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NCT Number: NCT06768541

Subsidence of Short Stem THA With DORR Type C

Total hip arthroplasty (THA) is a widely accepted procedure for the treatment of end-stage hip osteoarthritis. Neck preserving short stems have gained popularity in recent years, as they aim to preserve proximal femoral bone stock and enable a more physiological load transfer. However, the use of these stems in patients with specific femoral deformities, such as DORR Type C femurs, can present unique challenges. DORR Type C femurs are characterized by decreased cortical bone thickness and increased medullary canal width, which can impact the fit and stability of the femoral stem component. Short stem total hip arthroplasty has emerged as a potential solution for these patients, as it aims to preserve proximal femoral bone stock and improve load transfer to the surrounding bone. This study seeks to investigate the measured subsidence of short stem total hip arthroplasty in patients with DORR Type C femur configuration and the clinical outcomes associated with this approach.

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Key information

Conditions

Hip Osteoarthritis Arthritis Joint Diseases Musculoskeletal Diseases Osteoarthritis Osteoarthritis, Hip Rheumatic Diseases Short Stem Prosthesis Total Hip Arthroplasty (THA)

Age range

18 year and older

Sex eligibility

All sexes

Study type

Observational

Primary location

Ordensklinikum Linz Barmherzige Schwestern

Linz, 4010, Austria

About this study

In hip arthroplasty, short stems represent a key advancement in the field of bone-preserving surgical techniques. Due to the relatively rapid establishment of short stems, the data situation is lagging behind in some areas, resulting in uncertainties in the indication in certain cases. One of these cases is proximal femurs with a Dorr type C configuration. This bone characteristic complicates the implantation of stems due to a thin cortical bone and a wide femoral canal and has been shown to lead to an increased complication rate. The aim of this study is to evaluate the clinical and radiological outcome of short stem implantation in Dorr type C femur. The study will include all patients who underwent implantation of the "Optimys" short stem from Mathys between January 1, 2018 and December 31, 2020 at the hospital Ordensklinikum Linz Barmherzige Schwestern. In addition, patients must have a type C femur according to Dorr. During a follow-up period of at least two years, the Harris Hip Score, the UCLA Activity-level Scale and the Singh Index are used to evaluate the clinical course. Radiological evaluation is carried out using pre- and postoperative X-rays, which together enable an EBRA-FCA.

A statement on the migration behavior of the cementless implanted short stem in Dorr type C femur is expected. To date, it has been controversially discussed whether a Dorr type C femur provides enough structural support to achieve good primary stability for a cementless implanted short stem with tapered-wedge design. If this were not the case, the excessive migration behavior would lead to subsidence and subsequently to aseptic stem loosening and even complete failure of the prosthesis.

Who can participate

Healthy volunteers accepted: No

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

Inclusion criteria

  • THA using Optimys short stem from 1.1.2018 bis 31.12.2020 in the institution.
  • Typ C Femur according to Dorr

Exclusion criteria

  • none

Treatment and study plan

THA using a short stem

Procedure

Total Hip Arthroplasty using a collarless, triple-tapered cementless short stem (Optimys, produced by Mathys).

Primary outcomes

  1. Stem Subsidence

    Time frame: 2 years

    Subsidence of the femoral stem, measured in mm

Secondary outcomes

  1. HHS

    Time frame: 2 years

    Harris Hip Score, 0-100 points. 0 points indicate worst, 100 points indicate best outcome.

  2. OHS

    Time frame: 2 years

    Oxford Hip Score, 0-48points 0 points indicate worst, 48 points indicate best outcome.

  3. SF-12

    Time frame: 2 years

    Short Form 12, 12 questions with 0-100 points. 0 points indicate worst, 100 points indicate best outcome. Norm-Based-Scoring is used.

Sponsors and collaborators

Lead sponsor

Krankenhaus Barmherzige Schwestern Linz

Other

Registry information

Official study title

Short Stem Total Hip Arthroplasty in Patients With DORR Type C Femur Configuration: Measured Subsidence

Important dates

Study start
2023
Primary completion
2024
Study completion
2025
First posted
Jan 10, 2025
Registry last updated
Mar 12, 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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