American Hip Institute

Partial-Thickness Tears of the Gluteus Medius: Rationale and Technique 2010


Tears in the gluteus medius and minimus tendons, often misdiagnosed as trochanteric bursitis, have recently emerged as an important cause of recalcitrant greater trochanter pain syndrome. Advances in endoscopic surgery of the hip have created opportunities to better evaluate and treat pathology in the peritrochanteric compartment. We reviewed the literature on trochanteric pain syndrome and gluteus medius tendon injuries. Existing techniques for endoscopic and open gluteus tendon repair and potential challenges in restoration of abductor function were analyzed. Partial-thickness undersurface tears of the gluteus medius were identified as a common pathologic entity. Although these tears are otherwise analogous to partial-thickness tears of the rotator cuff, the lack of arthroscopic access to the deep side of the gluteus medius tendon represents a unique technical challenge. To address the difficulty in visualizing and thus repairing undersurface tears of the gluteus medius, a novel endoscopic trans-tendinous repair technique was developed. The purposes of this article are to review the anatomy, pathology, and existing repair techniques of gluteus medius tendon tears and to describe the rationale and surgical steps for endoscopic trans-tendinous repair.

Greater trochanteric pain syndrome (GTPS) is a common complaint with an estimated incidence of 1.8 per 1,000 persons.1 Patients usually present with a dull pain on the lateral aspect of the hip, sometimes with radiation posteriorly and into the thigh. The pain is aggravated by pressure on the area, weight bearing, and resisted hip abduction. Historically, if the pain was associated with tenderness over the area of the greater trochanter, the diagnosis of trochanteric bursitis was presumed. After failure of initial conservative treatment consisting of anti-inflammatory therapy and lifestyle modifications, corticosteroid injections have been commonly used. Surgical treatment has rarely been recommended, and in patients who receive only temporary relief after injections, multiple injections have often been administered. Recent studies have disproved the theory that the pathology underlying the pain is due to inflammation of the bursae.2 Tears of the gluteus tendons can be the source of such lateral hip pain3456789 and 10 and can cause significant morbidity. However, these tears are often missed, or misdiagnosed as bursitis, resulting in prolonged chronic peritrochanteric pain. Fortunately, better knowledge of the anatomy and pathology, combined with improved techniques in magnetic resonance imaging (MRI), have allowed the clinician to diagnose gluteus medius tears as an underlying source of GTPS.

Anatomy of Gluteal Tendon Insertions

To diagnose and treat tears of the gluteal tendons, it is essential to understand the precise anatomy of the tendon insertions, the bursae, and the bony facets of the greater trochanter (Fig 1). The gluteus minimus inserts on the anterior facet of the greater trochanter, and the gluteus medius has 3 attachment points. The thicker, main component of the gluteus medius tendon arises from the central posterior portion of the muscle and has a thick tendinous insertion on the superoposterior facet.11 The thin, broad, lateral component is mostly muscular in nature and arises from the undersurface of the muscle belly, attaching to the lateral facet of the trochanter.11 and 12 Finally, the gluteus medius insertion continues anteriorly to form the anterior attachment, which is not visible macroscopically.13

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Figure 1. Anatomy of greater trochanter with tendinous insertion sites and bursae. (A) Footprints of gluteus medius and minimus tendon insertions. (B) The 3 main bursae and their positions. (C) Geometry of greater trochanter with different facets.

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Gottschalk et al.,14 after evaluating the anatomic configuration of the glutei and performing an electromyographic study, found that the primary function of the gluteus minimus and posterior part of the gluteus medius is to stabilize the femoral head in the acetabulum during motion and gait. They also showed that the anterior and middle fibers of the gluteus medius have a vertical pull and help initiate abduction whereas the tensor fascia lata is the major abductor of the hip.

Each of the tendons is associated with its own bursa (Fig 1B). The subgluteus medius bursa covers the superior part of the lateral facet. It is bordered by the tip of the trochanter superiorly and the lateral facet anteriorly, and its posterior and inferior border is the tendinous insertion of the gluteus medius.11 The gluteus minimus is associated with a bursa in the area of the anterior facet. This bursa covers part of the hip joint capsule and in some situations communicates with the subgluteus medius bursa.11 and 12 The larger trochanteric or subgluteus maximus bursa is located beneath the gluteus maximus muscle and the iliotibial (IT) band, over the posterior and lateral facets of the greater trochanter and the distal-lateral aspect of the gluteus medius tendon.15 Pfirrmann et al.12 noted that this bursa does not extend over the anterior border of the lateral facet.

There is a paucity of information about the blood supply to the gluteus medius and minimus tendons. Studies in the literature mainly discuss blood supply to the trochanter,16 and 17 as well as its disruption by soft-tissue dissection and osteotomies.

Partial-Thickness Undersurface Tears of Gluteus Medius

The gluteus complex has often been compared with the rotator cuff of the shoulder.1118 and 19 Tears in the medius and minimus tendons, initially described by Bunker et al.18 and Kagan,19 have subsequently been the subject of multiple publications.38202122 and 23 Although the true prevalence of gluteus complex tears is unknown, gluteus medius tendon tears may occur in as many as 25% of late middle–aged women and 10% of men in the same age group.13 Whereas acute tears of the gluteal tendons may occur, it is believed that degenerative tears are more common.11 and 24 Gluteus medius tears occur more often than gluteus minimus tears.8 and 9 Tears at the insertion of the gluteus medius tendon can be intrasubstance, partial, or complete.18 Connell et al.9 showed that partial tears were far more common.

In our experience most partial-thickness tears encountered were undersurface tears. Because most of the pathology is covered by intact tendon, the tears may go unnoticed, because they are not directly visible through either an open or endoscopic approach (Fig 2).

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Figure 2. Partial undersurface tear of gluteus medius tendon. (A) Arthroscopic image through anterolateral portal of apparently intact gluteus medius tendon after bursectomy. Patient is in supine position. (B) Arthroscopic image through anterolateral portal of same tendon undersurface tear after longitudinal incision through superficial fibers. Patient is in supine position.

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A very clear analogy can be drawn between undersurface tears of the gluteus medius and partial-thickness articular-sided tears of the rotator cuff (Table 1). In both cases the tearing occurs on the deep side of the tendon and may not be visible from the superficial side of the tendon. Multiple techniques for repair of partial or intrasubstance shoulder rotator cuff tears have been described. Debridement of these tears did not provide adequate pain relief,25 and 26 so repair was attempted and initially involved completing the tears,2728 and 29which altered the normal footprint of the tendon. Trans-tendinous techniques for PASTA (partial articular supraspinatus tendon avulsion) repair were then introduced that involved debriding and resecting only the diseased portion of the tendon and repairing the tears to the normal footprint.30 and 31 Spencer32 also described an all-inside technique to treat partial articular-sided tears that do not violate the bursal surface.

Table 1. Similarities and Differences Between Shoulder and Hip Rotator Cuffs

Shoulder Rotator Cuff

Hip Rotator Cuff

Functional anatomy

Internal rotator



Stabilizers and rotators,
initiation and assistance in

Supraspinatus and infraspinatus

Gluteus medius and minimus



Tensor fascia lata

Clinical presentation

Pain with motion
Weakness in abduction

Tenderness over lateral aspect of hip
Weakness in abduction


Visualized on MRI and ultrasound

Visualized on MRI and ultrasound


Degenerative tearing
Acute trauma

Degenerative tearing
Acute trauma

Arthroscopic evaluation

Articular tears can be visualized as either exposed footprint or delamination

Undersurface tears cannot be easily visualized

Table options

Although gluteal tendon pathology may be very similar to partial-thickness articular tears of the rotator cuff of the shoulder, there is at least 1 important difference: the latter can be accessed from both the articular and bursal sides. In contrast, there is no space on the deep side of the gluteus medius analogous to the intra-articular space of the shoulder, from which the undersurface of the tendon can be visualized. Because of the lack of access to the deep side, trans-tendinous repairs of the gluteus medius cannot be performed in the same manner as a PASTA-style repair of the rotator cuff. The lack of access to the deep side poses a unique technical challenge in surgical treatment of undersurface gluteus medius tears.

Another instructive analogy may be drawn between undersurface gluteus medius tears and extensor carpi radialis brevis (ECRB) tears in lateral epicondylitis. ECRB tears generally occur through micro-tearing and subsequent degeneration of tendon tissue on its deep side.33 We have observed a similar phenomenon in the gluteus medius, where degenerative partial-thickness tearing occurs on the deep side of the tendon, near its bony insertion. Thornton et al.34 proposed a surgical procedure for treatment of partial-thickness undersurface tears of the ECRB. This procedure involves exposure of the deep fibers of the ECRB tendon through a longitudinal split, excision of the pathologic parts of the tendon near its insertion, decortication of the lateral epicondyle, and repair of the ECRB to the bone with suture anchors. This procedure had good to excellent results in all 22 patients who underwent the surgery.

Existing Techniques for Repair of Gluteus Medius

Open Techniques

Multiple procedures are described to help relieve refractory trochanteric bursitis including open bursectomy, IT band lengthening or release,35 and 36 and trochanteric reduction osteotomy,37 but there is very little in the literature describing specific open repair techniques for gluteus medius and minimus tendon ruptures. Davies et al.38 describe a technique using soft-tissue anchors in the greater trochanter to reattach torn abductors diagnosed by examination and MRI. They had 4 re-ruptures out of 16 repairs, and the patients with no postoperative complications had significant improvement in their pain. Bunker et al.18 used intraosseous sutures to repair the torn part of the tendon to decorticated bleeding bone with the rationale that simple repair of a tendon tear would be unlikely to heal.

Endoscopic Techniques

As with open techniques, multiple endoscopic procedures have been described to treat lateral-sided pain, including bursectomy,39 IT band release for external snapping hip syndrome,40 and 41 and debridement for treatment of calcific tendonitis of the gluteus medius and minimus.42

Voos et al.43 describe a technique to repair gluteus tendon tears that could be seen from the peritrochanteric compartment. Their technique involves debridement of the edges of the visualized tear and the attachment site on the trochanter. Suture anchors were placed in the footprint of the abductor tendons, with the help of fluoroscopic guidance, and used to repair the torn tendon to the bone. All ten patients who had this procedure had complete relief of their symptoms.43

As discussed previously, partial-thickness undersurface tears present a particular problem, because they are not visible by arthroscopic or open examination from the peritrochanteric space. These partial-thickness tears have been implicated in debilitating GTPS, and therefore the authors believe that a different approach to arthroscopic diagnosis and repair is indicated.

Our Preferred Technique: Trans-Tendinous Endoscopic Gluteus Medius Debridement and Repair

Based on our review of the anatomy of undersurface tears of the lateral facet insertion of the gluteus medius, we identified a need for access to the undersurface for debridement of pathologic tissue and repair to the lateral facet. To surmount this challenge, a novel technique was developed for trans-tendinous endoscopic gluteus medius debridement and repair. In the development of this technique, several goals of successful repair were considered (Table 2). The technique incorporates and builds upon previous work on trans-tendinous repairs of the rotator cuff of the shoulder and of the common extensor origin of the elbow. The purpose of this article is to describe the anatomic basis and surgical steps for the trans-tendinous endoscopic gluteus medius debridement and repair technique. Video clips of the technique are available for viewing at

Table 2. Goals and Potential Pitfalls of Trans-Tendinous Endoscopic Gluteus Medius Debridement and Repair

Technique Advantages

Potential Pitfalls

Minimal disruption of normal anatomy
Visualization of intrasubstance and undersurface tears
Secure repair of tears and debridement of pathologic tendon

Portal placement
Muscle injury
Difficulty passing and shuttling suture for repair
Incorrect anchor placement

Table options

Portal Placement

The 70° arthroscope is inserted into the peritrochanteric space through a mid-anterior portal. By aiming just inferior to the vastus ridge under fluoroscopic visualization, the surgeon avoids iatrogenic damage to the gluteus medius insertion (Fig 3). A shaver is then introduced through the anterolateral portal. Trochanteric bursectomy is performed, with care to keep the shaver blades away from the gluteus medius. When the decision is made to proceed with repair, posterolateral and distal peritrochanteric portals are created. These 2 portals are in line with the center of the trochanter, located 3 cm proximal and 3 cm distal, respectively, to the tip of the trochanter (Fig 4A).

Figure 3. Fluoroscopic anteroposterior view of right hip with cannula being aimed just inferior to vastus ridge for peritrochanteric compartment access.

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Figure 4. Arthroscopic images of repair technique. This is a right hip with the patient in the supine position. The pictures are taken with the arthroscope in the mid-anterior portal. (A) Portal placement. (MA, mid anterior; AL, anterolateral; PL, posterolateral; DPT, distal peritrochanteric.) (B) Debridement of undersurface tear of gluteus tendon. (C) Decortication of greater trochanter at footprint of gluteus tendon. (D) Anchor placement. (E) Suture passage through edges of tendon. (F) Approximation of tendon edges. (G) Final repair.

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Trans-Tendinous Approach and Debridement

The surgeon performs diagnostic endoscopic examination of the peritrochanteric space, visualizing and probing the gluteus medius, gluteus maximus, vastus lateralis, and IT band. A beaver blade is used to create a longitudinal split in the midsubstance of the lateral facet insertion of the gluteus medius. Through this split, the undersurface tearing and pathologic tendon tissue are visible. The arthroscope can be inserted through this split into the gluteus medius bursal space on the deep side of the gluteus medius tendon. From this perspective, the undersurface of the tendon can be viewed in its entirety (Fig 2B). The shaver is used to debride the pathologic tissue and to expose the lateral facet of the greater trochanter (Fig 4B). A bur is used to decorticate the lateral facet to create a bleeding bed of bone for healing of the repaired tendon (Fig 4C).

Trans-Tendinous Repair Technique

With the assistance of fluoroscopic guidance, a 5.5-mm Corkscrew anchor (Arthrex, Naples, FL) is placed through the tendon split in the distal part of the lateral facet footprint (Fig 4D). The Crescent SutureLasso or Birdbeak (Arthrex) is used to pass 1 limb of each suture through the anterior part of the tendon and 1 limb of each suture through the posterior part (Fig 4E). This is then repeated for a second anchor placed in the more proximal part of the lateral facet. All sutures are tied down by use of an arthroscopic knot-tying technique (Fig 4F). This technique results in a side-to-side repair of the longitudinal tendon split while firmly approximating the tendon to the footprint on the lateral facet (Fig 4G).


GTPS often responds well to conservative treatment, including anti-inflammatory medication, physical therapy, and steroid injection. In GTPS that is refractory to nonsurgical measures, underlying gluteus tendon injury should be considered. Bard44 proposed tendinopathy of the gluteus medius tendon as the chief source of this syndrome and cautioned against overuse of corticosteroid injections without actual firm diagnosis. Gluteus tendinopathy is often misdiagnosed as bursitis and not even regarded as a possible cause of lateral hip pain, as shown by a recent survey of orthopaedic surgeons performed in France.45 Increased awareness and better understanding of the pathophysiology of GTPS are key factors that will help the physician consider gluteus tendon tears as a potential reason for the patient’s symptoms.

The diagnosis of gluteus tendinopathy or rupture should initially be made clinically. Clinical examination includes palpation for tenderness, Trendelenburg testing,4 abduction strength testing, and resisted external rotation in supine (hip flexed 90°) and prone (hip extended) positions.46
MRI and ultrasound may be used for confirmation of the diagnosis. Blankenbaker et al.47 showed that findings of peritrochanteric inflammation on MRI might not necessarily correlate with actual disease. They evaluated MRI scans of 256 consecutive hips without any knowledge of clinical symptoms. After the data were collected, they found that all hips with trochanteric pain (16) had evidence of peritrochanteric abnormalities on MRI. However, of 240 asymptomatic hips, 212 (88%) had similar positive MRI findings. In contrast, 88% of hips with trochanteric symptoms had MRI findings consistent with gluteus tendinopathy, whereas only 50% of asymptomatic hips had such findings. Although these findings suggest that gluteus tendinopathy may be a more significant MRI finding than trochanteric bursitis, the high percentage of abnormal findings in asymptomatic patients underlines the importance of clinical evaluation.47

We present a novel technique to debride and repair gluteus tendinosis and partial tearing endoscopically (Fig 5 and Videos 1-4, available at To our knowledge, the only other endoscopic gluteus tendon repair technique, described by Voos et al.,43 involved tears that were either full thickness or at least grossly visible from the peritrochanteric space. By approaching the tendon through a longitudinal split in line with its fibers, we are able to visualize and treat intrasubstance and undersurface tears without affecting the integrity and strength of the tendon itself. Using anchors in a well-prepared bed of bone and putting the suture through the tear and the split allow for a secure repair.

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Figure 5. Schema of surgical repair technique in a right hip. Proximal is left, and distal is right. (A) Superficial view of intact gluteus tendon. (B) Cross-sectional view of intact gluteus tendon. (C) Superficial view of undersurface gluteus tendon tear. (D) Cross-sectional view of undersurface gluteus tendon tear (arrow). (E) Superficial view of longitudinal incision along gluteus tendon fibers. (F) Cross-sectional view of longitudinal incision along gluteus tendon fibers (arrow). (G) Superficial view of anchor placement and suture passage through tendon edges, after debridement of tear and decortication of bony bed. (H) Cross-sectional view of anchor placement and suture passage. (I) Superficial view of final repair of gluteus tendon. (J) Cross-sectional view of final repair of gluteus tendon.

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Often misdiagnosed as trochanteric bursitis, partial tears of the gluteus medius and minimus tendinous insertions onto the greater trochanter can be the source of chronic debilitating lateral hip pain. We present an endoscopic technique that allows visualization, debridement, and repair of these tears with minimal and fully repairable injury to the remaining intact tendon.

Supplementary data

Video 1.  Portal placement, bursectomy, and evaluation of gluteus tendon.
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Video 2.  Trans-tendinous approach, debridement, and preparation of bony bed with bur.
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Video 3.  Anchor placement.
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Video 4.  Suture passage and repair.
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Supplementary data.  
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B.G.D. has received from Arthrex, Naples, Florida, support exceeding US $500 related to this research. The other authors report no conflict of interest.