Outcomes of Plantaris Tendon Augmentation in Acute Achilles Tendon Rupture Repair

Abstract

Category:Trauma; Ankle; Hindfoot; SportsIntroduction/Purpose:Given the lack of consensus regarding the optimal surgical treatment for acute Achilles tendon ruptures, identifying techniques to maximize functional outcomes is crucial. Augmentation of Achilles tendon repair with the plantaris tendon is an established surgical technique that is thought to improve outcomes by reinforcing the repair site as well as decreasing soft tissue adhesions, though no studies have specifically looked at outcomes of its use. The purpose of this study is to compare the outcomes of acute Achilles tendon repairs managed with and without plantaris tendon augmentation.Methods:A retrospective review of patients undergoing open repair of acute Achilles tendon ruptures with a single fellowship- trained foot & ankle surgeon from 2010-2016 was performed. Patients <18 years of age, those whose procedures were >21 days from the date of injury, or whose repair was augmented with a flexor hallucis longus (FHL) tendon transfer or V-Y advancement were excluded. Operative report review determined if repair included plantaris augmentation. Augmentation involved weaving the tendon through the Achilles above and below the rupture site creating a box type biologic augmentation. Patients were contacted at >=2 years postoperatively to complete the Foot & Ankle Ability Measure (FAAM)-Activities of Daily Living (ADL) and -Sports subscales, visual analog scale (VAS) for pain, as well as surveyed regarding their satisfaction with the surgical outcome using a 5- point Likert scale. Mann-Whitney U, Chi-squared and Fisher’s exact tests were performed to compare patient variables and postoperative outcomes.Results:One hundred twenty-eight patients undergoing repair of an acute Achilles tendon rupture were included, including 59 (46.1%) with plantaris tendon augmentation and 69 (53.9%) without. The two patient cohorts did not differ in any preoperative patient variables (p>0.0892). Patients with and without plantaris augmentation did not experience any significant difference in the rate of postoperative complications (p=1.000), including a 0% re-rupture rate in each group. Additionally, at an average follow-up of 57.1 months, the groups did not differ in FAAM-ADL score (p=0.7116), FAAM-Sports score (p=0.4024), the Single Assessment Numeric Evaluation (SANE) as part of the FAAM-Sports subscale (p=0.2572), VAS pain (p=0.1885), or outcome satisfaction (p=0.7317).Conclusion:Our study demonstrates that plantaris tendon augmentation does not improve patient functional outcomes following acute Achilles tendon repair, but also is not associated with increased complication rates. Further studies, including either higher-level prospective, randomized clinical studies or biomechanical evaluation of the technique, are indicated to justify this adjunctive procedure.