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A Comparison of Two Different Surgical Techniques in Hip Resurfacing Arthroplasty

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00913679
Recruitment Status : Unknown
Verified November 2011 by University of Aarhus.
Recruitment status was:  Recruiting
First Posted : June 4, 2009
Last Update Posted : November 4, 2011
Aarhus University Hospital
Zimmer Biomet
Information provided by (Responsible Party):
University of Aarhus

Brief Summary:
The purpose of the study is to compare two different surgical techniques in hip resurfacing arthroplasty (RHA), comparing bloodflow and metabolism in the femoral head, as well as implant migration, periprosthetic bone mineral density, gait function and patient recovery.

Condition or disease Intervention/treatment Phase
Osteonecrosis Femoral Neck Fracture Implant Failure Procedure: Surgical approach (ReCap Hip Resurfacing System) Not Applicable

Detailed Description:


6700 total hip replacements are performed each year in Denmark due to osteoarthritis. Young patients sustain a substantial risk of early implant failure due to high-activity daily living, and among patients younger than 55 years at surgery 20 percent need revision surgery within ten years. Revision surgery is more complicated than primary surgery and associated with decreased implant longevity due to decreased bone stock. Resurfacing hip arthroplasty (RHA), restores the anatomy of the hip as only the articulating joint surfaces are replaced, and thus more bone is left to ensure a better opportunity of successful revision surgery later on. The clinical midterm evaluation of RHA survival is promising, but two major complications leading to early revision, namely osteonecrosis and femoral neck fracture, has raised concern regarding the influence of surgical technique on the vascularity of the femoral head. RHA is commonly performed through a posterolateral surgical approach. By this technique muscle tendons are spilt resulting in decreased patient mobility for several weeks after surgery, but more importantly, the blood supply is compromised as a large artery has to be ligated. This is speculated to decrease the blood supply to femoral head and neck and thereby increase the risk of osteonecrosis, femoral neck fracture, and implant failure. With a new surgical technique facilitating an anterolateral approach to the hip joint the blood supply is left intact as well as the muscle tendons.


An anterolateral surgical approach in resurfacing hip arthroplasty will 1) preserve the blood supply to the femoral head and neck and improve implant longevity, and 2) spare the muscle tendons and ease patient recovery.


50 patients, aged 30 to 60 years, with osteoarthrosis of the hip will be randomised to a RHA inserted by either an anterolateral or a posterolateral surgical approach. Primary points of evaluation are 1) blood supply to the femoral head and neck measured intraoperatively by Laser Doppler flowmetry and postoperatively by microdialysis established during surgery. Secondary points of evaluation are 1) implant fixation measured by radiostereometric analysis (RSA), and 2) periprosthetic bone mineral density (BMD) measured by dual energy x-ray absorptiometry (DEXA), 3) gait analysis and 4) clinical scores of function, pain and activities of daily living (Harris Hip Score , Visual Analogue Scale).

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 50 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Participant)
Primary Purpose: Treatment
Official Title: A Comparison of Two Different Surgical Techniques to Preserve the Bony Supply and Improve Implant Longevity in Hip Resurfacing Arthroplasty
Study Start Date : November 2008
Estimated Primary Completion Date : November 2013
Estimated Study Completion Date : November 2013

Arm Intervention/treatment
Active Comparator: Posterior approach
Posterior surgical approach in hip resurfacing arthroplasty
Procedure: Surgical approach (ReCap Hip Resurfacing System)
two different surgical approaches in hip resurfacing arthroplasty
Other Name: ReCap Hip Resurfacing System

Active Comparator: Anterolateral approach
Anterolateral surgical approach in hip resurfacing arthroplasty
Procedure: Surgical approach (ReCap Hip Resurfacing System)
two different surgical approaches in hip resurfacing arthroplasty
Other Name: ReCap Hip Resurfacing System

Primary Outcome Measures :
  1. femoral head blood flow, evaluated by Laser Doppler Flowmetry [ Time Frame: during surgery ]
  2. femoral head metabolism, evaluated by microdialysis [ Time Frame: 3 days ]

Secondary Outcome Measures :
  1. implant fixation, evaluated by RSA (radiostereogrammetric analysis) [ Time Frame: postoperatively; 3 months; 1,2 and 5 years ]
  2. periprosthetic bone mineral density, evaluated by DEXA [ Time Frame: pre- and postoperatively; 1 and 2 years ]
  3. gait function, evaluated by gait analysis [ Time Frame: preoperatively; 3 months and 1 year ]
  4. patient recovery, evaluated by Harris Hip Score and Visual Analogue Scale [ Time Frame: preoperatively and 3 months ]

Information from the National Library of Medicine

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Ages Eligible for Study:   30 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Primary hip OA;
  • Secondary hip OA due to mild and moderate acetabular dysplasia;
  • Sufficient bone quality for cementless acetabular component;
  • Suited for resurfacing of the femoral head, pre and intraoperatively assessed;
  • Age 30 to 60 years.

Exclusion Criteria:

  • Neuromuscular or vascular diseases in affected leg;
  • Patients found intra-operatively to be unsuited for a cementless acetabular component or cementing of the femoral component;
  • Need of NSAID postoperatively;
  • Fracture sequelae;
  • Females at risk of pregnancy, no safe contraceptives;
  • Severe hip dysplasia;
  • Sequelae from hip disease in childhood;
  • Medicine with large effect on bone density, K vitamin antagonists, loop-diuretics;
  • Alcoholism, females over 14 units per week, males over 21 units per week; AVN;
  • Osteoporosis.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00913679

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Contact: Nina Dyrberg Lorenzen, MD + 45 8949 7885
Contact: Kjeld Søballe, Professor, Dr. Med, MD +45 8949 7425

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Aarhus University Hospital, Department of Orthopaedic Surgery, Tage-Hansens Gade 2 Recruiting
Aarhus C, Aarhus County, Denmark, 8000
Principal Investigator: Nina D Lorenzen, MD         
Principal Investigator: Kjeld Søballe, Prof.         
Principal Investigator: Michael Ulrich-Vinther,, PhD         
Sponsors and Collaborators
University of Aarhus
Aarhus University Hospital
Zimmer Biomet
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Responsible Party: University of Aarhus Identifier: NCT00913679    
Other Study ID Numbers: 20070082
First Posted: June 4, 2009    Key Record Dates
Last Update Posted: November 4, 2011
Last Verified: November 2011
Keywords provided by University of Aarhus:
femoral neck fracture
implant fixation
implant failure
periprosthetic bone mineral density
gait function
gait analysis
patient recovery
Additional relevant MeSH terms:
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Femoral Neck Fractures
Fractures, Bone
Wounds and Injuries
Hip Fractures
Femoral Fractures
Hip Injuries
Leg Injuries
Bone Diseases
Musculoskeletal Diseases
Pathologic Processes