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Biomechanical Analysis of Proximal Fitting-Distal Filling Stem and Proximal Fitting- Distal Tapered Stem in Cementless Hip Prosthesis: A 3 Dimensional Finite Element Study / 대한정형외과학회잡지
The Journal of the Korean Orthopaedic Association ; : 279-286, 2001.
Article in Korean | WPRIM | ID: wpr-648997
ABSTRACT

PURPOSE:

This study was undertaken to compare the initial micromotion and stress shielding of a "fit and fill" stem to a "proximal fitting and distal tapered" stem in the early postoperative period using the load simulating single leg stance and stair climbing. MATERIALS AND

METHODS:

Using the data from 3-D human CT scan, authors developed two types of 3-dimensional finite element total hip replacement model of proximal femur, which were inserted with a "fit and fill" stem and a "proximal fitting and distal tapered" stem. The constructions of stems were based on the OmnifitTM stem (about 13,000 element & 20,000 nodes). We compared micromotion, maximal principal stress and strain energy of each stems.

RESULTS:

The results indicate that micromotion in a fit and fill stem were slightly lower than that of a tapered stem, especially in stair climbing over that in the single leg stance. The maximum principal stress on the cortex of femur was slightly higher in a tapered stem in the case of single leg stance, and 2 times higher in the case of stair climbing. Strain energy also was much higher in a tapered stem in both single leg stance and stair climbing gait.

CONCLUSION:

These findings indicate that a tapered stem design could provide more favorable biomechanical benefits rather than a fit & fill stem after cementless total hip replacement.
Subject(s)

Full text: Available Index: WPRIM (Western Pacific) Main subject: Postoperative Period / Tomography, X-Ray Computed / Arthroplasty, Replacement, Hip / Femur / Gait / Hip / Hip Prosthesis / Leg Type of study: Prognostic study Limits: Humans Language: Korean Journal: The Journal of the Korean Orthopaedic Association Year: 2001 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Postoperative Period / Tomography, X-Ray Computed / Arthroplasty, Replacement, Hip / Femur / Gait / Hip / Hip Prosthesis / Leg Type of study: Prognostic study Limits: Humans Language: Korean Journal: The Journal of the Korean Orthopaedic Association Year: 2001 Type: Article