Hip Socket Erosion Study

The aim of this exploratory retrospective study is to gain a better understanding about the occurrence of acetabular erosion in patients after after hip hemiarthroplasty. The main objectives are i) to summarise a selection of basic patient characteristics of all patients of ≤ 75 years of age with a femoral neck fracture who have received either HA or THA, ii) to explore the proportion of patients after HA who developed acetabular erosion in the first years post-surgery and iii) to explore the proportion of patients after HA for whom acetabular erosion was the main reason for conversion surgery from HA to THA. A secondary objective is to assess the observer reliability of, and explore the association between, the Baker classification grading and Köhler line measurements.

All participants approached for participation in the main phase of the study will be asked to give their written informed consent to use their patient data. Patients who are willing to participate will also be asked to complete a short paper survey to collect data that is not available from their health records.

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Key information

Conditions

Femoral Neck Fractures Acetabulum; Protrusion Femoral Fractures Fractures, Bone Hemiarthroplasty Hip Fractures Hip Injuries Leg Injuries Wounds and Injuries

Age range

Up to 76 year

Sex eligibility

All sexes

Study type

Observational

Primary location

Rijnstate Hospital, Arnhem, Gelderland, Netherlands

About this study

Some orthopaedic surgeons believe that relatively 'young' older patients (aged ≤ 75 years) who have sustained a femoral neck fracture should be treated with hemiarthroplasty (HA) instead of total hip arthroplasty (THA). The rationale behind this belief is that THA is more time consuming, has greater associated surgical morbidity and may increase the risk of hip dislocation and subsequent revision surgery. On the other hand, HA is believed to accelerate acetabular erosion (i.e. wear) over time, which may ultimately lead to the need for conversion surgery from HA to THA. Due to a lack of research in this area, it is unclear how often the development of acetabular erosion in patients after HA actually occurs. This makes it difficult for orthopaedic surgeons to make an informed choice between HA or THA surgery for this patient group.

This is an exploratory retrospective study using existing electronic patient data of patients adhering to the inclusion criteria of the study, i.e. patients of ≤ 75 years of age who have had HA after a femoral neck fracture.

Who can participate

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

having had a displaced femoral neck fracture that was subsequently treated with hemiarthroplasty
aged < 75 years at the time of surgery
have at least two post-operative radiographs (with at least six weeks between them) available for acetabular erosion measurements.

Exclusion criteria

patients diagnosed with rheumatoid arthritis, osteoporosis, hip dysplasia or a previous hip fracture of the ipsilateral hip.

Treatment and study plan

Primary outcomes

The proportion of patients with acetabular erosion

Time frame: Up to 15 years after index surgery

The proportion of patients after HA who have developed acetabular erosion in the years post-surgery.

Secondary outcomes

The frequency of patients who have had conversion surgeries

Time frame: Up to 15 years after index surgery

The number (frequency) of patients who have had conversion surgery after the index surgery.

Sponsors and collaborators

Lead sponsor

Rijnstate Hospital

Other

Collaborators

Isala
Jeroen Bosch Ziekenhuis
Maxima Medical Center
Noordwest Ziekenhuisgroep

Registry information

Official study title

Development of Acetabular Erosion After Hemiarthroplasty: an Exploratory Retrospective Study

Acronym: HIPSTER

Important dates

Study start: 2024
Primary completion: 2025
Study completion: 2025
First posted: Oct 24, 2023
Registry last updated: Jun 25, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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