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[Radiological analysis of the thrust plate prosthesis (TPP)]
B A Ishaque1, S Wienbeck, E Basad
1Klinik für Orthopädie und Orthopädische Chirurgie der Justus-Liebig-Universität Giessen. BAISHAQUE@AOL.COM
Zeitschrift Fur Orthopadie Und Ihre Grenzgebiete
|February 18, 2004
Summary
Radiological changes after thrust plate prosthesis (TPP) implantation can indicate either physiological adaptation or loosening. Progressive radiolucencies in sector B suggest prosthesis loosening, aiding in accurate diagnosis.
Area of Science:
- Orthopedic surgery
- Radiology
- Biomedical engineering
Background:
- The thrust plate prosthesis (TPP) is used in orthopedic procedures.
- Radiological assessment is crucial for monitoring TPP outcomes.
- Distinguishing between normal adaptation and pathological loosening is essential.
Purpose of the Study:
- To demonstrate radiological changes following TPP implantation.
- To classify findings into pathological and non-pathological categories using a standardized system.
- To identify indicators of TPP loosening.
Main Methods:
- Analysis of radiological follow-ups for 167 TPP implants (1993-1998).
- Standardized follow-up schedule: postoperative, 6 months, and annual reviews.
- Radiological assessment in anterior-posterior view, divided into four sectors (A, B, C, D).
Main Results:
- Radiolucencies were common in sectors A (34.7-18%) and C (44%).
- Progressive radiolucencies in sector B (6%) were identified as a sign of loosening (thickness ≥ 2 mm).
- Extended atrophy under the lateral plate also indicated loosening.
Conclusions:
- Radiological changes post-TPP implantation represent physiological adaptations or loosening.
- Stress-shielding can cause atrophy under the plate and sclerosis above the calcar femoris.
- Progressive radiolucency in sector B is a key indicator of TPP loosening.