Postoperative Imaging of the Ankle: AReview
Society of Skeletal Radiology Annual Meeting, 2020Okezika Kanu MD1, Sameh A. Labib MD2, Adam Singer MD1,Monica Umpierrez MD1, Felix Gonzalez MD1, Philip Wong MD1
1Emory University School of Medicine

Department of Radiology and Imaging Sciences
Division of Musculoskeletal Imaging
2Emory University School of Medicine

Department of Orthopaedics

Correspondence: pwong2@emory.edu

Objectives• To review common procedures performed in the ankle• Be come familiar with the expected postoperative appearance of thevarious procedures• Recognize complications associated with these procedures

Posterior Ankle
PROCEDURES❑ Primary end-to-end
Achilles tendon repair❑ Achilles tendon
lengthening❑ Flexor hallucis longus(FHL) transfer❑ Haglund excision andAchilles tendon
reattachment

Achilles Tendon Repair

ABC

53 year old female with right posterior ankle pain after hearing a pop.

(A): Sagittal PD FS of the ankle demonstrating full thickness midsubstance tear of the Achilles tendon with tendon gap of
approximately 4.0 cm (bracket).
(B and C): Sagittal T1 and PD FS postoperative images 3 years after primary end-to-end repair. There is expected
thickening of the repaired tendon, which is intact. Linear intermediate intrasubstance signal (arrows) within the midsubstance may represent minimal degeneration or postoperative changes. Additionally, there is loss of the calcaneus
declination angle, indicative of possible lengthening of the Achilles.

Achilles Lengthening

AB

C

Achilles tendon lengthening procedures are typically done for patients with congenital or acquired equinus contracture.
Z-lengthening Technique:(A): Illustration demonstrating the Z-lengthening technique. This is an open procedure with longitudinal incision made 2-6 cm
proximal to the insertion. Two incomplete transverse incision are then made on the medial and lateral aspects of the tendon. Thefibers are then distracted for appropriate lengthening with the midline fibers re-anastamosed.
(B and C): Coronal STIR images in a patient who underwent Achilles Z lengthening demonstrating fusiform thickening of the Achilles
tendon with linear areas of hyperintense signal (dashed lines) representing the Z shaped incision of the Achilles tendon. Lateral MRI
may also demonstrate the change of the calcaneus declination angle (see prior slide).

Achilles Lengthening

AB

C

Hoke Lengthening Technique.

(A): Illustration demonstrating the Hoke lengthening technique. 3 percutaneous incisions are created along the medialand lateral aspects of the Achilles tendon in alternating fashion. The initial incision is made approximately 2 cm
proximal to the Achilles tendon insertion.
(B and C): Coronal STIR images demonstrating the Hoke lengthening technique with the alternating defects (arrows).

FHL Tendon TransferAB

CFlexor halluces longus (FHL) tendon transfer may be performed to augment Achilles tendon repairs,
particularly in patients with chronic tendinosis.
Sagittal (A) and axial proton density-weighted fat-saturated (B and C) images shows FHL tendon(arrows) inserting onto the calcaneus directly anterior to the Achilles tendon. The tendon is released
posterior to the talus, approximately 4-5 cm distal to the musculotendinous junction. Tendon transfer
is typically done to strengthen repair in tendons with poor quality.

Haglund excision with Achilles tendon reattachment**AB*C

49 year old female with posterior heel pain.
(A): Lateral radiograph of the left ankle demonstrating posterior calcaneal bump (*) in keeping with Haglund’s
deformity with calcific insertion Achilles tendinosis.
(B and C): Sagittal PD FS postoperative images 3 months after Haglund’s excision with Achilles tendon debridement andre-attachment. There is expected thickening of the Achilles tendon, which is intact and secured by anchor screws
within the calcaneus (double row anchor fixation). Postoperative changes of the calcaneus demonstrates removal ofthe Haglund deformity with mild residual marrow edema (*). Marrow edema is expected at 3 months post-op.

Achilles Rupture s/p Debridement and Haglund Excision

52 year old female with left ankle pain and swelling after falling. Patient was 1 month postop from Haglund’s excision with Achilles tendon debridement and re-attachment.

Sagittal PD FS image demonstrates full thickness tear of the Achilles tendon with retraction(arrow).

Wound Dehiscence s/p Achilles Tendon RepairABC

41 year old male with PMH of diabetes and prior Achilles tendon repair who presents with wounddehiscence.
(A, B and C): Axial T1 FS post contrast, Axial and Sagittal PD FS images of the left ankle showing aperipherally enhancing fluid collection in keeping with abscess overlying and extending into theposterior aspect of the repaired Achilles tendon, which is diffusely thickened.

Medial Ankle (Posterior Tibialis Tendon Insufficiency)

PROCEDURES❑Procedures of the posteromedialcompartment typically involve posterior
tibialis tendon (PTT), which stabilizes thelongitudinal arch of the foot. PTT
insufficiency and spring ligament rupture
can lead to progressive flatfoot
deformity (pes planovalgus).
❑Various surgical techniques for stage II
PTT insufficiency❑ Flexor Digitorum Longus (FDL) to PTT transfer +/❑ Calcaneal Osteotomies +/❑ Medializing calcaneal osteotomy❑ Lateral column lengthening❑ Achilles lengthening (associated equinus) +/❑ Midfoot osteotomy (Cotton)

FDL Transfer to PTT

*

*AB

CD

*

24 year old male with posterior
tibialis dysfunction andacquired pes planus.
(A and B): Axial and Sagittal PD
FS images demonstrating
thickening of the posterior
tibialis tendon withtenosynovitis (arrow) andreactive marrow signal within
the talus and calcaneus (*).
(C and D): Axial and Sagittal PD
FS images demonstrating
expected postoperativechanges after transfer of flexor
digitorum longus to thenavicular (arrows). The native
posterior tibialis tendon wasdebrided and is reinforced by
FDL. Previously seentenosynovitis has resolved.

Calcaneal Osteotomy

A

B

Calcaneal osteotomies are often done to correct hindfoot alignment (cavovarus or planovalgus).
(A and B): Medializing calcaneal osteotomies are commonly performed with FDL transfers to help correct hindfoot valgus deformity and unload the stress on the tendon
transfer. The osteotomy also changes the insertion of the Achilles tendon, turning it into an ankle inverter. An osteotomy is performed posterior to the peroneal tendonsand sural nerve and translated 8-10 mm medially (arrows). Notice an osteotomy done at the medial cuneiform, known as Cotton osteotomy (arrow), which can be done tocorrect forefoot supination.

(C, D, and E): Axial T1 (C), Sagittal T1 (D) and Sagittal CT (E) postoperative images in a patient with FDL to PTT transfer and lateral column lengthening. Lateral columnlengthening restores the arch of the foot and rotates the forefoot and hindfoot medially. This is usually done in addition to FDL transfers in patients who also haveforefoot abduction. An osteotomy is performed 15 mm proximal to the calcaneocuboid joint. The fragments are distracted and bone graft is applied which is secured by alateral plate and screw construct (arrow). The sagittal MR and CT images better demonstrate the lengthened calcaneus.

Lateral Ankle
PROCEDURES❑ Peroneal tendinopathy❑ Peroneal brevis repair and tubularization❑ Peroneal longus transfer❑ Lateral ankle ligament reconstruction❑ Anatomic reconstruction of the ATFL and CFL (Broströmprocedure)❑ Non-Anatomic Repairs (Tendon re-routing)❑ Allograft tendon reconstruction of ATFL and CFL

Peroneal Brevis Repair

AB

C

D

(A and B): 52 year old female with chronic left ankle pain. Axial and Sagittal PD FS images demonstrating longitudinal split tear ofthe peroneus brevis tendon (arrows) with tenosynovitis of the common peroneal tendon sheath.
(C and D): Axial and Sagittal PD FS images shows postoperative changes of peroneal brevis tendon repair and tubularization. The
repaired peroneal brevis (arrow) is now intact with mild intermediate signal, likely due to prior surgery.
Primary repair and tubularization involves debridement of the tendon and suturing the debrided torn edges with thin suture.
Tears involving less than 50% of the tendon area are typically managed with tubularization. Tears involving greater than 50% of
the tendon area may require tenodesis, tendon transfer, or grafting.

Peroneal Longus to Brevis Transfer

23 year old male with previous peroneal longus to brevis tendon transfer.

Sequential oblique axial PD FS images demonstrating peroneus longus (arrow) to brevis
transfer and tubularization, with peroneus longus now coursing in the expected location ofperoneal brevis which was split. The image on the far right demonstrates diminutive
appearance of the unified tendon with surrounding fluid suggesting partial tear of thetendon transfer.

Modified BroströmABC

18 year old female with right anterolateral ankle pain and instability after slipping. Bromström techniqueinvolves primary repair of the lateral ankle ligaments (imbrication). The Modified Bromström technique also
includes advancing the extensor retinaculum to the fibula to reinforce the ligament repair.
(A) Axial PD FS of the right ankle at the level of the anterior talofibular ligament (ATFL) demonstrating thickening
and intermediate signal of the ATFL (arrow) compatible with chronic tear.
(B and C) Axial and Sagittal PD FS images after Modified Bromström demonstrating mild, expected thickening of
the repaired ATFL, which is intact (arrowhead). The overlying extensor retinaculum (arrows) is then advanced tothe anterior edge of the fibula to further augment the repair.

Pseudoaneurysm after Broström Repair

BAC

15 year old female with right ankle pain, swelling, and discoloration after Bromström repair and arthroscopic loose body removal.
(A): Sagittal PD FS image of the right ankle demonstrated an intra-articular hypointense mass (arrow) within the anterior tibiotalar joint.
Notice the pulsation artifact associated with the lesion (arrows).

(B and C): Gray scale and color Doppler imaging of the mass demonstrates internal color Doppler flow with to and fro waveforms and“yin-yang” appearance, compatible with pseudoaneurysm. CTA confirmed pseudoaneurysm of dorsalis pedis artery which wassubsequently surgically repaired.
Reference: Skeletal Radiol. 2019 Mar;48(3):451-455.

Wound Infection s/p Modified Broström

21 year old female with post operative wound infection after undergoing a ModifiedBromström lateral ligamentous reconstruction of her right ankle.

Axial PD FS images of the right ankle demonstrates thickening of the ATFL in keeping withprior repair. Distally, there is a linear hypointense object within the lateral ankle soft
tissues extending to the skin surface with associated susceptibility artifact. Patient wastaken to the OR which revealed an extruded, fractured suture anchor.

Non-Anatomic Repairs

Non-anatomic repairs involve rerouting tendons, typically the peroneal brevis tendon, to augment torn or lax ligaments.
Non-anatomic repairs were introduced as early as the 1930s and popularized in the 1950s with many variations until
Bromström introduced his primary repair technique in 1966.
Evans technique: In this technique shown above, the peroneal brevis tendon is transected distal to the musculocutaneous
junction and re-routed through a distal fibular tunnel. The tendon is then reattached to either its native muscle belly or
the fibular periosteum. In this case, the peroneus brevis was re-attached to the fibula (arrows).

Lee Procedure

Sagittal T1 FS image demonstrating the Lee technique. In this example, the peroneus
brevis is transected distal to the myotendinous junction. The peroneus brevis tendon isthen re-routed through the fibular and looped and sutured distally back upon itself(arrows).

Lee procedure 15 years later

Same patient 15 years lateral with lateral ankle pain demonstrating tear of the re-routed peroneus
brevis tendon as it exits the fibular tunnel anteriorly (arrow).

Watson-Jones Procedure
In this example, the peroneus brevis is resected
proximally, maintaining its distal insertion (arrow). The
tendon is the tunneled through the lateral malleolus fromposterior to anterior to the lateral talus, simulating theATFL (arrows). The tendon is then passed through atunnel within the talus superiorly (arrow) and pulled
backwards, back to the fibula (arrowheads).

Talus Osteochondral Lesion
PROCEDURES❑ Microfracture/Drilling❑ Osteochondral Allograft/Autograft Transplantation

Microfracture/drilling*ABC

16 year old with right talar dome osteochondral lesion (OCL) treated with drilling.
(A): Sagittal PD FS image demonstrates a crescentic osteochondral fragment with underlying marrow
edema. Patient was subsequently treated with drilling of the OCL down to the base of the talus tostimulate marrow and chondrocyte repair.
(B and C): Sagittal T1 FS and PD FS images after arthrogram demonstrating interval decrease in talardome marrow edema with linear areas of residual marrow edema extending into the talus, likely
related to the drilling technique (*). Notice the T1 hypointense signal at the cartilage interface
demonstrating fibrocartilage development (arrow).

OCD Allograft- Biocartilage Augmentation*ABC

17 year old with right talar dome OCL treated with removal of the OCL, curettage and microfracture of
the base followed by allograft repair(A, B, and C): Sagittal PD FS images demonstrating the area of prior OCD with flattening of thesubchondral bone plate (*). Overlying intermediate signal similar to the adjacent native cartilage,
likely representing the allograft is seen filling the defect (arrow). There is mild underlying edema-likesignal (arrow), which can be seen in the post operative setting. Reactive marrow signal can last for up
to 12 months after the procedure.

Curettage with microfracture andsubsequent recurrenceAB
09/2013C
05/201408/2016(A): 57 year old who underwent curettage with microfracture of a medial talar dome osteochondral lesion (arrow).
(B): MRI approximately 6 months after curettage and microfracture showing interval filling of the defect (arrow) withintermediate marrow signal as well as overlying cartilage development (arrow).
(C): MRI almost 3 years after the initial surgery demonstrating development of adjacent subchondral cystic
formation concerning for recurrence (arrows).

OCD Autograft Failure

A

B

C

13 year old with history of prior tibiofibular syndesmosis ORIF, osteochondritis dessicans (OCD) repair
with autograft repair and retrograde drilling who presented with continued ankle pain.

(A and B): Sagittal PD FS and Sagittal CT images of the right ankle demonstrating an unstable medial
talar dome OCD (arrows) with fluid undercutting the osteochondral fragment in keeping with failure.
(C): Rounded area of PD FS hyperintense signal in the central aspect of the talus favored to represent
presumed drill track (arrow).

Conclusion❑The wide variety of procedures performed in the ankle can be challenging for the interpreting
radiologist❑Familiarity with the common procedures performed in the ankle is helpful for recognizing true
pathology as opposed to expected postoperative changes❑Radiologists should be aware of complications such as re-tear, infection, graft or tendon
transfer failure, and vascular injury.

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Thank you!