The answer depends on several factors: the type of surgery, the stage of tissue regeneration, the underlying diagnosis and the rehabilitation plan established by the treating doctor. In this article, I review the main considerations and explain what differences apply to particular types of surgery (knee and hip replacement, abdominal surgery and after cancer surgery).
Key point
Muscle stimulation (EMS, NMES) is an adjunctive method in post-surgical rehabilitation. It may be used only with the permission and protocol of the treating doctor or physiotherapist/sports physiotherapist. Timing, electrode placement and intensity vary by type of surgery. Starting treatment at home without medical approval should be avoided.
When is it beneficial and when is it a risk?
Muscle stimulation after surgery has two sides: scientific studies show that it may help reduce muscle atrophy and regain strength, but if poorly timed or incorrectly set, it may delay wound closure.
- Reducing muscle atrophy during the inactive period after surgery (particularly important after orthopaedic surgery)
- Earlier recovery of muscle strength – according to RCTs, quadriceps strength returns more quickly after knee replacement when rehabilitation is supplemented with NMES
- Supporting blood circulation in the treated muscle, which may contribute to the transport of nutrients and oxygen
- Supporting patient mobilisation: easier getting out of bed and improved muscle tone alongside active physiotherapy
- Thrombosis prevention through mechanical pumping of the venous circulation (documented in rehabilitation after hip replacement)
- Impaired wound closure – if the electrode is placed directly on or near a fresh suture, epithelialisation may be disturbed
- Soft-tissue tension caused by muscle contraction – stimulation that is too strong may place mechanical stress on the sutures
- Mobilisation of a deep-vein thrombosis – stimulation is not recommended if DVT is already present after surgery
- Skin irritation beneath the pads – on particularly sensitive post-operative skin
- Interference with an implanted device – caution is needed near the metal components of a hip or knee replacement
Types of surgery and specific considerations
In the accordion list below, I discuss the most common surgical situations: when muscle stimulation may be considered, within what timeframe and with what electrode placement.
After orthopaedic surgery (total knee replacement, hip replacement, ACL reconstruction), NMES is a well-documented adjunctive method. The 2012 Stevens-Lapsley RCT showed that high-intensity NMES started after knee replacement significantly supports recovery of quadriceps strength compared with conventional physiotherapy.
Timing: according to the treating doctor's individual assessment, generally 2–7 days after surgery, with intensity increased gradually. The electrode is NOT placed around the fresh surgical wound, but on the quadriceps muscle belly (mid-thigh). Details: strengthening the thigh muscles with a muscle stimulator.
The metal components of the replacement may slightly alter the stimulating current. This is not a contraindication, but pad placement and intensity should be discussed with the treating doctor or physiotherapist.
After anterior cruciate ligament reconstruction, meniscus surgery or shoulder-joint reconstruction, NMES may form part of the rehabilitation plan. The protocol is prepared by the sports physiotherapist or orthopaedic specialist according to the type of surgery and the technique used.
General principle: the stimulated muscle must NOT directly pull on the suture or implanted fixation devices. After ACL reconstruction, quadriceps stimulation is typically safe with the knee partly flexed (flexion reduces tensile stress on the graft).
After abdominal-wall hernia surgery or laparoscopic or open abdominal surgery, abdominal muscle stimulation should be used while maintaining a lasting distance from the surgical wound. Complete closure of the sutures generally takes 4–6 weeks. Until then, abdominal EMS is not recommended.
The principle of gradual loading applies to abdominal muscle strengthening after hernia surgery: stimulation may be started alongside active physiotherapy and only at a time approved by the treating doctor. Electrode placement over the sutures should be avoided permanently.
After disc herniation surgery, decompression or spinal fusion, muscle stimulation may be started specifically under the supervision of a neurologist, neurosurgeon or the operating team. Electrodes must not be placed directly around the surgical area (lumbar or cervical region), but stimulation of the limb muscles (quadriceps, gluteus) may be considered to help regain muscle strength.
Details: muscle stimulation and physiotherapy in disc herniation rehabilitation.
After cancer surgery, muscle stimulation may be used with the oncologist's approval and only in an area distant from the affected region. See the article on cancer and electrotherapy for details.
Special situation: in cases of lymphoedema after breast surgery (if the disease is not metastatic), low-intensity EMS on the arm may be considered with the lymphologist's approval, alongside combined compression treatment.
After heart surgery, coronary bypass, valve replacement or pacemaker/ICD implantation, home muscle stimulation is generally best avoided. A cardiologist may approve treatment only after individual assessment and in a controlled setting, using it on the limb muscles. Details: electrotherapy and implants.
After plastic surgery (liposuction, abdominoplasty, breast augmentation), muscle stimulation may be started after complete closure of the sutures (generally 6–8 weeks), with the plastic surgeon's approval. Early stimulation should be avoided because of the tension placed on the sutures, and freshly irritated skin is particularly sensitive.
When should we start? – Timing recommendations
The table below is general information and applies to average cases. The exact timing must always be determined by the treating doctor or rehabilitation team.
| Type of surgery | EMS/NMES start | Goal | Approval to start |
|---|---|---|---|
| Knee replacement (TKA) | 2–7 days (clinical) | Quadriceps strength | Orthopaedic specialist / physiotherapist |
| Hip replacement (THA) | 2–7 days (clinical) | Gluteus + quadriceps | Orthopaedic specialist / physiotherapist |
| ACL reconstruction | 1–2 weeks | Against quadriceps atrophy | Sports physician / physiotherapist |
| Abdominal/hernia surgery | 4–6 weeks | Abdominal strength (away from sutures) | Surgeon |
| Spinal surgery | 4–8 weeks, individual | Limb muscle strength | Neurosurgeon / neurologist |
| Cancer surgery | Individual assessment | Muscle strength in a distant region | Oncologist |
| Heart surgery, pacemaker | Generally no | – | Cardiologist |
| Plastic surgery | 6–8 weeks | Muscle tone | Plastic surgeon |
When should you postpone treatment?
- Wound leakage, an open wound or signs of inflammation at the surgical site
- Acute fever or suspected infection
- Suspected new deep-vein thrombosis (severe, one-sided limb pain or swelling)
- A period not approved by the treating doctor
- Severe pain during stimulation
Which device is suitable for post-surgical rehabilitation?
For post-surgical rehabilitation, choose a device that offers low-intensity starting levels, a programme that can be adjusted precisely and an NMES function. Devices focused on home rehabilitation are generally available in the entry to mid-range category.
Myolito (entry-level home EMS)
A 2-channel device with FES function, designed specifically for home muscle stimulation. Suitable for strengthening the quadriceps, gluteus and abdominal muscles, with intensity that can be increased gradually.
Rehalito (rehabilitation-focused)
A 2-channel TENS+EMS device with rehabilitation programmes. It may be used for orthopaedic and sports-rehabilitation indications within a protocol established by the treating doctor.
Globus Genesy 600 (PRO multifunctional)
A professional device with a wide range of programmes for specialist settings: NMES, microcurrent and IF combination programmes. Particularly suitable for rehabilitation centres.
The basic principle: always start treatment according to a protocol established by your doctor or physiotherapist/sports physiotherapist, and also follow the list of contraindications in the instructions for use.
Post-surgical contraindications
- Acute wound leakage, or an open or infected surgical wound
- Acute deep-vein thrombosis (DVT) – details in the contraindications article
- An implanted active electronic device (pacemaker, ICD, DBS, SCS) – consultation with the treating doctor is mandatory
- Pregnancy (treatment of the abdomen, lower abdomen and lower back is prohibited)
- Active cancer in the treated area
- A post-operative period not approved by the treating doctor
- Persistent, severe pain during treatment – stop immediately
Frequently asked questions
Starting "immediately" is never recommended on your own at home. In clinical practice, for example after knee replacement, NMES starts 2–7 days after surgery under the supervision of a hospital physiotherapist. Home use should start only after the treating doctor or physiotherapist has approved it in writing or during a consultation—generally 1–6 weeks after surgery, depending on the type of surgery.
Never over or directly around a fresh suture. For quadriceps stimulation, the pads can be placed on the middle of the thigh, outside the 5–10 cm zone above the kneecap. The physiotherapist will show you the exact electrode position during the first treatment. It is worth remembering it or taking a photograph for home use.
The duration varies from person to person. It depends on the type of surgery, age, pre-operative muscle strength and rehabilitation activity. After knee replacement, returning to the pre-operative level generally takes 3–6 months with intensive rehabilitation. NMES may support strength development, but it does not replace active physiotherapy.
If persistent, severe or stabbing pain develops, stop the treatment, switch off the device and remove the pads. Discuss the symptoms with your treating doctor or physiotherapist. The pad placement, intensity or programme may need to be changed. New pain of unknown origin—especially swelling or warmth suggesting deep-vein thrombosis—requires urgent medical assessment.
Yes. In fact, this is the most effective combination: active physiotherapy develops coordination and functional muscle activation, while NMES supports muscle strength and hypertrophy. The two complement each other. Follow the plan established by the rehabilitation team. For example, a 15–20-minute NMES session on the target muscles after a physiotherapy block.
Summary
A guide to when and under what conditions muscle stimulation (EMS, NMES) may be used during rehabilitation after different types of surgery (orthopaedic, abdominal, spinal, cancer, plastic and cardiac surgery).
People taking part in post-surgical rehabilitation, relatives, physiotherapists and sports physiotherapy professionals.
Muscle stimulation is an adjunctive part of post-surgical rehabilitation. The treating doctor or physiotherapist must always determine the timing, electrode position and intensity. The protocol should be used together with active physiotherapy.
Read about the general contraindications of electrotherapy, the article on regaining muscle strength, or surgery-specific indications (disc herniation rehabilitation, thigh muscle strengthening).
Scientific references
- Stevens-Lapsley JE, et al. Relationship between intensity of quadriceps muscle neuromuscular electrical stimulation and strength recovery after total knee arthroplasty – Physical Therapy, 2012. PubMed: 22652985
- Kittelson AJ, Stackhouse SK, Stevens-Lapsley JE. Neuromuscular electrical stimulation after total joint arthroplasty: a critical review of recent controlled studies – European Journal of Physical and Rehabilitation Medicine, 2013. PubMed: 24285026
- Imoto AM, et al. Is neuromuscular electrical stimulation effective for improving pain, function and activities of daily living of knee osteoarthritis patients? – Sao Paulo Medical Journal, 2013. PubMed: 23657509
