The split peroneus brevis tendon procedure addresses a specific symptomatic issue within the lateral ankle complex, where the tendon becomes symptomatic due to partial tearing or elongation. This technique involves creating a longitudinal split within the substance of the peroneus brevis tendon and then passing one limb through the other in a figure-of-eight fashion to effectively shorten and tighten the path. The goal is to restore the normal tension and function of the tendon, thereby stabilizing the lateral ankle and preventing excessive translation of the fibula during weight-bearing activities.
Understanding the Peroneus Brevis Tendon
The peroneus brevis tendon plays a critical role in dynamic ankle stability, originating from the distal fibula and inserting on the base of the fifth metatarsal. Its primary actions include plantarflexion of the ankle and, most importantly, eversion and stabilization of the foot against inversion forces. During repetitive activities or following an acute inversion injury, the tendon can sustain microtrauma, leading to tears, thickening, or attenuation. When these changes compromise the structural integrity of the tendon, the split procedure offers a targeted solution to reinforce its function without requiring a complete tenodesis or graft.
Indications for the Procedure
Surgeons typically consider this intervention for patients who present with chronic lateral ankle instability that has failed to respond to structured physiotherapy. Specifically, it is indicated when clinical examination and imaging, such as magnetic resonance imaging, demonstrate a significant partial tear or elongation of the peroneus brevis without complete rupture. The procedure is also suitable for cases involving attenuation of the tendon where a primary repair would be insufficient to restore the necessary tension, thereby addressing the mechanical laxity that contributes to the sensation of giving way.
Surgical Technique and Execution
The operation is generally performed under regional or general anesthesia with the patient positioned supine. A standard lateral approach to the ankle is utilized to expose the peroneal tendons, taking care to stay subperiosteal to minimize soft tissue stripping. After identifying the split peroneus brevis tendon, a longitudinal incision is made within its substance, taking care to avoid the superior and inferior vascular territories. The two resulting limbs are then woven in a figure-of-eight pattern, and the tension is meticulously adjusted to ensure stability while allowing for normal excursion during dorsiflexion and plantarflexion.
Postoperative Rehabilitation Protocol
Recovery following the split peroneus brevis tendon procedure is methodical and requires strict adherence to a protected weight-bearing schedule. Initially, a below-knee cast or walking boot is applied for approximately six weeks to allow the tendon to heal in the corrected position. Subsequently, a graduated mobilization program is initiated, focusing on restoring range of motion, controlling edema, and combating muscular atrophy. Physical therapy progresses to include proprioceptive training and strengthening exercises, ultimately aiming to return the patient to full functional activities, including sports, within three to four months.
Potential Risks and Complications
As with any surgical intervention, there are inherent risks associated with the split peroneus brevis tendon technique. These include general perioperative complications such as infection, deep vein thrombosis, and adverse reactions to anesthesia. Specific to the procedure, there is a risk of incomplete correction, overtightening leading to loss of motion, or delayed healing of the tendon. In rare instances, nerve irritation may occur, resulting in temporary or permanent neuropraxia, underscoring the importance of an experienced surgical team.
Prognosis and Long-Term Outcomes
When performed correctly in appropriately selected patients, the split peroneus brevis tendon procedure yields high rates of success regarding the restoration of ankle stability. Long-term follow-up studies indicate significant improvements in subjective stability scores and a reduced incidence of recurrent sprains. The preservation of the tendon’s length and vascularity, compared to more radical procedures, contributes to a more favorable functional outcome, allowing patients to resume their daily routines with confidence and minimal lingering discomfort.
