INDUCE PAIN TO RELIEVE PAIN IN ROTATOR CUFF-RELATED SHOULDER PAIN?

Shoulder pain

“Should exercise be painful or not?” This is a popular question among both physiotherapists and patients, which is still a topic of large debate. Indeed, although exercise is a proven effective treatment in chronic rotator cuff-related shoulder pain, the level of pain during exercise is still unclear.

Pain-monitoring model

Image 1

A pain monitoring model is often used during exercise, which describes a scale from 0 to 10, where 0 is indicating “no pain” and 10 indicates “worst imaginable pain” (Thomee et al. 1997). Pain between 0 and 2 is considered “safe”, between 2 and 5 is “acceptable” and above 5 is “high risk”. Moreover, pain is allowed to reach 5 after exercise but it should decrease by the next morning. These are general guidelines that have been applied in clinical practice, studies, and with a variety of indications in shoulder rehabilitation (Holmgren et al. 2012, Maenhout et al. 2012, Valles-Carrascocsa et al. 2018).

What is the current practice among physiotherapists in shoulder rehabilitation?

Pain free shoulder training

The lack of clear evidence-based guidelines reflects also on the current clinical practice. Several surveys on the physiotherapeutic management of subacromial shoulder pain have been performed in 4 different countries (United Kingdom, Belgium, The Netherlands, and Italy)(Bury et al. 2018, Pieters et al. 2019, Brindisino et al. 2018) and showed variable results on the instructions about pain during exercise. Most physiotherapists instructed their patients not to have any pain or at least not more than acceptable discomfort. Experts in the field recently suggested using different types of exercises according to symptoms’ acceptability as long as they could sufficiently challenge weakness and train to fatigue(Littlewood et al. 2019).

Hurt ≠ Harm

Hurt harm

Physiotherapists usually don’t encourage patients to train in pain. However, there is no strong scientific basis for this fear of “exercising into pain”. Indeed, considering the principle that “hurt does not equal harm, a recent systematic review challenges this belief and suggests that painful exercises are more beneficial in short term compared to pain-free exercise in chronic musculoskeletal pain (Smith et al. 2017). Considering that pain does not always correspond to tissue damage (such as a tear or tendon degeneration), other factors such as fear of movement and central sensitization can play an important role in the development or maintenance of pain. If painful exercises are allowed with suitable “safety cues”, the physiotherapist can gradually reduce the threat perception of the painful movement (Smith et al. 2018). If the shoulder is considered “de-conditioned” and the purpose is to strengthen the shoulder muscles, the patients will re-think and re-modulate under the guidance of the treating physiotherapist.

No pain, no gain?

No pain no gain

We know from the literature that painful exercises usually have higher loads or doses of exercises (sets and repetitions). We also know that higher loads or doses might give superior benefits. So, is a painful exercise program better than pain-free exercises? Will higher loads challenge the patient enough to gain strength and decrease pain? Is it feasible to exercise into pain and if so, which exercises should be prescribed?

We are trying to answer these important clinical questions at the University of Antwerp in Belgium. We already conducted a feasibility study on exercising into the pain in 12 shoulder pain patients with 4 individualized painful exercises (pain ranging between 4 and 7/10 during exercise). Preliminary results showed that most patients were able to train into pain, but for some 9 consecutive weeks was too much. However, overall, increasing loads with a tailored progression improved symptoms and increased functionality. More precise results on this feasibility trial and the large randomized controlled trial will be published soon.

References

Thomee R. A comprehensive treatment approach for patellofemoral pain syndrome in young women. Phys Ther. 1997;77(12):1690-703.

Holmgren T, Bjornsson Hallgren H, Oberg B, Adolfsson L, Johansson K. Effect of specific exercise strategy on need for surgery in patients with subacromial impingement syndrome: randomised controlled study. BMJ. 2012;344:e787.

Maenhout AG, Mahieu NN, De Muynck M, De Wilde LF, Cools AM. Does adding heavy load eccentric training to rehabilitation of patients with unilateral subacromial impingement result in better outcome? A randomized, clinical trial. Knee Surg Sports Traumatol Arthrosc. 2013;21(5):1158-67.

Valles-Carrascosa E, Gallego-Izquierdo T, Jimenez-Rejano JJ, Plaza-Manzano G, Pecos-Martin D, Hita-Contreras F et al. Pain, motion and function comparison of two exercise protocols for the rotator cuff and scapular stabilizers in patients with subacromial syndrome. J Hand Ther. 2018;31(2):227-37.

Bury J, Littlewood C. Rotator cuff disorders: a survey of current (2016) UK physiotherapy practice. Shoulder Elbow. 2018;10(1):52-61.

Pieters L, Voogt L, Bury J, Littlewood C, Feijen S, Cavaggion C et al. Rotator CUFF disorders: A survey of current physiotherapy practice in Belgium and the Netherlands. Musculoskelet Sci Pract. 2019;43:45-51.

Brindisino F, Matteuzzi I, Bury J, McCreesh K, Littlewood C. Rotator cuff disorders: A survey of current (2018) Italian physiotherapy practice. Physiother Pract Res. 2020;41(1):11-22.

Littlewood C, Bateman M, Connor C, Gibson J, Horsley I, Jaggi A et al. Physiotherapists’ recommendations for examination and treatment of rotator cuff related shoulder pain: A consensus exercise. Physiother Pract Res. 2019;40(2):87-94.

Smith BE, Hendrick P, Smith TO, Bateman M, Moffatt F, Rathleff MS et al. Should exercises be painful in the management of chronic musculoskeletal pain? A systematic review and meta-analysis. Br J Sports Med. 2017;51(23):1679-87.

Smith BE, Hendrick P, Bateman M, Holden S, Littlewood C, Smith TO et al. Musculoskeletal pain and exercise-challenging existing paradigms and introducing new. Br J Sports Med. 2019;53(14):907-12.

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