Liver Diseases, Osteoporosis, Transplant-Related Disorder
Conditions
Keywords
Bone microarchitecture
Brief summary
Fifty patients awaiting liver transplantation and 50 age and gender matched control subjects with normal liver function will be included in the study. The aim of this project is to compare liver transplantation recipients'bone microarchitecture with healthy controls and to evaluate patients' changes within one year after transplantation
Detailed description
Background: Solid organ transplantation recipients have a high prevalence of osteoporosis and fragility fractures. Deteriorated bone architecture has been shown by high resolution computed tomography (HR-pQCT) in kidney and lung transplantation recipients. In liver transplantation (LeTx) recipients, bone microarchitecture has only been evaluated using the trabecular bone score in a retrospective cohort study; a degraded or partially degraded microarchitecture was detected in most of the patients. Aim: The aim of this project is to compare LeTx recipients' bone microarchitecture with healthy controls and to evaluate patients' changes within one year after transplantation. Methods: HR-pQCT scans of the distal radius and tibia as well as areal bone mineral density measurement of the lumbar spine and hip region will be performed before Tx, 1 and 12 months after Tx in 50 patients. Anabolic and catabolic markers of bone turnover (sclerostin, dickkopf 1, periostin) and traditional bone turnover markers will be evaluated preoperatively, on the day of surgery, and 4 times within the first year after LeTx. In healthy age- and sex-matched controls HR-pQCT, bone mineral density and laboratory parameters will be assessed once. Hypotheses: Based on the HR-pQCT data of kidney and lung transplantation recipients and the trabecular bone score of LeTx recipients, the investigators hypothesize that LeTX recipients have deteriorated bone microarchitecture. Expected outcome: Since bone fragility is not only determined by BMD but bone architecture as well, HR-pQCT data give important information on the patients' bone fragility. The knowledge of the course of bone microarchitecture after liver transplantation may help to develop strategies preventing fragility fractures in LeTx recipients.
Interventions
None listed
Sponsors
Medical University of Vienna
Study design
Observational model
CASE_CONTROL
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
20 Years to 70 Years
Healthy volunteers
Yes
Inclusion criteria
* Women, men awaiting liver Transplantation * 20-70 years of age
Exclusion criteria
* Subjects with a history of prior solid organ transplantation * Subjects awaiting a combined liver-kidney transplantation * Cancer within the previous 5 years - except for hepatocellular carcinoma, neuroendocrine tumors and hemangioendothelioma with indication for liver transplantation * Rheumatoid arthritis * Severe renal insufficiency (chronic kidney disease IV, V) * Immobilisation * Intake of drugs with potential effects on BMD like lithium, estrogen-replacement therapy, selective Estrogen-receptor modulators, oral bisphosphonates in the last three months, denosumab and parenteral bisphosphonates in the last year - except calcium, vitamin D and medication necessary for the underlying disease * Non-osteoporotic bone disease * Recent fragility fracture within 6 months Control group: Inclusion Criteria: * Women, men * 20-70 years of age * Normal liver function (defined as liver function parameters and transaminases, such as albumin, thromboplastin time, alanine-aminotransferase, aspartate-aminotransferase, and gamma-glutamyl-transferase within the normal range) Additional
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Bone microarchitecture of the distal radius | 12 months to posttransplantation | trabecular bone mineral density measurement (XCT) |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Bone microarchitecture of the distal radius | pretransplantation to 12 after transplantation | bone volume fraction (%) |
Other
| Measure | Time frame | Description |
|---|---|---|
| Bone mineral density | pretransplantation to 12 after transplantation | areal bone density measurement of the lumbar spine (T score) |
| Biochemical | pretransplantation to 12 after transplantation | Serum levels of osteocalcin |
Outcome results
None listed