Management of High-Grade Partial-Thickness Insertional Gluteus Minimus Tear
For a high-grade partial-thickness insertional tear of the gluteus minimus that has failed conservative management, endoscopic repair using knotless suture anchors is the recommended surgical approach, as it effectively addresses the undersurface tear while minimizing surgical morbidity.
Initial Diagnostic Confirmation
MRI without contrast is the gold standard imaging modality for confirming gluteus minimus tears 1. MRI demonstrates sensitivity ranging from 33% to 100% and specificity of 92% to 100% for detecting gluteus medius/minimus tendon tears when correlated with intraoperative findings 1. Ultrasound is insufficient for surgical planning, detecting only a fraction of these injuries compared to MRI 1.
Treatment Algorithm
Conservative Management First
- Initial trial of non-operative care is indicated
- If persistent lateral hip pain, abductor weakness, and functional impairment continue despite conservative measures, proceed to surgical intervention 2
Surgical Approach for Partial-Thickness Tears
Endoscopic repair is the preferred technique for partial-thickness insertional tears 3, 2. The specific advantages include:
- Tissue-sparing approach: Modern techniques access the undersurface tear without splitting the bursal side of the tendon 3, 4
- Knotless anchor configuration: All-suture knotless anchors in an "X-linked" compressive configuration avoid knot stacks that can cause postoperative irritation 3
- Reduced surgical morbidity: Endoscopic techniques demonstrate fewer complications compared to open approaches 5
Technical Considerations
The surgical repair involves:
- Identification of the interval between gluteus medius and minimus tendons 4
- Direct visualization and debridement of the torn undersurface 2
- Preparation of the greater trochanter footprint 2
- Anchor placement for tendon reattachment using single- or double-row configuration depending on tear size 4
When to Consider Open Repair
Open repair may be superior for 5:
- Retracted full-thickness tears (not applicable to your partial-thickness scenario)
- High-grade fatty atrophy of the abductor musculature
- Tears requiring tendon mobilization or allograft augmentation
Important Clinical Pitfalls
Do not dismiss this as simple "trochanteric bursitis" 6. Partial-thickness undersurface abductor tears require actual tendon repair, not just bursectomy or debridement. This represents a paradigm shift from traditional treatment approaches 6.
Assess for concomitant intra-articular pathology 2. The endoscopic approach allows simultaneous treatment of hip joint pathology that may contribute to symptoms.
Evaluate for prognostic factors: Tendon calcification and increased vascularity on imaging predict worse pain outcomes 7, though these findings support the need for surgical intervention rather than contraindicate it.
Expected Outcomes
Endoscopic repair of partial-thickness gluteal tears demonstrates: