Inflammatory Arthritis, Osteoarthritis, Hip
Conditions
Keywords
Hip, Resurfacing, Ceramic
Brief summary
The goal of this randomised controlled trial is to compare the success of two types of hip replacement in patients with hip arthritis. The main question it aims to answer is whether a new type of hip replacement (called a hip resurfacing) can be as successful as an existing hip replacement (called a total hip replacement). Patients will be given either the new hip resurfacing or the existing total hip replacement and researchers will compare their function, complication rate and physical activity.
Detailed description
The H1 Implant is a cementless, ceramic hip resurfacing arthroplasty (HRA) device. The intended purpose of the H1 Implant is to provide an artificial substitute for a disease-damaged hip joint to replace the articulating surfaces of the hip while preserving the underlying femoral head and natural femoral neck. This is standard for a resurfacing hip prosthesis. This study will randomise patients to receive either The H1 Implant or a primary cementless ceramic-on-poly or ceramic-on-ceramic total hip replacement (THR). Composite clinical success (CCS) scores, physical activity levels and patient reported outcome measures (PROMs) will be compared for the two groups. The primary objective of the study is to determine whether the H1 Implant is non-inferior to cementless THR in terms of CCS. The key secondary objective is to determine whether the H1 Implant is superior compared to cementless THR in terms of physical activity and PROMs. Other secondary objectives are to compare the H1 Implant and THR with respect to: safety, through collection of all device-related, operative site-related and systemic adverse events; and noise generation, through patient survey.
Interventions
DEVICEThe H1 Implant
Patients allocated to The H1 Implant arm will be implanted with the H1 Implant which is a cementless, ceramic hip resurfacing device.
DEVICECementless total hip replacement
Patients allocated to cementless total hip replacement arm will be implanted with a cementless ceramic-on-poly or ceramic-on-ceramic total hip replacement
Sponsors
Embody Orthopaedic Limited
Imperial College London
National Institute for Health Research, United Kingdom
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)
Masking description
The patients, clinical assessors and data analysts will be blinded to the intervention each patient has received for the 24 month post-operative period. The surgeon, operating theatre team, radiographic analysts and CRO cannot be blinded but will not be involved in the care of the patient after the intervention unless the patient requires revision surgery.
Intervention model description
Randomisation will be performed using variable block randomisation with block sizes of 4, 6 and 8, with a 1:1 allocation to the 2 groups, with stratification across sites. This will ensure approximately equal numbers across groups and approximately the same number per group at each site (to control for differences in the trial population because of environmental, social and demographic factors), while allowing different total numbers at each site. It will also ensure that at any given time, the numbers in each group will be approximately equal, allowing the interim analyses to take place. The randomisation will be managed by the contract research organisation (CRO) via an electronic data capture (EDC) system, which uses a validated randomisation algorithm. Once a patient has been consented, they will be assigned to a treatment group according to the pre-determined order inside the block. Stratification by site is recommended for multi-centre studies.
Eligibility
Sex/Gender
ALL
Healthy volunteers
No
Inclusion criteria
* Patient requires unilateral primary hip arthroplasty due to primary osteoarthritis, osteoarthritis secondary to e.g. trauma, avascular necrosis or developmental hip dysplasia, or inflammatory arthritis. * Patient is willing to comply with study requirements. * Patient plans to be available through 10 years postoperative follow-up.
Exclusion criteria
* Patient has a BMI greater than 40 kg/m². * Patient has active infection or sepsis (treated or untreated). * Patient has insufficient bone stock at the hip (\>1/3 necrosis of the femoral head or large and multiple cysts) or in general as in severe osteopenia or osteoporosis (t-score \< -2.5 as measured with BMD). * Patient is not skeletally mature. * Patient meets the contraindication criteria of the control device. * Patient already has another lower limb arthroplasty or arthrodesis or will require a further lower limb arthroplasty or arthrodesis within the subsequent 2 years. * Patient lacks capacity to consent. * Patient is unable to understand the native language of the country where their procedure is taking place
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Composite clinical success (CCS) | 24 months post-operatively | The primary outcome is "composite clinical success". This is a binary outcome measure. Patients are deemed to have achieved CCS if they meet all of the following criteria at the 24 month timepoint: * Modified Harris Hip Score ≥80. * No revision or pending revision. * Acetabular radiolucencies: not in all zones. * Femoral radiolucencies: not in all zones. * Absence of subsidence/migration of the acetabular or femoral component \>5mm with clinical findings. * Absence of specific adverse device effects (ADEs) that are pre-cursors to revision of the device, namely: * Bone breakage around the implanted component(s) (periprosthetic fracture). * Breakage of the device component. * Device movement/migration of clinical consequence as defined by associated clinical findings as: a limp; leg length discrepancy; and restricted range of motion. * Dislocation of the hip joint. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Physical Activity | 6 months, 12 months and 24 months post-operatively | Average daily minutes of activity and mean bouted daily moderate-vigorous physical activity (MVPA), minutes |
| Noise | 6 weeks, 6 months, 12 months and 24 months post-operatively | Noise questionnaire |
Countries
United Kingdom
Contacts
CONTACTCamilla Halewood, PhD
CONTACTSusannah Clarke, PhD
PRINCIPAL_INVESTIGATORJustin Cobb, Prof
Imperial College London
Outcome results
None listed