Radiographic technique of Ankle, Toes, foot and Calcaneus

7th presentation

BASIC SPECIAL

AP AnkleAP Ankle Mortise

Lateral Ankle APO Ankle 45

Toes :AP Lateral Toes Toes : APO

AP foot APO foot

lateral foot

AP and Lat both feet (Weight-bearing technique)

Axial CalcaneusMediolateral Calcaneus

projections

AP Ankle. Basic

Film Size: HD 24x30 cm, )10x12in (crosswise.SHIELDING: Place lead shield over patient’s lap.Patient Position: Patient supine place pillow under head.Part Position: legs fully extended, foot in the natural position, foot and ankle in true AP. Distance: 100 cm or 40 in. C P: Midway between malleoli.CR : perpendicular to the film.

Collimation: collimate on four sides to area of interest.

1. Fibula2. Tibia3. Distal Tibiofibular joint4. Malleolar fossa

AP Ankle

5. Lateral malleolus 6. Ankle join

7. Medial malleolus 8. Talus

Structure shown:

distal third of tibia-fibula, the lateral and medial malleoi, and the talus and the proximal half of the metatarsals should be demonstrated.

AP Ankle Mortise (15º– 20º medial rotation) Basic

Film Size: HD 24x30 cm, )10x12in ( crosswise.SHIELDING: Place lead shield over patient’s lap.Patient Position: Patient supine place pillow under head.Part Position: legs fully extended, foot in the natural position )in natural extended position(, leg and foot then medially rotated 15 to 20 until the intermalleolar line is parallel to the film. Distance: 100 cm or 40 in. C P : A point midway between malleoli.CR :perpendicular to the film.

Collimation: collimate on four sides to area of interest

Structure shown:

distal one third of tibia and fibula, the lateral and medial malleoi, the talus, and the proximal half of the metatarsals should be demonstrated. The entire ankle mortise should be open and well visualized.

Lateral Ankle (Mediolateral) Basic

Film Size: HD 24x30 cm, )10x12in (crosswise. SHIELDING: Place lead shield over patient’s lap.Patient Position: Patient in lateral recumbent give pillow for head.Part Position: the affected side down, knee of affected limb flexed 45, sound leg behind the affected leg, foot and leg in a true lateral, sole approximately 90 to film. Distance: 100 cm or 40 in.C P : Medial malleolus.

CR :perpendicular to the film.

Collimation: collimate on four sides to area of interest.

Structure shown:

The distal one third of tibia and fibula, with the distal fibula superimposed by the distal tibia, the talus and calcaneus will appear in lateral profile.

The tuberosity of the fifth metatarsal, the navicular,and cuboid will also be visualized.

fifth metatarsal

APO Ankle 45 (medial rotation) Basic

Film Size: HD 24x30 cm, )10x12in (crosswise.SHIELDING: Place lead shield over patient’s lap.Patient Position: Patient supine give pillow for head.Part Position: legs fully extended, foot dorsiflexed so that planter surface is )80 to 85( from the film, leg and foot rotated internally 45)similar position to ankle mortise(. Distance: 100 cm or 40 in. CR : perpendicular to the film.C P: A point midway between malleoli.

Collimation: Collimate on four sides to area of interest.

Structure shown:

distal one third of the lower leg, the malleoi,

the talus, and the proximal half of the metatarsals should be seen.

Toes :AP . Basic

Film Size: HD 18x24 cm )8x10in ( crosswise.SHIELDING: Place lead shield over patient’s lap.Patient Position: Patient supine or seated.Part Position: knee flexed, planter surface of the foot )sole( on film. Distance: 100 cm or 40 in. CP : metatarsophalangeal joints MTPJ)s( in question.

C R:10-15 toward the Calcaneus )the heel( or)perpendicular to the

phalanges(.Collimation: collimate on four sides to area of interest.

NB/ If a 15 wedge is used, CR must be perpendicular to the film.

Structure shown:

digits of interest and a minimum of the distal half of

metarsals should be included.

Lateral Toes : Basic

Film Size: HD 18x24 cm )8x10in ( crosswise.SHIELDING: Place lead shield over patient’s lap.Patient Position: Patient supine or seated.Part Position: knee flexed, affected leg and foot both rotated medially )Lateromedial( for 1st, 2nd, and 3rd, and laterally )for 4th and 5th( a cotton tape to separate and flex other toes to prevent superimposition. Distance: 100 cm or 40 in. C R: Perpendicular to film. CP: Interphalangeal joint IPJ (for 1st digit ), Proximal Interphalangeal joint (PIPJ) (2nd to 5th). Collimation: collimate on four sides to area of interest. Structure shown:

phalanges of digits in question should be seen in lateral position free of superimposition by other digits.

Toes : APO Basic

Film Size: HD 18x24 cm )8x10in ( crosswise.SHIELDING: Place lead shield over patient’s lap.Patient Position: Patient supine or seated.Part Position: knee flexed, planter surface on the film, affected leg and foot both rotated 30 to 45 medially )Lateromedial( for 1st, 2nd, and 3rd, and laterally )for 4th and 5th(.Distance: 100 cm or 40 in. CR: Perpendicular to film C P: metatarsophalangeal joints. MPJ)s( in question are centered to CR. Collimation: collimate on four sides to area of interest.

Structure shown: digits in question and distal half of metarsals should be included without overlap )superimposition( .

AP foot (Dorsiplanter) Basic

Film Size: HD 30x24 cm )10x12(in lengthwise . SHIELDING: Place lead shield over patient’s lap.Patient Position: Patient supine give pillow for head. Part Position : the knee flexed, planter surface on film, sandbags used to immobilize the film, opposite knee flexed and rests against affected knee for support. or extended.

Distance: 100 cm or 40 in.

CR: 10 toward the heel.

C P: Base of 3rd metatarsal. Collimation: Collimate on four sides to area of interest. NB/ Perpendicular )0( for a F.B. and for a flat foot or a low arch foot nearer 5, and 15 for a high arch foot.

Structure shown: entire foot should be demonstrated including all phalanges and

metarsals and the 1- Navicular, 2- Cuneiforms, and 3- Cuboids.

APO foot : Basic

Film Size: HD 30x24 cm )10x12(in lengthwise.SHIELDING: Place lead shield over patient’s lap.Patient Position: Patient supine or seated.Part Position: knee flexed, planter surface on film, foot rotated medially so that the sole is 30 to 40 to film. A 45radiolucent wedge can be used to support the foot and prevent motion ,sandbags used to immobilize the film if necessary, turn body slightly away from side in question. Distance: 100 cm or 40 in. CR: perpendicular to the film.C P:Base of 3rd metatarsal. Collimation: collimate on four sides to area of interest.

A-E: Toes  1-5. )A:Great toe(1,3: Distal phalanx4: Middle phalanx2,5: Proximal phalanx6. Interphalangeal joints7. Metatarsophalangeal joints8. Sesamoid9. Head of metatarsal10. Shaft )body( of metatarsal11. Base of metatarsal12. Cuneiforms13. Navicular14. Cuboid15. Talus16. Calcaneus17. Tibia18. Fibula19. Tarsometatarsal joints20. Transverse midtarsal joint

Structure shown: Entire foot should be demonstrated from distal phalanges to posterior calcaneus. And proximal talus.

lateral foot: Basic

Film Size: HD 24x30 cm )10x12in ( lengthwise. large footFilm Size: HD 18x24 cm )8x10in ( lengthwise.SHIELDING: Place lead shield over patient’s lap.Patient Position: Patient in lateral recumbent, pillow under head.Part Position: knee flexed 45, opposite leg behind injured leg, foot carefully dorsiflexed for a true lateral position, support under leg and knee, sole of foot 90 to film. Distance: 100 cm or 40 in. CR: perpendicular to the film. C P: Medial cuneiform )level of the base of the 3rd metatarsal(. Collimation: collimate on four sides to area of interest.

Alternate lateromedialmediolateral

A. Tibia.B. Calcaneus.C. Calcaneus tuberosity.D. Cuboid.E. 5th MT tuberosity.F. Superimposed cuneiforms.G. Navicular.H. Subtalar joint.I. Talus.

RADIOGRAPHIC ANATOMY

Lateral foot

Structure shown: entire foot should be demonstrated and minimum of 1 in or 2.5cm of distal tibia-fibula .metarsals will be nearly )superimposition( with only the tuberosity of the fifth . metarsals seen in profile.

AP and Lat both feet )Weight-bearing technique (: S

Film Size HD 24x30 cm )10x12in ( lengthwise )large foot for laterals(.SHIELDING: Place lead shield over patient’s lap.•Patient Position : AP: Patient standing erect, full weight evenly distributed on both feet )on the fluoroscopic foot-rest(.Lat : Patient stand erect on wood blocks on the foot rest, film vertically between feet, cassettes changed for lateral of the other foot for comparison. Distance: 100 cm or 40 in. Collimation: collimate on four sides to area of interest. CP: (AP): CR: 15 to midpoint between the both feet, at the level. of the base of metatarsals.)Perpendicular is preferred for flat foot(.

(Lat) : CR Horizontally to the level of base of the 3rd metatarsals.

CP

CP

Structure shown: for AP, projection shows bilateral feet from soft tissue surrounding phalangeasTo distal portion of talus. For lateral entire foot should be demonstrated and a minimum of 1 in or 2 cm of distal tibia-fibula ...

Axial Calcaneus (Heel bone). Basic

Film Size HD: 18x24 cm ) 8x10 in(crosswise .SHIELDING: Place lead shield over patient’s lap.Patient Position: Patient supine or seated.Part Position : legs fully extended, foot dorsiflexed )sole 90 to film(, using a cotton ribbon or gauze looped around foot pulled by patient for support. Distance: 100 cm or 40 in. CR: 40 cephalic from long axis of foot. CP: Base of 3rd metatarsal.

Collimation: collimate on four sides to area of interest.

talocalcaneus joint

Axial Calcaneus (Heel bone)

Structure shown: entire Calcaneus should be visualized from the tuberosity posteriorly to the talocalcaneus joint anteriorly

Mediolateral Calcaneus. Basic

Film Size HD 18x24 cm ) 8x10 in(crosswise .SHIELDING: Place lead shield over patient’s lap. Patient Position: Patient lateral recumbent.Part Position : with affected knee flexed 45,opposite leg behind injured limb, support under knee and leg, sole 90 to the film, ankle and foot in the true lateral. Distance: 100 cm or 40 in. CP: 1 inch inferior to medial malleolus.CR: perpendicular to the film.

Collimation: collimate on four sides to area of interest.

Structure shown: Calcaneus in profile with the talus and distal tibia-fibula demonstrated superiorly, and the navicular and the open joint space of the Calcaneus and Cuboid demonstrated Distally.

Calcaneucuboid joint