Digital Sizing for Orthopaedic Hip Implants

Photo-manipulation of Digital Radiographs and Digitized Templates as a Method for Preoperative Sizing of Total Hip Arthroplasties

Hip implants come in different sizes. Currently, surgeons predict the implant size that will be needed using an analogue method whereby photos of the implant sizes are overlaid on the x-rays. In this study, we propose to use a digital, computerized method of templating which we expect will be more accurate than the overlay method.

Inclusion Criteria:

• Patients booked for primary total hip arthroplasty with non-cemented prosthesis.
• No previous surgery/fractures to acetabulum or femur or hip.
• No gross bony abnormality except for osteoarthritis and avascular necrosis.

Exclusion Criteria:

• Cancer or tumor suspected, morbid obesity, revision, previous acetabular/femur/hip surgery, gross bony deformity, calibration bar not completely pictured on radiograph, unsuccessful surgery fracture/cancer/cemented prosthesis used.