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Knee X-ray Radiology

Categories
  • Education
  • Knee
  • Knee Radiology
  • Medical
Tags
  • Radiology
  • Shoulder Radiology
Radiology

Knee Xray Radiology

Normal bone anatomy of right knee

Anterior view of right knee

Anterior view of right knee

Medial view of right knee

Medial view of right knee

Posterior view of right knee

Posterior view of right knee

Mechanical axis

Mechanical axis
Mechanical axis

Mechanical axis of lower limb

Mechanical axis of lower limb
Mechanical axis of lower limb

X-ray Knee

Anteroposterior view: Supine position with fully extended knee and central X-ray beam directed vertically at a 5-7° cephalad angulation.

Notch (tunnel) view: Prone position with 40° knee flexion and the Xray beam is directed caudally toward the knee at a 40° angle from the vertical.

Weight-bearing AP view is preferable.

Standing flexion views at 30°-40° allows assessment of articular wear in deeper flexion that is may not be apparent on standard AP views in early degenerative knee arthritis.

Right Knee
Anterior view of right knee

Anterior view of right knee

AP Xray view of right knee

AP Xray view of right knee

Xray Right Knee

Anterior view of right knee

Anterior view of right knee

Posterior view of right knee

Anterior view of right knee

Standing AP Xray view

AP Xray view of right knee

Standing flexion views

Standing weight-bearing flexion

Standing weight bearing flexion

Medial joint space narrowing with lateral joint space preservation.

Standing weight bearing flexion

Weight-bearing views

Standing AP

Standing AP

Medial joint space narrowing with preservation of lateral compartment.

Standing Lateral

Standing Lateral

Assess tibia wear pattern and determine tibia slope

Stress radiologic views

Valgus stress

Valgus stress applied. Lateral joint space preservation.
Intact MCL (medial collateral ligament).

Varus stress

Varus stress applied demonstrating medial joint space narrowing. Intact LCL (lateral collateral ligament).

Lateral view: Lateral position with 30° knee flexion. The Xray beam is directed medially at 5°-7° cephalad angulation.

Lateral view of the knee

Lateral view of knee
Lateral view of knee
Lateral view of knee

Radiological Patellar views

  • Standing anterior-posterior (AP) and lateral views
  • Merchant view of patella
  • CT in select cases (assess TT-TG)

Patellar position

  1. Sunrise view: Prone position with knee flexed to 115° the beam is directed at a 15° cephalad angulation toward patella.
  2. Merchant view: Supine position with 45° knee flexion the beam is directed at a 60° caudal angle through patella.
Patellar position

Normal Femur Trochlear

Normal Femur Trochlear

Normal Femur Trochlear

Patellar position using CT scan

Axial CT view of the right knee

α Tibial tubercle-to-trochlear groove (TT-TG) distance.

Superimposed images used to calculate

TT-TG.

Patellar height

Patellar height

Insall-Salvati ratio

A/B: normal = 1 ± 0,2

Modified Insall-Salvati ratio

Modified Insall-Salvati ratio

A/B High patella >2.0

Blackburn-Peel index

Blackburn-Peel index

A/B: normal =0.8-1

Caton Deschamps index

Caton Deschamps index

A/B: normal mean = 1 (0,6-1,3)

Patellar Trochlear Dysplasia
X-ray assessment

Patellar Trochlear Dysplasia_X-ray assessment

Normal Femur Trochlear

Normal Femur Trochlea
Normal Femur Trochlear

Femur trochlear dysplasia

Femur trochlear dysplasia
Femur trochlear dysplasia
Femur trochlear dysplasia
Femur trochlear dysplasia

References

1. Unicompartmental knee replacement. Bert J M. Orthop Clin North Am 2005; 36:513-522.

2. Unicompartment Knee arthroplasty. Borus T, Thornhill T. J Am Acad Orthop Surg 2007; 15: 9-18.

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