Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatrist, Fellow of the American College of Foot and Ankle Surgeons. Updated April 2026.
When Ankle Sprains Lead to Chronic Instability
Approximately 40% of ankle sprains do not fully resolve with conservative treatment—instead developing into chronic lateral ankle instability (CLAI). Patients with CLAI experience recurrent “giving way” episodes, persistent ankle weakness, reduced athletic performance, and pain with activity. The instability results from incompletely healed or functionally deficient lateral ankle ligaments—primarily the anterior talofibular ligament (ATFL) and calcaneofibular ligament (CFL)—that fail to adequately restrain the ankle during daily activities and sport.
Initial treatment of CLAI is conservative: 3–6 months of focused physical therapy for peroneal muscle strengthening (the primary dynamic stabilizers of the lateral ankle), proprioceptive retraining, and functional bracing. Functional bracing and physical therapy prevent recurrent sprains in many patients. When these measures fail and patients continue to have functionally limiting instability—particularly athletes, or patients with objective talar tilt on stress X-rays or documented ligament tears on MRI—surgical reconstruction is considered.
The Modified Brostrom Procedure
The Modified Brostrom-Gould procedure is the gold-standard surgical treatment for CLAI. The procedure involves shortening and tightening the stretched ATFL and CFL by imbrication (overlapping and suturing) of the ligament tissue back to the fibula, restoring anatomical length and tension. The Gould modification incorporates the inferior extensor retinaculum (a band of fibrous tissue on the front of the ankle) into the repair, providing additional reinforcement. This anatomic repair preserves the natural anatomy rather than replacing the ligament with graft tissue, which is the primary advantage over non-anatomic procedures.
Arthroscopic-assisted Brostrom techniques have become increasingly popular, reducing soft tissue disruption and allowing simultaneous treatment of intra-articular pathology (chondral lesions, loose bodies, synovitis) that is present in up to 70% of patients with chronic instability. Outcomes for the Modified Brostrom are excellent—90–95% of patients report good to excellent results with restoration of stability and return to sport.
Recovery Timeline
Recovery from Modified Brostrom proceeds in predictable phases. The first 2 weeks involve non-weight-bearing in a cast or splint to protect the repair. At 2 weeks, transition to a walking boot with progressive weight-bearing begins. Return to regular shoes occurs at 4–6 weeks. Physical therapy starts with range-of-motion and progresses to strengthening and proprioception. Return to running is typically at 3–4 months; return to cutting sports, pivoting, and competitive athletics at 5–6 months. Full recovery—including trust in the ankle during sport—may take up to 9–12 months psychologically even when physical healing is complete.
Frequently Asked Questions
How do I know if I need ankle ligament surgery?
Surgery is appropriate when: chronic lateral ankle instability (recurrent giving way, inability to return to sport) has persisted despite at least 3–6 months of dedicated conservative treatment including physical therapy and bracing; the instability is functionally limiting your activities or career; stress X-rays show objective talar tilt confirming mechanical instability; or MRI confirms significant ligament pathology. Age is not a contraindication—both younger athletes and active older patients can benefit from reconstruction. Patients with hyperlaxity syndromes (Ehlers-Danlos, generalized joint laxity) may have less predictable outcomes and may require augmented reconstruction or allograft. The decision for surgery should be made collaboratively after a thorough trial of conservative care has failed to restore adequate function.
Will I need physical therapy after ankle ligament surgery?
Yes—physical therapy is an essential component of Brostrom recovery and cannot be skipped. The surgery restores anatomic ligament tension, but strength, proprioception, and neuromuscular control must be rebuilt through structured rehabilitation. The primary causes of residual instability or re-injury after Brostrom are inadequate rehabilitation and premature return to sport before strength and proprioception are restored. Physical therapy begins with range-of-motion exercises, progresses to peroneal strengthening, balance and proprioception training, and culminates in sport-specific functional progressions before return to athletics. Most patients benefit from 4–6 months of formal physical therapy following reconstruction.
What is the success rate of the Brostrom procedure?
The Modified Brostrom-Gould procedure has excellent outcomes—approximately 90–95% of patients report good to excellent results at short-to-medium term follow-up. Return to sport at the pre-injury level occurs in 85–90% of athletes. Long-term studies (10–20 year follow-up) show maintained stability in 80–85% of patients. The procedure provides better restoration of natural anatomy and motion compared to non-anatomic tenodesis procedures. Risk factors for suboptimal outcomes include generalized ligamentous laxity, very large pre-operative talar tilt (suggesting severe ligament damage requiring augmentation), and revision surgery. Failure requiring re-operation occurs in approximately 5–10% of cases and may be addressed with revision Brostrom or augmentation with peroneal tendon graft.
Medical References & Sources
- American Orthopaedic Foot & Ankle Society — Chronic Ankle Instability
- PubMed Research — Brostrom Procedure Outcomes
- PubMed Research — Arthroscopic Brostrom Outcomes
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Dr. Tom Biernacki, DPM is a board-certified podiatric surgeon at Balance Foot & Ankle in Howell and Bloomfield Hills, Michigan. He performs ankle ligament reconstruction including the Modified Brostrom-Gould procedure for chronic lateral ankle instability, with arthroscopic evaluation of intra-articular pathology.
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Medically Reviewed by: Dr. Tom Biernacki, DPM — Board-Certified Podiatrist, Balance Foot & Ankle Specialists
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Clinical References
- Maffulli N, et al. The Modified Brostrom Procedure for Chronic Lateral Ankle Instability: A Systematic Review. Foot Ankle Surg. 2017;23(3):143-151.
- Vuurberg G, et al. Diagnosis, Treatment and Prevention of Ankle Sprains: Update of an Evidence-Based Clinical Guideline. Br J Sports Med. 2018;52(15):956.
- Bell SJ, et al. The Modified Brostrom Procedure: The Effectiveness of a Method of Repair. Foot Ankle Int. 2006;27(10):821-826.
Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.