Introduction to the Modified Broström-Gould Procedure

Chronic lateral ankle instability (CLAI) is a debilitating condition characterized by recurrent sprains, persistent pain, and a subjective feeling of "giving way." When conservative management—comprising aggressive physical therapy, peroneal strengthening, and bracing—fails, surgical intervention is indicated.

The original Broström procedure, described in 1966, revolutionized the treatment of CLAI by advocating for a direct anatomical repair of the ruptured anterior talofibular ligament (ATFL) and calcaneofibular ligament (CFL), moving away from non-anatomical tenodesis procedures (e.g., Watson-Jones, Evans, Chrisman-Snook) that sacrificed normal peroneal tendon kinematics. In 1980, Gould et al. introduced a critical modification: the mobilization and advancement of the lateral extensor retinaculum to the distal fibula. This "Gould Modification" reinforces the repaired ligaments, limits pathological inversion, and crucially addresses concurrent subtalar instability. Today, the Modified Broström-Gould procedure remains the gold standard for the surgical management of chronic lateral ankle instability.

Surgical Anatomy and Biomechanics

A profound understanding of the lateral ankle ligamentous complex is mandatory for a successful anatomical repair.

• Anterior Talofibular Ligament (ATFL): The ATFL is a thickening of the anterior joint capsule. It originates from the anterior margin of the lateral malleolus and inserts on the talar body. It is the primary restraint to ankle inversion when the foot is in plantar flexion. Because it is confluent with the capsule, it is the most frequently injured ligament in inversion sprains.
• Calcaneofibular Ligament (CFL): The CFL is an extra-articular, cord-like structure originating from the tip of the lateral malleolus and inserting on the lateral calcaneal tubercle. It runs deep to the peroneal tendons and their sheath. The CFL is the primary restraint to inversion when the ankle is in dorsiflexion and spans both the tibiotalar and subtalar joints, making its repair critical for subtalar stability.
• Posterior Talofibular Ligament (PTFL): The strongest of the lateral ligaments, the PTFL is rarely torn except in severe ankle dislocations. It is not routinely addressed in a standard Broström repair.
• Lateral Extensor Retinaculum (LER): A Y-shaped band of deep fascia over the anterior ankle. The stem of the "Y" attaches laterally to the calcaneus. In the Gould modification, this structure is advanced to the fibula to act as a secondary restraint to inversion.

💡 Clinical Pearl

The ATFL is intra-capsular (a capsular thickening), while the CFL is extra-capsular. When exploring the lateral gutter, the ATFL will be visualized immediately upon capsulotomy, but the CFL requires dissection inferiorly, deep to the peroneal tendon sheath.

Indications and Contraindications

Indications

• Chronic, symptomatic lateral ankle instability refractory to a minimum of 3 to 6 months of comprehensive conservative management (physical therapy, proprioceptive training, bracing).
• Positive anterior drawer and talar tilt tests on clinical examination, corroborated by stress radiography.
• Recurrent ankle sprains interfering with activities of daily living or athletic participation.

Contraindications

• Absolute: Active infection, severe peripheral vascular disease, inadequate soft tissue envelope.
• Relative: Generalized ligamentous laxity (e.g., Ehlers-Danlos, Marfan syndrome), severe uncorrected hindfoot varus (which will rapidly stretch out the repair), morbid obesity, and severe tibiotalar arthrosis. In patients with generalized laxity or poor tissue quality, an augmentation (e.g., internal brace or allograft reconstruction) should be considered.

Preoperative Planning and Patient Positioning

Imaging Workup

1. Weight-Bearing Radiographs: AP, lateral, and mortise views to assess for joint space narrowing, osteochondral lesions, and hindfoot alignment.
2. Stress Radiographs: Anterior drawer and varus talar tilt views. A talar tilt difference of >5 degrees compared to the contralateral side, or absolute tilt >10 degrees, is highly suggestive of mechanical instability.
3. Magnetic Resonance Imaging (MRI): Essential for evaluating the integrity of the ATFL and CFL, assessing the peroneal tendons for longitudinal tears, and ruling out osteochondral defects (OCDs) of the talus, which are present in up to 50% of patients with CLAI.

Anesthesia and Positioning

• Anesthesia: General anesthesia or regional spinal anesthesia is administered based on patient and anesthesiologist preference. A regional popliteal block may be added for postoperative analgesia.
• Positioning: Place the patient in the lateral decubitus position. Alternatively, the patient may be placed supine with a substantial bump under the ipsilateral hip to internally rotate the leg, bringing the lateral malleolus into a direct superior trajectory.
• Tourniquet: Apply a well-padded pneumatic tourniquet to the proximal thigh. Exsanguinate the extremity with an Esmarch bandage and inflate the tourniquet to the appropriate pressure (typically 250-300 mm Hg).

Step-by-Step Surgical Technique

1. Incision and Superficial Dissection

Make a curvilinear incision starting along the anterior-inferior border of the lateral malleolus. Extend the incision distally and posteriorly, ending just as the peroneal tendons are encountered (approximately 4 to 5 cm in length).

Carefully deepen the incision through the subcutaneous tissue.
* Vascular Control: Identify, divide, and ligate the lesser saphenous vein, which frequently crosses the operative field.
* Neurological Protection: Meticulous dissection is required to avoid the intermediate dorsal cutaneous nerve (the lateral branch of the superficial peroneal nerve), which often lies near the talar insertion of the ATFL. Similarly, protect the sural nerve, which courses posteriorly over the peroneal tendons. Retract these nerves gently with vessel loops if encountered.

⚠️ Surgical Warning

Injury to the superficial peroneal nerve or sural nerve can result in painful postoperative neuromas, which are often more debilitating than the original instability. Avoid aggressive retraction and use blunt dissection in the subcutaneous layers.

2. Mobilization of the Extensor Retinaculum

Identify the lateral portion of the inferior extensor retinaculum. This tissue layer lies superficial to the joint capsule. Carefully dissect the retinaculum off the underlying anterior joint capsule and mobilize it. Tag the retinaculum with a suture for later advancement to the distal fibula at the conclusion of the procedure (the Gould modification).

3. Arthrotomy and Joint Inspection

Make a vertical capsular incision along the anterior border of the fibula. Crucially, leave a 3 to 4 mm cuff of tissue attached to the fibula. This cuff is essential for the later reattachment and repair of the ligaments.

Before proceeding with the repair, inspect the tibiotalar and talofibular joints.
* Irrigate the joint to improve visualization.
* Examine for loose bodies, soft tissue impingement (e.g., Bassett's ligament or hypertrophic synovitis), and articular cartilage damage.
* Address any traumatic osteochondritis dissecans (OCD) lesions as dictated by preoperative planning (e.g., debridement, microfracture, or fixation).

4. Identification of the Ligaments

• ATFL: Identify the attenuated ATFL, which typically presents as a thickened, disorganized band within the anterior capsule.
• CFL: Locate the CFL in the distal, inferior portion of the wound. It runs from the tip of the fibula deep to the peroneal tendons. Retract the peroneal tendons posteriorly to visualize the CFL. The ligament is usually attenuated, elongated, or avulsed from the fibula. Occasionally, it may be torn from its calcaneal insertion, which complicates the repair and requires deeper dissection.

5. Anatomical Repair (The Broström Component)

Place the ankle in neutral to slight eversion, and the foot in valgus-abduction. Have an assistant hold the foot rigidly in this position for the remainder of the repair to ensure the ligaments are tensioned appropriately.

• Tissue Preparation: Trim any redundant, non-viable, or severely scarred tissue from the ATFL and CFL to ensure healthy tissue-to-tissue or tissue-to-bone healing.
• Suturing Technique: Repair the ligaments using heavy, non-absorbable permanent sutures (e.g., #0 or 2-0 braided polyester or ultra-high-molecular-weight polyethylene).
  • Direct Repair: If the tissue quality is robust, perform an end-to-end repair or a "vest-over-pants" (imbrication) technique to shorten and tighten the ligaments.
  • Bone Reattachment: If the ligaments are avulsed from the fibula, reattach them using drill holes through the distal fibula or, more commonly in modern practice, using biocomposite or metallic suture anchors placed into the anatomical footprints of the ATFL and CFL on the fibula.

6. Intraoperative Stability Testing

Once the sutures are tied, gently test the stability of the ankle.
* Perform an anterior drawer test and a talar tilt test. The ankle should feel solid with a firm endpoint.
* Move the ankle through a full range of motion (plantar flexion and dorsiflexion) to ensure that the repair has not over-constrained the joint, which could lead to postoperative stiffness.

7. The Gould Modification

Retrieve the previously tagged lateral extensor retinaculum. Pull the retinaculum tightly over the repaired ATFL and CFL, advancing it toward the distal fibula.
* Suture the retinaculum to the fibular periosteum or the fibular capsular cuff using 2-0 absorbable sutures (e.g., chromic gut or Vicryl).
* This step acts as a "living brace," limiting excessive inversion, reinforcing the primary repair, and stabilizing the subtalar joint.

Following the retinacular advancement, the foot should be limited in inversion and adduction to just past neutral. Re-check dorsal tilt, talar tilt, and sagittal range of motion.

8. Management of the Os Subfibulare / Avulsion Ossicles

Frequently, chronic instability is associated with an avulsion fracture of the distal fibula (os subfibulare). The management of this ossicle depends on its size:
* Large Ossicle: If the bone fragment is large enough to accept hardware, freshen the non-union bed on both the ossicle and the fibula with a curette or burr. Reattach the ossicle rigidly using a small fragment screw or K-wires.
* Small Ossicle: If the fragment is small, it can be used as a guide to locate the anatomical insertion of the ligament. The surgeon may pass sutures directly through or around the ossicle to secure the ligament to the fibula. Alternatively, the small ossicle can be sharply excised, and the ligament advanced directly to the freshened fibular footprint.

9. Irrigation and Closure

• Thoroughly irrigate the wound with sterile saline or bacitracin-infused solution.
• Inject the surrounding soft tissues and joint capsule with 0.25% bupivacaine (without epinephrine) for preemptive postoperative analgesia.
• Close the subcutaneous tissue in layers using absorbable sutures (e.g., 3-0 Vicryl) to eliminate dead space.
• Approximate the skin edges with a running subcuticular absorbable stitch or interrupted nylon sutures, followed by adhesive strips (Steri-Strips).
• Apply sterile dressings. While holding the ankle in strict neutral dorsiflexion and slight eversion, apply a well-padded anteroposterior plaster splint or a bulky Jones dressing with a posterior slab.

💡 Clinical Pearl

Immobilizing the ankle in neutral dorsiflexion and slight eversion is critical. Equinus positioning (plantar flexion) during casting will allow the ATFL to heal in an elongated, lax position, leading to recurrent instability.

Postoperative Care and Rehabilitation Protocol

The success of a Modified Broström-Gould procedure relies heavily on strict adherence to a phased rehabilitation protocol. Complete rehabilitation of the peroneal tendons is essential to provide dynamic stability to the lateral ankle.

Phase I: Protection and Healing (Weeks 0 to 4)

• Days 1 to 7: The patient is strictly non-weight-bearing on crutches. The extremity must remain elevated above heart level to minimize edema and prevent wound complications.
• Days 7 to 14: The patient returns to the clinic for a wound check and suture removal. The initial splint is transitioned to a short-leg nonwalking cast or a rigid fracture boot locked in neutral dorsiflexion.
• Weeks 2 to 4: The patient remains non-weight-bearing in the cast or boot.

Phase II: Early Mobilization (Weeks 4 to 6)

• At 4 weeks postoperatively, the cast is removed. The patient is transitioned to a functional air splint, lace-up ankle brace, or controlled ankle motion (CAM) boot.
• Weight-bearing is progressively advanced to full weight-bearing as tolerated.
• Gentle, active range-of-motion (ROM) exercises are initiated, focusing strictly on sagittal plane motion (plantar flexion and dorsiflexion). Inversion is strictly prohibited to protect the healing ligaments.

Phase III: Strengthening and Proprioception (Weeks 6 to 8)

• Formal physical therapy begins.
• Initiate isometric peroneal strengthening exercises, gradually progressing to isotonic resistance bands.
• Proprioceptive training is introduced (e.g., single-leg stance, BAPS board, wobble board) to retrain the neuromuscular pathways disrupted by chronic instability and surgery.

Phase IV: Return to Activity (Weeks 8 to 12+)

• At 8 to 12 weeks, if the patient demonstrates normal peroneal strength, full pain-free sagittal ROM, and excellent proprioceptive control, they are encouraged to begin sport-specific drills (e.g., figure-of-eight running, cutting maneuvers).
• Return to competitive sports or high-impact activities (e.g., dancing, basketball, soccer) is typically permitted between 3 to 4 months postoperatively.
• Patients are advised to wear a prophylactic lace-up ankle brace or undergo athletic taping during high-risk activities for the first 6 to 12 months post-surgery.

Complications and Pitfalls

While the Modified Broström-Gould procedure boasts a success rate exceeding 90%, complications can occur:

1. Nerve Injury: The most common complication is neurapraxia or neuroma of the superficial peroneal nerve or sural nerve. Meticulous superficial dissection is the primary preventative measure.
2. Recurrent Instability: Can occur due to failure to address underlying mechanical malalignment (e.g., cavovarus foot), generalized hyperlaxity, or premature return to sports.
3. Ankle Stiffness: Over-tightening the repair or prolonged immobilization can lead to a loss of inversion and plantar flexion. Ensuring the foot is in neutral (not excessive eversion) during the repair and initiating sagittal ROM at 4 weeks mitigates this risk.

4. Wound Dehiscence: The lateral ankle has a tenuous blood supply. Excessive retraction or early dependent positioning can lead to skin edge necrosis. Strict elevation in the first postoperative week is mandatory.