Quick answer
Differentiating mid-substance from insertional Achilles tendinopathy matters because the tendon is exposed to different mechanical stresses in each location. Exercise range, compression, imaging findings and operative options can therefore differ.
Article
Exercise is not one-size-fits-all
A classic eccentric heel-drop program performed below the level of a step may be tolerated in mid-substance disease but can increase compression at an irritable insertion. Insertional programs often begin with a reduced dorsiflexion range.
Adjuncts have different evidence
Evidence for shockwave and injections is not interchangeable between locations. For example, a 2025 randomised trial found that adding radial shockwave to education and exercise did not improve insertional outcomes over sham at 12 weeks.
Surgery is anatomically different
Mid-substance surgery may focus on diseased tendon and adhesions, while insertional surgery may require debridement at the tendon-bone interface, management of calcification or bony prominence, and sometimes tendon reattachment or reconstruction.
Key points
- Location changes loading strategy.
- Do not extrapolate evidence from mid-substance disease to insertional disease without caution.
- A precise diagnosis reduces the risk of repeating an unsuitable generic protocol.
Frequently Asked Questions
Can I have both?
Yes. Pathology can involve more than one region, although one area may be clinically dominant.
Can ultrasound tell the difference?
Usually it can localise structural abnormalities, but clinical correlation remains essential.