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Minimal Invasive Surgery in Total Hip Arthroplasty Patients; Short- and Long Term Results

This study is ongoing, but not recruiting participants.
St. Olavs Hospital
Information provided by (Responsible Party):
Norwegian University of Science and Technology Identifier:
First received: December 9, 2011
Last updated: April 16, 2014
Last verified: April 2014

The aim of the present study is to explore the most efficient surgical approach in total hip replacement in short and long term when concerning strength, functionality and postoperative complications.

The objective is to register muscular strength, hip joint functionality/mobilisation and complications after total hip arthroplasty (THA) performed by two minimal invasive/incision surgeries (MIS) versus the traditionally lateral approach.

The primary working hypothesis is that due to a minimal dissection and reduced trauma in the muscles, patients will tolerate early hospital discharge better after MIS than after traditional lateral surgery. Patients in the MIS group will also be more active and maintain muscular strength and hip joint functionality/mobilisation better than patients in the lateral group.

Condition Intervention
Hip Osteoarthritis
Procedure: Total hip replacement

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Minimal Invasive Surgery in Total Hip Arthroplasty Patients; Short- and Long Term Results

Resource links provided by NLM:

Further study details as provided by Norwegian University of Science and Technology:

Primary Outcome Measures:
  • Abductor muscle strength [ Time Frame: 3 months postoperatively ] [ Designated as safety issue: No ]
    Measured by 1 repetition maximum (1 RM)

Secondary Outcome Measures:
  • Hip joint functionality and mobility [ Time Frame: 3 months postoperatively ] [ Designated as safety issue: No ]
    Measured by patient completed questionnaires and clinician reported scores

  • activity level [ Time Frame: 6 subsequent days postoperatively ] [ Designated as safety issue: No ]
    Measured by an activity monitor

Estimated Enrollment: 60
Study Start Date: September 2011
Estimated Study Completion Date: September 2016
Primary Completion Date: April 2014 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: Direct lateral Procedure: Total hip replacement
Total hip replacement; direct lateral approach
Experimental: Minimal invasive Procedure: Total hip replacement
Total hip replacement; minimal invasive approach
Experimental: Modified minimal invasive Procedure: Total hip replacement
Total hip replacement; modified minimal invasive approach

Detailed Description:

With total hip replacement surgery, the orthopaedic surgeon's aim is not only pain relief for the patient, but also restoration of hip joint biomechanics resulting in a minimal functional deficit and maximal longevity of the implant. It is not exceptional that these patients still experience mild to moderate long-term impairments postoperatively. These impairments include pain, muscle weakness of the hip abductors, contracture of the hip, gait disorders, as well as weakness of hip extensors and flexors. These problems may in turn lead to complications such as joint instability and loosening of the implant. When the lateral surgical approach is used, major concerns after total hip replacement surgery are muscle abductor weakness/atrophy, tendon defects of the gluteus minimus muscle, and unsuccessful reattachment or denervation of the anterior gluteal flap.

Minimal incision/invasive surgery (MIS) is defined as a surgical approach performed through a short skin and muscle incision to avoid injury to muscles and tendons. Following minimally invasive approach reduced muscle trauma has been found. Moreover clinical outcome improved, as the gluteus medius muscle can be spared more successfully. However, it is debated whether or not the overall results of MIS are superior, or even as good as the traditional hip replacement surgery in terms of component placing and time to revision of the prosthesis.


Ages Eligible for Study:   up to 70 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients scheduled for THA
  • Diagnosis of primary osteoarthritis as the main cause for elective THA
  • American Society of Anesthesiologists (ASA) score I, II, and stable III

Exclusion Criteria:

  • Musculoskeletal diseases
  • Current heart/pulmonary- or malignant diseases likely to influence the physical testing performance.
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Please refer to this study by its identifier: NCT01506024

St. Olavs Hospital
Trondheim, Norway
Sponsors and Collaborators
Norwegian University of Science and Technology
St. Olavs Hospital
Principal Investigator: Siri Bjørgen, PhD Norwegian University of Science and Technology
  More Information

No publications provided

Responsible Party: Norwegian University of Science and Technology Identifier: NCT01506024     History of Changes
Other Study ID Numbers: 2011/450
Study First Received: December 9, 2011
Last Updated: April 16, 2014
Health Authority: Norway:National Committee for Medical and Health Research Ethics

Keywords provided by Norwegian University of Science and Technology:
Arthroplasty, Replacement, Hip
Surgical Procedures, Operative
Surgical Procedures, Minimally Invasive

Additional relevant MeSH terms:
Osteoarthritis, Hip
Joint Diseases
Musculoskeletal Diseases
Rheumatic Diseases processed this record on November 24, 2014