Rent the STAK Tool and unlock expert support to overcome knee stiffness, regain strength, and restore mobility at home.
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The STAK is a new clinically proven medical stretching device for home use which enables patients to perform effective daily stretching to regain their range of movement and function following knee replacement, major knee surgery or injury. It is light and easy to use, the STAK is supplied with an accompanying chair which works in harmony with the STAK tool to enable optimal, comfortable high intensity stretching. The STAK is both self-motivating and empowering giving patients the best possible outcomes.
The STAK enables you the patient to generate high-intensity stretches which will break down the scar tissue in your knee which is causing stiffness and pain.
Once the STAK has enabled you to break down the scar tissue new tissue will form and you will regain your range of movement. You will see improvements in the first few days and we recommend that the treatment continues over 8 weeks.
Dr. Sara Aspinall, Founder & Lead Physiotherapist at STAK, brings nearly two decades of experience in treating and researching knee arthrofibrosis. She is the UK’s foremost expert in arthrofibrosis following knee surgery, holding a PhD in knee stiffness (arthrofibrosis) from Loughborough University. Her scientific expertise and dedication to exceptional patient care make her and her team uniquely qualified to guide you through your recovery.
What to Expect in Your First Virtual Physio Session:
In your initial session we will:
Our virtual sessions are designed to be highly effective and convenient, allowing you to perform exercises in the comfort of your own home, with repeatable results. You’ll notice improvements from the very first session, and soon, family and friends will see the positive changes in you.
During your follow-up sessions, we will:
Monitor your progress and track your range of motion.
Address any issues that arise, working through them together.
Ensure correct exercise and stretching techniques.
Take a holistic approach to any secondary issues, such as back or calf pain, that may have developed due to prolonged knee stiffness.
The second session is crucial to ensure you’re performing exercises and stretches correctly. As your knee adapts to its new range of motion, Dr. Aspinall and her team will guide you to achieve the best possible outcome in the shortest time.
For severe cases, virtual sessions with Dr. Aspinall and her team are highly recommended to maximise the effectiveness of the STAK tool. While many users benefit significantly from the tool alone, virtual sessions offer additional support and personalised guidance.
Recognising the financial and logistical challenges of in-person physiotherapy—such as session costs averaging £75, transportation, and time off work—Dr. Aspinall offers virtual sessions that deliver evidence-based recovery strategies from the comfort of your home.
Drawing on her extensive expertise, Dr. Aspinall and her team deliver personalised, professional, and friendly treatment, ensuring you receive the highest level of care to help you regain your quality of life.
Our research shows that 92% of patients found physiotherapy support indispensable to their recovery.
The STAK Knee Stretcher is a clinically proven home-use rehabilitation device, designed to help you recover mobility and break down scar tissue after knee replacement, major knee surgery, or traumatic injury. Whether you’re struggling with arthrofibrosis or general post-operative stiffness, the STAK tool enables safe, high-intensity daily stretching to restore your range of motion and relieve pain—right from the comfort of your home.
✅ Lightweight and easy to use
✅ Delivered with a supportive chair for optimal positioning
✅ Self-guided and empowering knee rehab tool
✅ Suitable for recent or historic injuries
The STAK rehabilitation device helps generate the intensity of stretch required to break down internal scar tissue that causes stiffness and limits mobility. With consistent daily use, you’ll begin to:
Regain flexibility
Reduce pain
Restore functional movement
Feel improvement within the first few days
For optimal results, we recommend an 8-week home rehab programme using the STAK tool, optionally supported by virtual physiotherapy sessions.
In your ongoing sessions, we will:
🦵 Ensure correct stretching technique for maximum benefit
💬 Address any discomfort or secondary issues (e.g., back or calf pain)
🎯 Adjust your STAK regimen as your mobility improves
Session 2 is particularly important to ensure your technique is correct and to prevent compensation issues. As your knee regains flexibility, Dr. Aspinall’s team will help you adapt the programme to achieve faster and more lasting results.
In-person physiotherapy can be costly and inconvenient—average UK physio sessions cost £75+, plus the hassle of travel and time off work. Our virtual knee physio sessions give you direct access to expert care from anywhere in the UK, without compromising results.
💡 Our data shows that 92% of users found virtual physio support essential to their STAK-based recovery.
Whether you’re in early-stage recovery or dealing with long-term knee stiffness, our expert team offers clinical-grade guidance, motivation, and accountability—so you stay on track and see real change.
We’re so confident that your patients will see and feel immediate improvements after their first session with the STAK that we’re offering a money-back guarantee:
The STAK Orthopaedic Tool is a patented device. STAK is a registered Trademark ® of STAK Orthopaedics Ltd.
