthetic and functional issues. Corneal irritation and drying results from escape of both air and secretions from the nasal cavity across the ocular surface as well as misting of spectacles if worn. Reconstruction of such fistulae is associated with a high rate of recurrence and thus presents a difficult surgical challenge. METHODS This paper describes the senior authors surgical approach to manage medial canthus sinonasal fistulae utilizing an interpolated forehead flap combined with extended galeafrontalis and pericranial flap for stepped closure. The technique of flap elevation and inset is discussed, with emphasis on key manoeuvres to prevent sinus recurrence. A retrospective review of consecutive cases is presented. RESULTS Four patients were treated using this technique over 12 months. In all cases, fistulae developed following adjuvant radiotherapy for tumour resection. Flap elevation was performed in combination with a bicoronal approach in 2 patients and via direct forehead approach in 2 patients. No post-operative complications or recurrence of fistula have occurred over 12 months follow-up. CONCLUSION The success of this technique is attributed to inclusion of a galeafrontalis and pericranial extension to the forehead flap. In addition, the fistula site must be prepared to accommodate the flap by dissection of a wide subcutaneous pocket. This stepped method of closure provides an effective barrier to air and nasal secretions and also achieves an excellent aesthetic outcome.

Facing The World in Vietnam: Feedback From Trainees on the Educational Value of Surgical Missions to Help Patients With Craniofacial Deformities.

Background:Education and training of local healthcare staff is a crucial component of a surgical mission. Facing The World (FTW) is a UK-based craniofacial charity that provides facial reconstructive surgery to children with complex, craniofacial anomalies. As part of its global initiative, FTW has developed a training outreach program in Vietnam. The aim of this study was to analyze feedback data to evaluate the educational value of the training program and identify areas for improvement. Methods:Feedback was obtained through both 5-point Likert scale and open-ended response questions on written questionnaires. Six postmission reports were reviewed, and used as a base for the content of the questionnaires. Selective sampling was used, with questionnaires distributed to all Vietnamese and UK trainees who have been part of the FTW training program. Results:Seven Vietnamese trainee questionnaires were completed, a response rate of 87.5%. Twelve UK trainees completed the feedback questionnaire, giving a response rate of 85.7%. One hundred percent of local trainees and 83.3% of UK trainees found the training program to be useful or very useful, with no trainees deeming the training program not useful or of no use at all. Conclusion:The training missions offered by FTW have successfully provided education to both UK and Vietnamese surgeons in Craniofacial surgical techniques and patient care. No negative responses were identified in both questionnaires. The feedback provides evidence of FTWs effective training program, while allowing insight into where further improvements can be made.

Facing the World: the evolution of a craniofacial charity.

Facing the World (FTW) was founded by Martin Kelly and Norman Waterhouse following the challenges they had experienced while treating children with severe facial disfigurement on humanitarian missions in the developing world. WhenMartin Kelly visited Afghanistan with ‘‘Save the Children,’’ he met a young patient with a facial cleft, who was living under threat of infanticide as a result of her disfigurement. Despite having the knowledge and skill, he was unable to treat her with the limited facilities available in Afghanistan. The mission just did not have the capability to provide complex craniofacial treatment. The only option left was to take her back to the United Kingdom for treatment at the Chelsea & Westminster Hospital. To be able to treat complex craniofacial conditions as part of a humanitarian mission, there are 2 choices; either to bring patients back to the United Kingdom for treatment or to create the facility to provide craniofacial surgery in the host country. As a result, FTWwas created in 2002 with the aim, ‘‘to offer life changing facial reconstructive surgery to children with the severe facial disfigurement who are unable to receive the treatment that they need to become a whole person, so that they can face their lives with at least some of the success that we take for granted.’’

Use of the orbicularis retaining ligament in lower eyelid reconstruction

INTRODUCTION The orbicularis retaining ligament (ORL) is a distinct anatomical structure that has only been recently characterised. A variety of techniques, based on Hamras concepts, now divide this ligament during lower lid blepharoplasty. This often produces a substantial skin excess which is discarded. We set out to investigate the validity of this surgical manoeuvre as a means of recruiting anterior lamella for the purposes of lower lid reconstruction. MATERIALS AND METHODS Between September 2002 and August 2004, 23 patients underwent reconstruction of the anterior lamella of their lower eyelid using this technique. The mean age of the patients was 56 years (range 26-86 years). The mean follow-up time was 20 months (range 12-36 months). Clinical evaluation was carried out preoperatively and postoperatively to assess the presence of palpebral non occlusion, epiphora, the sensation of a dry eye, ectropion, conjunctivitis and keratitis. Assessment of the tissue deficit was made clinically and with standardised digital photographs. RESULTS Satisfactory reconstruction of the anterior lamella of the lower eyelid was achieved in 19/23 patients. Preoperative symptoms of epiphora and lower lid position were improved. The visual analogue scale of appearance was improved postoperatively. In some cases, particularly in the atrophic lower lid, the results were short lived and further surgery was required to achieve optimal results. CONCLUSION In cases of isolated cutaneous deficit where the lid support mechanisms are intact, the procedure is both successful and aesthetically favourable for resurfacing this challenging area.