Right hip pain associated with a positive Trendelenburg test usually points to hip abductor dysfunction on the stance side (the side you stand on during the test), most often:
Gluteus medius/minimus tendinopathy or tear (very common)
Superior gluteal nerve weakness/injury
Hip joint pathology causing pain-inhibited abductor weakness (OA, inflammation)
Less commonly: structural causes (coxa vara, post-THA abductor insufficiency)
How to interpret your finding
In Trendelenburg, if standing on the right leg causes the pelvis to drop on the left, that is a positive right Trendelenburg and suggests right abductor insufficiency.
If your main symptom is lateral hip pain, think greater trochanteric pain syndrome (often gluteal tendinopathy ± trochanteric bursitis).
Helpful next exam steps
Palpation over greater trochanter
Single-leg stance pain reproduction
Resisted hip abduction strength test
Check gait for Trendelenburg lurch
When to get imaging
Persistent pain >6 to 12 weeks, marked weakness, or failed conservative treatment:
X-ray first (OA, bony causes)
Ultrasound or MRI for gluteal tendon tear/tendinopathy
Initial management (typical)
Activity modification (avoid prolonged single-leg loading, side-lying on painful side)
Hip abductor strengthening, pelvic stability PT
NSAIDs/topical NSAIDs if appropriate
Consider guided injection in selected cases
Tendon tears with significant weakness may need orthopedic referral
If you want, I can help you narrow this to the most likely cause based on where exactly the pain is (groin vs lateral vs buttock), age, gait pattern, and any trauma history.
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