Table 2.

Recommended field of view as published in the orthopaedic companies’ CT protocol document.

Orthopaedic company	Scan length
AQ Solutions	Proximal – ‘iliac crest to mid-femur’; knee – ‘Both condyles as rotational measurement of the femurs’; ankles – ‘Both ankles as rotational measurement of the tibiae in frontal plane’
Conformis	~38–45 cm (include full pelvis); ‘Top of iliac crest to mid knee joint’
HipXpert	‘Include the whole pelvis and the upper part of the femurs (approximately 20 cm below the tip of the greater trochanters)’; Femoral condyles: ‘50 mm of the left and right distal femurs’
Implantcast	‘Start: Above anterior superior ilia spine (ASIS); Stop: 200–375 mm below centre of trochanter major, depending on required stem length. Scan two femoral condyle slices’
JRI	‘>50 mm inferior of lesser trochanter up to superior origin of sacroiliac joints’
Lima Corp.	38–44 cm depending on patient size. ‘Start: Top of Iliac crest; Stop: Mid-femur or at least 3 cm below existing femoral implant. Perform two femoral condyle slices’
Materialise	<40 cm ‘Include complete bony pelvis: from the most superior point of the ilium to the most inferior point of the ischium’
Medacta	Whole pelvis and proximal femur (up to 60 cm). ‘Scan must start at least 2 cm above the iliac crests and continue to at least 10 cm below the lesser trochanter.’ Distal part of the femur in the affected side
OSSIS	‘Captures all bone and soft tissue of the entire pelvis (from above iliac crests to below ischial tuberosity)’
Smith & Nephew	500 mm. Bilateral pelvis. ‘Start: Midpoint between the anterior inferior iliac spine (AIIS) and anterior superior iliac spine (ASIS). End: 30 mm below lesser trochanter’
Stryker	Region 1 = pelvis + proximal femur. ‘The entire bilateral pelvis and at least 180mm below the lesser trochanter on the femur.’ Region 2 = bilateral knee-joint lines between femur and tibia and 10 cm proximal to joint line on femur
Symbios	500 mm. ‘Pelvis series: Include the iliac crests as well as the distal femoral isthmus Knees series: Include the entire distal femoral epiphysis’
Zimmer Biomet	‘38–44 cm depending on patient size. Needs to include full pelvis. Start: Top of Iliac crest. Stop: Mid-femur or below existing femoral.’ Perform two femoral condyle slices (to show anteversion)
MediCAD	‘CT scan in one pass through the entire pelvis and both knees.’ Pelvis: top of the iliac crest to 20 cm distally to the centre of the femoral head.
Signature Orthopaedics	‘All bony regions of complete pelvis: from just above the most superior point of the ilium down to just below the most inferior point at the ischium’
Adler	Not specified*
LEXI Co., Ltd.	‘THA: entire pelvis and femur’

^*Information left to the discretion of the imaging centre.