Direct Superior Approach Versus PosteroLateral Approach in Total Hip Arthroplasty (SPLAsH)

Pain scoring on a 10-point Likert scale: 0 no pain to 10 worst thinkable pain

general health status, scored on 101-point Likert scale, 0 being worst health to 100 being ideal health

evaluates symptoms and shortcomings in patients with hip complaints 5-point Likert scale, in which a higher score means less symptoms

measures health-related quality of life using 5 domains, questions scored on a 0-100 scale, the higher the score the better the quality of life

measures whether patient has improved or deteriorated over time to determine an effect of an intervention. It asks patients to assess their current health status compared to a previous time-point. 7 numerical values ranging from 7 (very much better) to 1 (very much worse)

measures time it takes for an individual to stand up from an armchair, walk a distance of 3 meters, turn around, walk back and sit down. the quicker the better.

assesses the time it takes to walk 40 meters in patients with hip or knee osteoarthritis

measures the time an individual needs to ascend and descent a stair with 10 steps

Muscular atrophy of the short external rotator muscles will be measured absolutely in cm^3 using the Tumor Tracking Tool of Philip IntelliSpace Portal, version 9.0.

Computer Tomography (CT) image of the pelvis and some slices at the height of the knee condyles. The scans will be reconstructed with a slice thickness of 0.9 of 1 mm and with an additional soft tissue filter. The pre-operative CT scans will be performed with a kilovoltage peak (kVp) of 120. The post-operative scans will be performed at 140 kVp, which helps to mitigate metal artifacts. In addition, the post-operative CT scans will be edited with metal artefact reduction for orthopedic implants (O-MAR; Philips Healthcare). All CT scans will be analyzed on a 23.8-inch Liquid-crystal display (LCD) monitor with a resolution of 1920x1080 pixels.

The initial abduction/inclination of the cup, angle α, is measured on a coronal Computer Tomography (CT) image with respect to the ischial bone, which is used as internal reference. The anterior opening angle of the cup (angle β) is measured on the axial slice at the middle of the head of the prosthesis in which the posterior acetabulum is used as an internal reference. The angle of the neck of the prosthesis relative to the horizontal plane, angle a, is measured in the coronal slice containing the thickest diameter of the neck and is also measured with respect to the ischial bone. The anteversion angle of the neck around the vertical axis, angle b, is measured in the axial slice containing the greatest diameter of the neck with respect to the posterior acetabulum.

The initial abduction/inclination of the cup, angle α, is measured with respect to ischial bone, which is used as internal reference. The anterior opening angle of cup (angle β) is measured on axial slice at the middle of the head of the prosthesis in which the posterior acetabulum is used as internal reference. The angle of the neck of the prosthesis relative to the horizontal plane, angle a, is measured in coronal slice containing the thickest diameter of the neck and is measured with respect to ischial bone. The anteversion angle of the neck around the vertical axis, angle b, is measured in the axial slice Pre-operative hip component planning will be conducted using X-ray and CT images. Regarding component planning, the use of X-ray is sufficient. 3D planning using CT images will be performed retrospectively. Cup position will be compared between the 2D and 3D planning and with the definite positions

The surgeon writes a report of the performed procedure in which the estimated and targeted degrees inclination of the cup and degrees anteversion of the cup and stem are noted. Results will be compared to the component positions as measured on the postoperative CT scan.

The initial abduction/inclination of the cup, angle α, is measured with respect to ischial bone, which is used as internal reference. The anterior opening angle of the cup (angle β) is measured on the axial slice at the middle of the head of the prosthesis in which posterior acetabulum is used as an internal reference. The angle of the neck of the prosthesis relative to the horizontal plane, angle a, is measured in the coronal slice containing the thickest diameter of the neck and is also measured with respect to the ischial bone. The anteversion angle of the neck around the vertical axis, angle b, is measured in the axial slice containing the greatest diameter of the neck with respect to the posterior acetabulum.

Images will be edited by deep-learning metal artifact reduction technique (DL-MAR) and by O-MAR. The post-surgery images with and without O-MAR and the images with DL-MAR will be scored by four radiologists. During this assessment, the radiologist will also have access to the pre-surgery Computer Tomography (CT) scans. The images with and without O-MAR and with DL-MAR will be scored by the radiologists using a five-point scale. The images will be scored on: overall image quality. A five point scale with score 1-5 will be used, including very poor (1), poor (2), fair (3), good (4) and excellent (5).

Images will be edited by deep-learning metal artifact reduction technique (DL-MAR) and by O-MAR. The post-surgery images with and without O-MAR and the images with DL-MAR will be scored by four radiologists. During this assessment, the radiologist will also have access to the pre-surgery Computer Tomography (CT) scans. The images with and without O-MAR and with DL-MAR will be scored by the radiologists using a five-point scale. The images will be scored on: 1) diagnostic confidence for bone, 2) diagnostic confidence for muscle, 3) diagnostic confidence for pelvic organs. a five point scale with score 1-5 will be used, including very poor (1), poor (2), fair (3), good (4) and excellent (5).

Images will be edited by deep-learning metal artifact reduction technique (DL-MAR) and by O-MAR. The post-surgery images with and without O-MAR and the images with DL-MAR will be scored by four radiologists. During this assessment, the radiologist will also have access to the pre-surgery Computer Tomography (CT) scans. The images with and without O-MAR and with DL-MAR will be scored by the radiologists using a five-point scale. The images will be scored on: severity of metal artifacts. a five-point scale including severe (1), pronounced (2), moderate (3), mild (4) and none (5) will be used.

this index consists of two questions about the frequency and the quantity of urinary incontinence (92). The value of each question will be multiplied. A higher score means more severe urinary incontinence.

the UDI-6 consists of six items about the experiences with several symptoms and to what degree the patients bothers (93). A four-point Likert scale is used in the degree part (1 = not at all - 4 = greatly.). Total score is used as outcome. A higher total score means a higher disability.

one question about the severity of the urinary incontinence (94). A four-point Likert scale is used (1 = none - 4 = severe).

the IIQ-7 consists of seven items on the impact of urinary incontinence on activities, participation in daily life, social contacts and emotional status (93). A four-point Likert scale is used (1 = not at all - 4 = greatly.). A higher total score means a bigger impact.

this customized question concerns the opinion of the subject if urinary incontinence is changed after the total hip arthroplasty. This question will only be administered at six weeks and one year postoperatively.participation in daily life, social contacts and emotional status (93). A four-point Likert scale is used (1 = not at all - 4 = greatly.). A higher total score means a bigger impact.