Posterior Ankle Arthroscopy: Endoscopic Treatment for Posterior Ankle Impingement

Quick answer: Posterior Ankle Arthroscopy Endoscopic Posterior Impingement is a common foot/ankle topic that affects many patients. The 2026 evidence-based approach combines proper diagnosis, conservative-first treatment, and escalation only when needed. We treat this regularly at our Howell and Bloomfield Township practices. Call (810) 206-1402.

Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Township, MI. Last updated April 2026.

Table of Contents

The Posterior Ankle arthroscopy Approach

Posterior ankle arthroscopy is a minimally invasive surgical technique that provides access to the posterior ankle joint, subtalar joint, and surrounding structures — including the os trigonum, posterior tibiotalar joint, flexor hallucis longus tendon sheath, and posterior ankle recess — through two small posterolateral and posteromedial portals. The technique was developed to address the limited access of standard anterior ankle arthroscopy to the posterior ankle and to provide a less morbid alternative to open posterior ankle surgery. At Balance Foot & Ankle, we perform posterior ankle arthroscopy for appropriate indications including os trigonum excision, posterior soft tissue impingement, posterior osteochondral lesion access, and flexor hallucis longus pathology.

Posterior Ankle endoscopy Technique

The procedure is performed in a prone position — the patient lying face down — which provides the most direct access to the posterior ankle. Two portals are created adjacent to the Achilles tendon: one directly posteromedial and one posterolateral, each just above the level of the ankle joint. The arthroscope and instruments are introduced with the ankle in a neutral position, and the posterior ankle recess, posterior talus, posterior aspect of the tibiofibular joint, and subtalar joint are systematically examined. The os trigonum, when present, is visualized as a separate bony fragment posterior to the talus and is dissected free from its fibrous attachments and removed in one piece or fragmented. The flexor hallucis longus tendon, which runs in the fibro-osseous tunnel between the medial and lateral process of the posterior talus, is directly visualized and can be released if stenosing tenosynovitis is identified — a condition causing triggering and pain of the big toe tendon behind the ankle that is common in dancers and occurs secondary to os trigonum impingement. Posterior osteochondral defects of the talus accessible from the posterior approach can be microfractured or otherwise treated through the same portals.

Recovery and Outcomes

Posterior ankle arthroscopy is performed as an outpatient procedure. Weight bearing in a boot begins immediately or within a few days depending on the specific procedures performed. Return to low-impact activity occurs at 2 to 4 weeks, and return to sports — including ballet pointe work — typically occurs at 6 to 10 weeks for isolated os trigonum excision without concurrent osteochondral work. The results of posterior ankle arthroscopy for os trigonum syndrome and soft tissue impingement are consistently excellent, with return to pre-symptom activity level reported in 85 to 95 percent of patients across multiple published case series. Complication rates are low when the procedure is performed by surgeons experienced with this specific technique.

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Post-surgery recovery essential: The BraceAbility Short Walking Boot protects the ankle during the initial recovery phase. In our clinic, we typically transition patients from a short boot to supportive shoes within 2 to 4 weeks after posterior ankle arthroscopy.

Frequently Asked Questions

How long is recovery after posterior ankle arthroscopy?

Most patients walk in a protective boot within 3 to 5 days after surgery. Stitches come out at 2 weeks, and a gradual return to activity begins at 4 to 6 weeks. Full return to sports typically takes 6 to 12 weeks depending on the extent of the procedure and the demands of the sport.

Is posterior ankle arthroscopy painful?

The procedure is performed under regional anesthesia, so patients feel no pain during surgery. Post-operative discomfort is typically well-controlled with oral pain medication for the first 3 to 5 days. Most patients report significantly less pain than they expected, and the small incision size contributes to a more comfortable recovery.

What conditions does posterior ankle arthroscopy treat?

Posterior ankle arthroscopy treats os trigonum syndrome, posterior ankle impingement from bone spurs or scar tissue, FHL tendon disorders, loose bodies, and certain osteochondral lesions of the talus. It is particularly valuable for dancers, soccer players, and runners with posterior ankle pain that has not responded to conservative care.

The Bottom Line

Posterior ankle arthroscopy has transformed how we treat posterior ankle impingement and os trigonum syndrome. The minimally invasive approach means faster recovery, less scarring, and a quicker return to the activities you love compared to traditional open surgery.

Posterior Ankle Arthroscopy in Michigan

Endoscopic posterior ankle surgery offers minimally invasive treatment for posterior impingement, os trigonum syndrome, and FHL tendon problems. Our podiatric surgeons perform ankle arthroscopy at our Howell and Bloomfield Township offices.

Learn About Ankle Arthroscopy | Book Your Appointment | Call (810) 206-1402

Clinical References

1. van Dijk CN, et al. A 2-portal endoscopic approach for diagnosis and treatment of posterior ankle pathology. Arthroscopy. 2000;16(8):871-876.
2. Scholten PE, et al. Hindfoot endoscopy for posterior ankle impingement. J Bone Joint Surg Am. 2008;90(12):2665-2672.
3. Ribbans WJ, et al. Endoscopic excision of the os trigonum in professional dancers. Am J Sports Med. 2015;43(6):1398-1403.