Record maximum height and number of heel rises in HRET

Provide additional validation of the outcome measure

Ask patient which intervention they think they received in 24-week postassessment questionnaire

Assessment of success of blinding strategy

Stipulate guidelines for rehabilitation

To accommodate local preferences while ensuring the integrity and success of the trial

Added guidance if allocated intervention cannot be given

Guidance was omitted in original protocol version

Clarifications on the nature of the injury

Clarify injury type

Change inclusion criteria

Increase upper age limit with requirement of ambulatory status

Increase recruitment period

12 days postinjury instead of 7

Extended scope physiotherapists can administer the intervention

Pragmatic approach to accommodate for clinical practice

Clarification of the ATR diagnosis

Clarification of the rupture location

Clarification of anticoagulation

VTE prophylaxis requirement

Randomisation and statistical alterations

Approval of randomisation and statistical plan

Extended 24 months follow-up

To study PRP on effect on the quality of the repaired Achilles tendon at 2 years postinjury

Extend recruitment by 2 months

Increase sample size to 230

DSMC blinded interim data analysis found HRET SD is 24 with larger variability in data. Sample size increased to guarantee 80% power