Surgical plantaris tendon removal for patients with plantaris tendon-related pain only and a normal Achilles tendon: A case series

Abstract

Objectives Surgical removal of the plantaris tendon can cure plantaris-associated Achilles tendinopathy, a condition in which Achilles and plantaris tendinopathy coexist. However, rare cases with plantaris tendinopathy alone are often misdiagnosed due to a normal Achilles tendon. Design and setting Prospective case series study at one centre. Participants Ten consecutive patients (9 men and one woman, mean age 35 years, range 19-67) with plantaris tendon-related pain alone in altogether 13 tendons were included. All had had a long duration (median 10 months, range 3 months to 10 years) of pain symptoms on the medial side of the Achilles tendon mid-portion. Preoperative ultrasound showed thickened plantaris tendon but a normal Achilles tendon. Interventions Operative treatment consisting of ultrasound-guided excision of the plantaris tendon. Primary and secondary outcome measures Scores from Victorian Institute of Sports Assessment-Achilles questionnaire (VISA-A)were taken preoperatively and postoperatively (median duration 10 months). Patient satisfaction and time until full return to sports activity level was asked by a questionnaire. Results The VISA-A scores increased from 61 (range 45- 81) preoperatively to 97 (range 94-100) postoperatively (p<0.01). Follow-up results at 10 months (range 7-72 months) on 9/10 patients showed full satisfaction and return to their preinjury sports or recreational activity Conclusion The plantaris tendon should be kept in mind when evaluating painful conditions in the Achilles tendon region, especially when no Achilles tendinopathy is present. Excision of the plantaris tendon via a minor surgical procedure in local anaesthesia results in a good outcome.