Porous Tantalum Rods Improve the Hip Joint Function of Patients With Avascular Necrosis of the Femoral Head

2016-08-25 12:23:21 | BioPortfolio


To confirm 1) whether, compared with core decompression alone, core decompression with porous tantalum rod implantation improves the hip joint function of patients with avascular necrosis of the femoral head after femoral neck fracture surgery, 2) whether porous tantalum rod shows favorable biocompatibility with the human body, and 3) whether this treatment method is feasible for treating avascular necrosis of the femoral head after femoral neck fracture surgery.


History and current status of related studies: Femoral neck fracture can render the blood supply to the femoral head insufficient, leading to avascular necrosis of the femoral head. This often increases treatment difficulty and can have a strong influence on the recovery of hip joint function. Although core decompression for treatment of avascular necrosis of the femoral head has been largely used in clinical settings, the mid-term therapeutic effects are not satisfactory in some patients.

Biocompatibility is defined as the ability of a biomaterial, prosthesis, or medical device to perform with an appropriate host response. The biocompatibility of a bone implant and host influences the therapeutic effects. Therefore, biomaterials that are less likely to induce negative host responses may increase the therapeutic effects of such treatments for orthopedic diseases. A porous tantalum rod is a bone trabecula-like metal implant that is used to support weight-bearing areas of necrotic bone, preventing further collapse of the necrotic area. This implant has exhibited favorable effects in the early treatment of avascular necrosis of the femoral head. Although previous reports have focused on porous tantalum rod implantation for clinical treatment of avascular necrosis of the femoral head after fermoral neck fracture, few have assessed the long-term therapeutic effects or biocompatibility of porous tantalum rods.

Adverse events Possible adverse events include any expected or unexpected symptoms. If severe adverse events occur, information including the date of occurrence and measures taken related to the treatment of the adverse events will be reported to the principal investigator and the institutional review board within 24 hours.

Data collection, management, analysis, and open access Data collection: Case report forms with demographic data, disease diagnosis, accompanying diseases, drug allergy history, and adverse events will be collected , processed using Epidata software, collated, and then electrically recorded using a double-data entry strategy by data managers.

Data management: The locked electronic database will not be altered in any way, and will only be available to the project manager. Paper and electronic data regarding screening, informed consent, and clinical outcomes will be preserved at the Affiliated Hospital of Nantong University, China.

Data analysis: The electronic database will be made available to a professional statistician for statistical analysis. An outcome analysis report will be made by the statistician and submitted to the lead researchers. An independent data monitoring committee will supervise and manage the trial data with the goal of ensuring a scientific and stringent trial process, resulting in accurate and complete data.

Data open access: Anonymized trial data will be published at

Statistical analysis Statistical analysis will be performed by a statistician using SPSS 19.0 software and will follow the intention-to-treat principle. Normally distributed measurement data will be expressed as a mean, standard deviation, min, and max. Non-normally distributed measurement data will be expressed as a lower quartile (q1), median, and upper quartile (q3). McNemar's test will be used to compare the percentage of patients with excellent hip joint function as per Harris hip scores 12 months after surgery, the percentage of patients presenting with femoral head collapse, prosthesis loosening, peri-prosthesis infection, and incidence of complications 6 and 12 months after surgery. The Mann-Whitney U test will be used to compare the VAS score prior to and 1, 6, and 12 months after surgery. Statistical significance will be accepted when α = 0.05.

Study Design

Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment


Femoral Neck Fracture


porous tantalum rod, core decompression


Qinghai University Affiliated Hospital




Qinghai University

Results (where available)

View Results


Published on BioPortfolio: 2016-08-25T12:23:21-0400

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Medical and Biotech [MESH] Definitions

Hip deformity in which the femoral neck leans forward resulting in a decrease in the angle between femoral neck and its shaft. It may be congenital often syndromic, acquired, or developmental.

A groin hernia occurring inferior to the inguinal ligament and medial to the FEMORAL VEIN and FEMORAL ARTERY. The femoral hernia sac has a small neck but may enlarge considerably when it enters the subcutaneous tissue of the thigh. It is caused by defects in the ABDOMINAL WALL.

Fractures of the FEMUR HEAD; the FEMUR NECK; (FEMORAL NECK FRACTURES); the trochanters; or the inter- or subtrochanteric region. Excludes fractures of the acetabulum and fractures of the femoral shaft below the subtrochanteric region (FEMORAL FRACTURES).

Tantalum. A rare metallic element, atomic number 73, atomic weight 180.948, symbol Ta. It is a noncorrosive and malleable metal that has been used for plates or disks to replace cranial defects, for wire sutures, and for making prosthetic devices. (Dorland, 28th ed)

Hip deformity in which the angle between the femoral neck and its shaft is increased. It may be congenital, acquired, or developmental.

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