Differentiating Buttock Pain - Gluteal Tendinopathy
Original Editors - Mariam Hashem
Deep Gluteal pain is a complex condition that could be the manifestation of different soft tissue pathologies. Due to the complexity of the anatomy the symptoms are overlapping. Scans such as MRI and ultrasound don't rule out the irritating source of pain and the special tests often don't discriminate the underlying structures that contribute to the symptoms.
Gluteal Tendinopathy is a potential source of deep gluteal pain. The condition has been introduced as a concept very recently in the research compared to other structures that can cause gluteal pain such as Sacroiliac Joint and the Lumbar region.
Previously known as Greater Trochanteric Pain Syndrome is a pain that starts in the greater trochanter region and may radiate to the lateral thigh and/or leg. Trochanteric Pain primarily is caused by the gluteal tendons and a secondary cause of this pain is the bursal inflammation that used to be thought as the main source of pain. Other structures that could be involved in the pathology are the posterior hip capsule, Gemelli's and the Obturators. Patients with Gluteal Tendinopathy have been shown to have high levels of anxiety and many of the patients experience pain almost the whole day.
This condition has a significant impact on sleep quality, physical activity, work participation and the quality of life similar to patients waiting for a hip replacement for severe hip osteoarthritis.. The pain of Gluteal Tendon origin can refer to the sacroiliac region, the buttock, the groin and into the anterior thigh. This overlap of referral pattern doesn't help in differentiating other pathologies.
Gluteal Tendinopathy is more relevant in females over 40 years old and believed to be present in 23.5% of women who are at risk of knee osteoarthritis. A percentage of 73 of the patients are believed to be either menopausal or peri-menopausal indicating a link between hormonal changes and tendinopathy. Certain medications are also shown to influence the tendon structural changes such as quinolone antibiotics, oestrogen inhibitors such as Tamoxifen for patients who had breast cancer. Most people wait 7.1 weeks to 4.4 years before seeking treatment for their symptoms. 
Other factors that were found to affect the presence and prognosis of Tendinopathy are:
- Changes in load either underload or overload that cause repetitive friction between the ITB and the greater trochanter
Risk factors are:
- Female gender 
- Older age
- Higher BMI
- Back pain
- Lower femoral neck angle
- Lipid levels
- Adiposity especially in women that carry more fat around the hips
Factors such as greater psychological stress, poorer quality of life, greater waist girth and a higher BMI were relevant in severe cases. However, these factors might also develop as a result of pain. But in most cases, pathology is a precursor to pain in tendinopathy. From literature, it seems that factors increasing the risk of developing pain in people with asymptomatic tendinopathy are emotional and cognitive risk factors like anxiety and maladaptive pain beliefs leading to fear avoidance.
Depression has also been identified as a significant component of the patient profile of those with severe gluteal tendinopathy (10), suggesting that clinicians should screen for psychological distress, or the presence of possible depression in patients with lower limb tendinopathies, to better manage these complaints (54).
Other factors such as depression, kinesiophobia and catastrophisation have been linked in gluteal tendinopathy with increased symptom severity. Depression is also a major component of patients with severe gluteal tendinopathy which means that therapists should be aware of this and screen for depression or psychological distress to be able to manage their patient's symptoms and refer appropriately when needed. 
The exact mechanism of how these risk factors influence the development of tendinopathy is mostly unknown. Read the recent article by Mallarias and O'Neil (2020) to learn more about the current thoughts on the influence.
There are important measures in diagnosing Gluteal Tendinopathy:
- Patient's history such as gender, BMI, age and history of loading
- Pain location: lateral hip pain.
- Pain severity: usually 4/10 on most days
- Palpation: tenderness over the superior aspect of the greater trochanter (the insertional point of glute medius and glute minimus)
- FADER or FADER resisted tests ( flexion adduction external rotation position). Pain over the lateral hip region is a positive test and could be diagnostic of gluteal tendinopathy. If the pain was reported in the deep gluteal region it could indicate deep gluteal pain syndrome. When the leg is flexion> 60 degrees, adduction, external rotation, the Piriformis becomes an internal rotator. Also, glute med and glute max swap roles from being an external rotator to being an internal rotator.
- A common sign is a reported difficulty in walking after sitting for a period of time often described as'' hobbling''.
To rule out osteoarthritis of the hip, the subjective history of the patient and FADIR (flexion adduction internal rotation test) are used. A positive FADIR test might not rule out OA completely but a negative test is recognised to rule out intra-articular hip pathologies such as OA, Femoral Acetabular Impingement or Labral tear. Also, in hip Osteoarthritis hip flexion ROM tends to be reduced.
Hip External Rotator; Gemelli's, Obturators and Quadratus femori have been included in Lateral hip pain pathology. They are positioned at 90 degrees to the long axis of the hip and serve important functions:
- Compress the hip joint and to provide stability at the joint.
- Reinforce the posterior capsule of the hip
Management of Gluteal Tendinopathy
Patient education is considered the most important part of management. Education includes the patient in the management and puts them in control with their treatment plan. Managing associated or provoking factors such as hormonal changes, co-morbidities, sleep, smoking and medications should be explained and discussed with the patient. Although some of these factors might not be modifiable however patients should be aware of them.
Promotion of healthy lifestyle changes such as quitting smoking and weight loss is integral in the management of Tendinopathy.
Load management is used in the management of tendinopathy by gently increasing the load on the tendon and managing the ''weekend-warrior exercise'' or load and no-load scenario.
- Stretches should be avoided especially Tensor Fascia Lata muscle that compresses the Gluteus medius and minimus tendons
- Crossing the legs especially with the affected leg on top of the non-affected
- Standing or hanging on one leg
- Lying on the affected side or non-affected without a firm pillow in between the legs
- Dynamic valgus (hip adduction and internal rotation) during loading activities as it increases compression and tensile loading on the damaged tendon.
The Visa G questionnaire was validated by Fearon et al  as an outcome measure for disability resulting from lateral hip pain. The questionnaire looks at activities such as lying on the affected side, stairs negotiation and the overall severity of the hip pain.here.
Selection of exercises
- Hip abductor strength is not associated with the severity of the Gluteal tendinopathy
- Compression forces can aggravate the lateral hip pain. An exercise such as Clam can provoke the tendon pain due to the high compressive force
- Hip flexion should be avoided as it can negatively affect motor control and optimal muscle activation when Tensor Facia Lata and superficial hip flexors dominate over hip abductors and external rotators
- Exercises should be progressive meaning that load should be increased gradually. The load can be managed by adjusting frequency, repetitions, resistance.
- It is recommended to start the rehabilitation with isometric exercises as it proved to have an analgesic effect on tendon pain and can be used as an entry into rehabilitation and as 'in-season' for athletes to reduce pain and control symptoms
- Loading should be monitored by observing the pain level following the exercises. A 4/10 pain during the exercise and no worse over 24 hours is ideal.
- Build up the resistance to 4/10 intensity. Hold for 30 seconds. repeat 5 times daily.
- Advice the patients to perform the exercises slowly to stimulate the deep stability system of the muscle.
- Rio et al recommended the use of external motor control cues such as visual (mirror, video and pressure feedback) auditory (exercise metronome) and mental (mental rehearsing of the task) to stimulate neuroplastic changes
- No pain should be allowed during functional tasks such as lunges, step-ups as it reflects the poor control of optimal alignment and increased compression on the Gluteal Tendon
- Encourage exercises from a neutral lumbar spine.
- An exercise that flares up the patient's symptoms shouldn't necessarily be avoided. Either return to this exercise later in the rehab stages or reduce the load and monitor the symptoms
Recommended Exercise Programme:
|Week 1 Early|| Isometric Abduction
| In standing or Lying, against the wall, bridging with resisted abduction
In standing or Lying, against the wall, supine into a ball
|Low effort. Build up resistance slowly to a 4/10 pain max. 30-45 sec hold. 5-8 reps. 1-2 sets throughout the day.|
|Week 2|| Isotonic:side-lying against gravity
Standing Abduction/External Rotation Motor Control
| Modified clam using an elastic band to increase resistance
Bilateral. Starting with light resistance Glute Max over the bed
| Moderate effort. 8-12 reps. 2 sets once daily
Light effort to activate Glutes Max before hamstrings or back extensor with 10 seconds holds
|Week 3|| Neuroplastic Training
| Fire Hydrant-progress to doing the exercise with resistance
Off-set Bridge, Single-Leg Bridge, Hip Drop Bridge
|High load. 6-8 reps. 1 set.Once Daily
10 reps. 1-3 sets
|Week 4-6||Increase loading to incorporate functional high loading with heavy slow resistance||Abduction slides
Proprioception functional loading The Bird Dog Lateral Step Down
|Progressive. Increase resistance.8-12 Reps, 3 sets. 3-4 times weekly. Stop modified clam and optimal Glute Max|
|Week 6-12 Late Rehab||Increase loading. Sports specific exercises|| Single-Leg squat
Backward Lunges on ball Contralateral split squat Step-up
|Increase weight-slow and heavy resistance. reduce reps as you increase the weight. 8-12 reps. 3 sets. 3-4 times weekly|
Other conservative options
Non-steroidal anti-inflammatory drugs
Some studies show that NSAIDs and topical NSAIDs (for 6 weeks) may play a role in GTPS treatment of chronic tendinopathy.
Extracorporeal Shock Wave Therapy (SWT)
SWT has been shown to be effective in GTPS, however, the exact mechanism of the effect on GTPS is unclear. Evidence is however limited.
Low-energy SWT seems to be more effective than cortisone injection at 4 months. Treatment regimens using SWT vary in practice and in research and could not be compared in a literature review by Reid (2016). 
In a study in Serbia on 2,217 patients over 6 years in patients with trochanteric bursitis/GTPS showed that local cortisone injection with multimodel physiotherapy it was effective in 49% of patients. Cortisone alone resulted in an improvement of 39%.  Some studies show an early improvement after injection, lasting up to 3 months, with a peak at 6 weeks, but in the longer term the symptoms of GTPS seam to return.
Surgical is indicated when the tendon refracted or the patients are not responding to conservative management. Some surgical options are bursectomy, ITB release, trochanteric reduction osteotomy, gluteal tendon repair, or a combination. Evidence on surgical options for GTPS is of low quality. Recently, endoscopic surgery is being investigated instead of open surgery. 
A case series of 11 patients showed successful following an endoscopic release fo the ITB including a bursectomy. This was done on patients who failed recovery after 1 year of conservative management which included stretching, abductor strengthening, a minimum of one cortisone injections and or ESWT. 
- Bell-Jenje T. Greater Trochanteric Pain Syndrome – Recommended Exercises & Progressions. Part 2. Groovimovements website. (Feb)2020. Available from: https://www.groovimovements.co.za/greater-trochanteric-pain-syndrome-recommended-exercises-progressions/
- Mest J, Vaughan B, Mulcahy J, Malliaras P. The Prevalence of Self-Reported Psychological Characteristics of Adults with Lower Limb Tendinopathy. Muscles, Ligaments & Tendons Journal (MLTJ). 2020 Oct 1;10(4).
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