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Related Experiment Videos

Structural differences between hip endoprostheses, and implications on a hip kinetics.

Mirza Biscević1, Dragica Smrke

  • 1Department of Orthopedics and Traumatology, Clinical centre Sarajevo, Bosnia and Herzegovina.

Bosnian Journal of Basic Medical Sciences
|December 15, 2005
PubMed
Summary

Bipolar hip endoprostheses (BPEP) offer superior range of motion and kinetic advantages compared to unipolar partial hip endoprostheses (UPEP) and total hip endoprostheses (TEP) after hip fracture surgery. These benefits stem from BPEP

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Rehabilitation Medicine

Background:

  • Displaced femoral neck fractures often require hip endoprostheses.
  • Unipolar partial hip endoprosthesis (UPEP), bipolar partial hip endoprosthesis (BPEP), and total hip endoprosthesis (TEP) are common surgical options.
  • Comparing the functional outcomes and kinetic characteristics of these prostheses is crucial for patient recovery.

Purpose of the Study:

  • To compare the kinetic characteristics and range of motion (ROM) of UPEP, BPEP, and TEP in patients with dislocated femoral neck fractures.
  • To identify which hip endoprosthesis type offers superior functional outcomes based on ROM measurements.

Main Methods:

  • Ninety patients with dislocated femoral neck fractures were divided into three groups (30 each): UPEP, BPEP, and TEP.

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  • Patients were paired based on factors influencing long-term results (follow-up period, comorbidities, pre-injury function).
  • Hip range of motion (flexion, extension, abduction, adduction, internal/external rotation) was measured after an average follow-up of 3.8 years.

    • Main Results:

    • Bipolar hip endoprostheses (BPEP) demonstrated the largest mean amplitudes in flexion (104°), extension (13°), abduction (35°), and external rotation (38°).
    • Unipolar partial hip endoprostheses (UPEP) showed the largest adduction (14°), while total hip endoprostheses (TEP) yielded the largest internal rotation (34°).
    • Differences in ROM correlated with clinical parameters (hip pain, gait, age, rehabilitation), with ROM measurement being a reliable, objective clinical assessment.

    Conclusions:

    • Bipolar hip endoprostheses (BPEP) exhibit favorable kinetic advantages over UPEP and TEP, likely due to their biomechanical structure (two-level mobility, thinner neck).
    • The less invasive nature of BPEP surgery compared to TEP may contribute to clinical advantages.
    • BPEP appears to be a promising option for improving hip function after fracture, offering a balance of mobility and surgical approach.