This observational study is to document the application of a human bone graft in the surgical repair of hallux valgus deformity and its subsequent healing process.
For the treatment of bone fractures metal screws have been used for decades. Removal of material is the major disadvantage of conventional osteosynthesis and requires a second intervention, with all the complications and risks for each patient. Moreover, the metal screw disturbs as foreign material in the bone and irritates the surrounding soft tissue. In order to overcome the drawbacks of metal screws human bone screw grafts can be used instead representing a biodegradable osteosynthesis material with ideal material properties. The bone graft helps to create a solid, bony connection. This connection leads to an extension, a bone remodeling, bone installation and optimal reparation process in the affected area. This observational study is being conducted in order to overcome the lack of systematic research to objectively confirm the benefits of the product. In total 50 patients will be enrolled in this study in several centers in Austria This observational study will use Shark Screw® grafts manufactured by two tissue banks, the Austrian Tissue Bank surgebright and the German Institute for Cell and Tissue Replacement (DZIG). The Shark Screw® grafts were approved by the competent Austrian authority (AGES) in 2016. All patients participating in this observational study, due to a medical indication, undergo Hallux valgus correction according to the Austin procedure using the bone screws mentioned above. A 12 month postoperative observation period is set. Five routine follow-up examinations including clinical examination and x-ray analysis will be performed. In case the an additional routine follow-up examination is necessary for clinical reason within 24 month post-operative, the patient remains in the study.
Study Type
OBSERVATIONAL
Enrollment
50
All patients undergo Hallux valgus correction according to the Austin procedure using human bone graft screws.
A.ö. Bezirkskrankenhaus St. Johann in Tirol
Sankt Johann in Tirol, Tyrol, Austria
RECRUITINGKlinikum Wels-Grieskirchen
Wels, Upper Austria, Austria
RECRUITINGincidence of surgical revisions
Was a surgical revision done postoperatively? YES/NO
Time frame: 1 year
incidence of loosening of the screw
based on x-rays: Is a loosening of the screw visible? YES/NO
Time frame: 1 year
incidence of cracking of the screw
based on x-rays: Is a cracking of the screw visible? YES/NO
Time frame: 1 year
Hallux valgus angle
based on x-rays: What ist he Hallux valgus angle? °
Time frame: 1 year
Intermetatarsal angle
based on x-rays: What is the intermetatarsal angle? °
Time frame: 1 year
incidence of postoperative pseudoarthrosis
based on x-rays or MRI: Is a postoperative pseudoarthrosis visible? YES/NO
Time frame: 1 year
evaluation postoperative pain (VAS)
The visual analogue scale (VAS) is a vertical line, 10 centimeters (100 mm) in length, anchored by 2 verbal descriptors, one for each symptom extremes (0mm = no pain - 100mm = worst imaginable pain). A higher score indicates more pain.
Time frame: 1 year
duration of postoperative job-related incapacity
evaluation of duration
Time frame: 1 year
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Patient satisfaction (VAS)
The visual analogue scale (VAS) is a vertical line, 10 centimeters (100 mm) in length, anchored by 2 verbal descriptors, one for each symptom extremes (0mm = very satisfied - 100mm = not satisfied at all). A higher score indicates less satisfaction.
Time frame: 1 year
Assessment according to the AOFAS score
AOFAS (American Orthopaedic Foot and Ankle Society) Score evaluates the functional impairments of food and ankle. The AOFAS score consists of 8 questions in the categories pain (40 points), function (6 questions, total 45 points) and alignment (15 points). The scores of all questions are summed up to the total score. The maximum score is 100, where 100 is the best outcome and 0 is the worst outcome. All questions are to be answered relating to the previous week.
Time frame: 1 year