Osteoporosis Clinical Trial
— DensiprobeOfficial title:
Prospective Multicenter Cohort Study to Evaluate the Influence of Bone Strength Measured by DensiProbe Hip on Bone Related Fixation Failure in Patients With Hip Fractures Undergoing DHS Surgical Treatment.
Verified date | October 2011 |
Source | AO Clinical Investigation and Documentation |
Contact | n/a |
Is FDA regulated | No |
Health authority | Switzerland: Ethikkommission |
Study type | Interventional |
Hip fractures mostly occur in elderly people with low bone strength. Bone strength is
determined by bone mineral density (BMD), bone turnover, microarchitectural and geometrical
properties of the bone. Dual energy x-ray absorptiometry (DXA) is the standard technique to
measure BMD. However, BMD just provides information regarding the quantity of mineral in
bone, which is only one component of bone strength. To date there is no reliable method to
assess bone strength in vivo. Therefore, a method to assess bone strength beyond BMD would
provide additional information regarding the patients' risk of bone related fixation failure
after fracture fixation.
DensiProbe is a new diagnostic device that was developed for intra-operative assessment of
mechanical stability of the bone in the proximal femur. It consists of a drill bit like tool
and an electronic system to measure the peak torque to break-away of trabecular bone in the
femoral head of patients undergoing DHS surgical treatment. In a cadaver study comparing
bone mineral density measured by quantitative computed tomography with bone strength
measured by DensiProbe a high correlation between these two parameters could be shown. In a
clinical pilot study a significant correlation between DensiProbe measurements and BMD
measured by DXA at the femoral neck in patients with hip fractures could be shown. However,
no perfect correlation was expected because DensiProbe measures bone strength, which is only
partly caused by BMD.
Bone related fixation failure, such as secondary loss of reduction, is influenced by bone
strength, bone mineral density, fracture type, fracture reduction and primary positioning of
the implant. The predictive value of DensiProbe measurements for secondary loss of reduction
needs to be investigated. If DensiProbe turned out to be an effective screening tool for
patients with low bone strength that are on higher risk of the aforementioned complications
these patients may in future benefit from alternative treatment methods (e.g. augmentation
techniques) in order to reduce bone related fixation failure.
The primary aim of the present study is to investigate if bone strength measured by
DensiProbeTM Hip (DensiProbe) is an independent factor to predict secondary loss of
reduction (screw migration of 5 mm or more and / or telescoping of 10 mm or more) in
patients with hip fractures after fracture fixation with DHS.
Status | Terminated |
Enrollment | 198 |
Est. completion date | September 2011 |
Est. primary completion date | September 2011 |
Accepts healthy volunteers | No |
Gender | Both |
Age group | 50 Years and older |
Eligibility |
Inclusion Criteria: - Patients 50 years or older - Patients with trochanteric or femoral neck fractures, classified as: AO 31-A1, AO 31-A2, AO 31-A3, AO 31-B1, AO 31-B2, AO 31-B3 - Patients undergoing fixation with DHS (135° aiming device, anti-rotational K-wire) - Patients willing to participate in the study according to the clinical investigation plan - Patients able to understand and read country national language at an elementary level - Signed written informed consent by the patient or legal guardian Exclusion Criteria: - Bilateral hip fractures (at present or in the past) - Open hip fracture - Any previous surgical procedures of the hip (ipsilateral / contralateral) - More than 7 days between injury and surgery - Polytrauma (multiple injuries, whereof one or the combination of several injuries is life-threatening) - Patients being pregnant or breast-feeding - Pathologic fractures - Active malignancy - Psychiatric disorders that would preclude reliable assessment (e.g. severe depression) - Drug or alcohol abuse - Patients having participated in any other device or drug related clinical trial within the previous month |
Allocation: Non-Randomized, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Diagnostic
Country | Name | City | State |
---|---|---|---|
Austria | Medizinische Universität | Innsbruck | |
Austria | Wilhelminenspital | Wien | |
Germany | Medizinische Hochschule Hannover | Hannover | |
Germany | Friedrich-Schiller Universität | Jena | |
Germany | Universitätsklinikum Münster | Münster | |
Netherlands | Twenteborg Ziekenhuis Almelo | Almelo | |
Switzerland | Universitätsspital | Basel | BS |
Switzerland | Stadtspital Triemli | Zürich |
Lead Sponsor | Collaborator |
---|---|
AO Clinical Investigation and Documentation |
Austria, Germany, Netherlands, Switzerland,
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Migration of the screw in relation to the femoral head of 5 mm or more and/or Telescoping (shortening of the femoral neck) of 10 mm or more | 3 months | No | |
Secondary | Rate of complications | 3 months | No | |
Secondary | BMD values measured by DXA (contralateral hip) | Post OP | No | |
Secondary | Parker mobility score | 3 months | No |
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