Midterm follow-up study of metal on metal total hip replacement
Journal Title: International Journal of Orthopaedics Sciences - Year 2018, Vol 4, Issue 1
Abstract
Background: Metallosis and pseudotumors are long discussed complications with metal on metal bearing total hip replacement which has increased the rate of revision total hip replacements in these patients. Aims and Objective: To evaluate the levels of metal ion (Cobalt and Chromium), factors affecting theses metal ion levels and incidence of pseudotumors in metal on metal total hip replacement patients. Materials And Methods: Prospective descriptive study done on 25 patients who had metal on metal bearing surface replacement and total hip replacement with a mean post-op period of 6 years. Serum metal ion levels (Cobalt and Chromium), MARS-MRI (Metal Artifact Reduction Sequence) and acetabular cup inclination angle on X-rays and functional score were recorded in theses patients on two follow-up visits with mean follow-up period of 1 year. Result: Mean cobalt was 1.64 and mean chromium was 3.06. 28% of the study population showed asymptomatic pseudotumors but were less than 5cm. Mean cup inclination angle was 41.8* on X-rays which did not have any influence on serum metal ions and functional score. Gender (Male / Female) and type of arthroplasty (Articular surface replacement / Total hip replacement) has no affect on serum metal ions. Functional scores of these metal on metal patients comparable to metal on polyethylene bearing patients. Revison total hip replacement done in one metal on metal THR patient who had a dislocated cup in his second follow-up. Conclusion: Metal on metal hip arthroplasty patients were functionally doing well like the regular metal on polyethylene patients. Chromium values were significant and higher than cobalt. Incidence of asymptomatic pseudotumors was 28%.
Authors and Affiliations
Dr. Jai Thilak, Dr. Aravind Madanan
Keywords
Related Articles
- EP ID EP485529
- DOI 10.22271/ortho.2018.v4.i1l.118
- Views 95
- Downloads 0
Percutaneous tenotomy of the Achilles tendon using a 16 gauge needle in the management of clubfoot
Objective: To clinically evaluate, the effectiveness of percutaneous tenotomy of Achilles tendon using a 16 gauge needle in clubfoot treatment by ponseti technique. Material and methods: Forty five affected foot were pro...
Evaluation of functional outcomes of a modified technique for percutaneous pinning of proximal humeus fracture
Introduction: Proximal humeral fractures are extremely common injuries, and are one of the true osteoporotic fractures. For those that have moderate to severe displacement, the optimal treatment for the patient has not b...
Outcome analysis of vitamin-D supplementation in patients with fibromyalgia
Objective: To investigate the vitamin D level and score the pain of fibromyalgia (FM) using VAS scoring at pre- planned intervals. Materials and Methods: 50 patients presenting with FM, treated with vitamin D supplementa...
A prospective study for definitive diagnosis of various arthropathies by synovial fluid analysis and percutaneous needle biopsy of synovium
Objectives: To evolve a diagnostic pattern of synovial fluid analysis, thus determining the usefulness of routine synovial fluid analysis as a simple diagnostic aid in various forms of arthritis. Background: Synovial flu...
Comparison of different treatment modalities for tibial fractures: A clinical study
Background: The management of unstable distal tibia fractures remains Challenging. The proximity to the ankle makes the surgical treatment more complicated. The present study was carried out to compare different treatmen...