Retrospective and Prospective Evaluation of Hip Short Stem Performed by Anterior Approach (AMISP)

Evaluation of Short Femoral Stems in Hip Arthroplasty Using Anterior Approach

Recruiting
18 years or above
All
Phase N/A
400 participants needed
2 Locations

Brief description of study

This study aims to evaluate the clinical, radiographic, and perioperative outcomes of short femoral stems implanted during primary total hip arthroplasty performed through a minimally invasive direct anterior approach (DAA). Short femoral stems have been developed to preserve proximal femoral bone stock, potentially provide a more physiological load transfer, and facilitate implantation through less invasive surgical exposures, particularly in younger and more active patients.

The stem is a cementless hydroxyapatite-coated triple-tapered short stem, has been previously used because its design allows simplified femoral canal preparation and easier implant insertion during minimally invasive anterior approaches, where femoral exposure may be technically demanding. However, previous reports have shown conflicting results regarding implant survivorship and radiographic outcomes, including increased rates of radiolucent lines, pedestal formation, and stem subsidence, particularly among younger and more active patients.

The present study will investigate the technical and clinical implications of using short femoral stems through a minimally invasive anterior approach. Primary outcomes will include perioperative complication rates, wound characteristics, peri-incisional tissue condition, postoperative bleeding, and other surgery-related complications. Secondary outcomes will include postoperative pain, functional recovery, clinical outcome scores, implant survivorship, and serial radiographic findings at short- and mid-term follow-up.

Given the limited evidence currently available regarding the short- and mid-term performance of short femoral stems implanted through the direct anterior approach, this study aims to provide a comprehensive clinical and radiographic evaluation of these implants over time. Adverse events will be continuously monitored through scheduled clinical and radiographic assessments.

Eligibility of study

You may be eligible for this study if you meet the following criteria:

  • Conditions: Hip Arthritis
  • Age: 18 years or above
  • Gender: All

Inclusion Criteria:

  • Diagnosis of primary hip osteoarthritis or osteonecrosis
  • Minimally invasive direct anterior approach
  • Cementless femoral component
  • Minimum follow-up of 2 years
  • Patient willingness to participate in the study with written informed consent
  • Age over 18 years
  • Male or female patients

Exclusion Criteria:

  • Other diagnoses of secondary hip osteoarthritis
  • Non-anterior surgical approach
  • Cemented or other types of components
  • Patient unwillingness to participate in the study
  • Inadequate clinical and radiological documentation

This study investigates the use of short femoral stems in hip arthroplasty for patients with primary hip osteoarthritis or osteonecrosis. The purpose of this study is to evaluate the outcomes when these stems are implanted through a minimally invasive anterior approach.

The study focuses on understanding the safety and effectiveness of the short femoral stems. It evaluates the clinical and radiographic outcomes over time, monitoring for any surgery-related complications and changes in patient condition.

  • Who can participate: Adults over 18 years with primary hip osteoarthritis or osteonecrosis, who have undergone a minimally invasive direct anterior approach with a cementless femoral component, can participate. Participants must be willing to consent to the study.
  • Study details: Participants will receive a cementless hydroxyapatite-coated triple-tapered short stem. The study will involve regular clinical and radiographic assessments to monitor outcomes and adverse events.
  • Study timelines: The study will last a minimum of 2 years.
Updated on 21 May 2026. Study ID: AMISP 277/2025/Oss/IOR

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