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- Title
Polyethylene liner motion in dual-mobility hip prostheses: static and dynamic radiostereometry in 16 patients 1 year after operation.
- Authors
JØRGENSEN, Peter Bo; KAPTEIN, Bart L.; SØBALLE, Kjeld; JAKOBSEN, Stig S.; STILLING, Maiken
- Abstract
Background and purpose -- Dual-mobility hip arthroplasty utilizes a freely rotating polyethylene acetabular liner to protect against dislocation. As liner motion has not been confirmed in vivo, we undertook this using dynamic radiostereometry (RSA). Patients and methods -- 6 patients with Anatomical Dual Mobility acetabular components were included. Markers were implanted in the liners using a drill guide. Static RSA recordings and patient-reported outcome measures were obtained postoperatively and at 1-year follow-up. Dynamic RSA recordings were obtained at 1-year follow-up during passive hip movement: abduction/external rotation, adduction/internal rotation (modified FABER--FADIR), to end-range and at 45° hip flexion. Liner and neck movements were described as anteversion, inclination, and rotation. Results -- Liner movement during modified FABER-- FADIR was detected in 12 of 16 patients. Median (range) absolute liner movements were: anteversion 10° (5--20), inclination 6° (2--12), and rotation 11° (5--48) relative to the cup. Median absolute change in the resulting liner/neck angle (small articulation) was 28° (12--46) and in liner/cup angle (larger articulation) was 6° (4--21). Static RSA showed changes in median liner anteversion from 7° (12 to 23) postoperatively to 10° (3 to 16) at 1-year follow-up and inclination from 42° (35--66) postoperatively to 59° (46--80) at 1-year follow-up. Liner/neck contact was associated with high initial liner anteversion (p = 0.01). Interpretation -- The polyethylene liner moves over time. 1 year after surgery the liner can move with or without liner/neck contact. The majority of movement is in the smaller articulation between head and liner.
- Subjects
NECK physiology; HIP joint physiology; PATIENT aftercare; RADIOSTEREOMETRY; TOTAL hip replacement; POLYETHYLENE; HEALTH outcome assessment; POSTOPERATIVE period; ROTATIONAL motion; DESCRIPTIVE statistics
- Publication
Acta Orthopaedica, 2022, Vol 93, p375
- ISSN
1745-3674
- Publication type
Article
- DOI
10.2340/17453674.2022.2253