The relationship between component position and RoM
Research type
Research Study
Full title
An investigation of the relationship between total hip implant position and hip range of movement
IRAS ID
201300
Contact name
Alistair M Ewen
Contact email
Sponsor organisation
Golden Jubilee Foundation
Clinicaltrials.gov Identifier
Duration of Study in the UK
1 years, 4 months, 1 days
Research summary
This is a prospective single group study of total hip arthroplasty (THA) patients. We aim to measure the range of motion (RoM) and the position of the components to determine how, and to what degree, the component position affects the RoM of the hip joint and to investigate the accuracy of a computational method of assessing hip joint RoM.
Ninety suitable patients will be recruited and will have the Excia T stem and Plasmafit cup implanted as per the consultant’s standard practice. They will have their standard inpatient care and follow-up reviews, however, at the three month post-operative follow-up; study patients will have a computed tomography (CT) scan of the full pelvis. This will be performed instead of, not as well as, the anterior/posterior full pelvis and lateral hip radiographs which are standard practice.
Three measures of hip joint RoM will be collected; the actual, the theoretical and the navigation RoMs. Study patients will have their actual hip RoM measured three months post-operatively using clinical movement analysis. Measurements taken from the CT scan will be used to compute the theoretical RoM of the hip joint. The navigated RoM is measured by the computer the surgeon uses to aid the surgery. CT scans will be used to determine the orientation of the components and from this the combined anteversion (CA) will be determined. Data from the RoM measurement session will be analysed together with the component orientations and CA to investigate any connection between them and the RoM. The actual measured RoM will also be compared to the theoretical and navigate RoMs.
In addition to standard follow-up questionnaires (Oxford Hip Score, EQ-5D and satisfaction), study patients will also complete the Harris Hip Score. These standard and study questionnaires will be used to determine the overall success of the THA.REC name
South East Scotland REC 02
REC reference
16/SS/0205
Date of REC Opinion
25 Nov 2016
REC opinion
Favourable Opinion