Hip Osteoarthritis
The most likely diagnosis in an elderly woman with right groin pain worsening with stair climbing is hip osteoarthritis. This classic presentation—groin pain exacerbated by weight-bearing activities like climbing stairs—is the hallmark of intra-articular hip pathology 1.
Clinical Reasoning
Why Hip Osteoarthritis is Most Likely
The clinical presentation points directly to hip osteoarthritis based on several key features:
- Groin pain location: Anterior hip and groin pain is the cardinal symptom of intra-articular hip pathology 2, 3
- Activity-related worsening: Pain that increases with weight-bearing activities (stair climbing) and improves with rest is characteristic of degenerative joint disease 1
- Elderly demographic: Hip osteoarthritis is extremely common in this population—approximately 1 in 4 persons develop symptomatic hip arthritis before age 85 3
The 2025 AAOS guidelines 1 present an identical case: an 83-year-old woman with right groin and lateral hip pain exacerbated by activity, alleviated by rest, without antecedent trauma—ultimately diagnosed with end-stage hip degenerative joint disease.
Key Diagnostic Features to Assess
On physical examination, look for:
- Antalgic gait (limping to reduce weight-bearing on affected side)
- Pain with internal rotation of the hip—this reproduces intra-articular symptoms
- Limited range of motion, particularly internal rotation and flexion
- Groin tenderness rather than lateral hip or buttock pain
Differential Considerations
While hip osteoarthritis is most likely, other causes of groin pain in elderly patients include:
- Hip labral tears: Also cause groin pain but more common in younger, athletic populations 2
- Pubic symphysis fractures: Can present with groin pain mimicking hip pathology, especially in patients with osteoporosis or on steroids 4, but typically follow trauma
- Iliopsoas tendon rupture: Rare cause of atraumatic groin pain, particularly in anticoagulated patients 5
- Referred pain: From lumbar spine or sacroiliac joint 6, 2
Diagnostic Approach
Initial Imaging
Plain radiographs are the essential first step 6:
- Anteroposterior (AP) view of the pelvis
- Frog-leg lateral view of the symptomatic hip
These radiographs will typically show:
- Joint space narrowing
- Osteophyte formation
- Subchondral sclerosis
- Subchondral cysts
In many instances, such as osteoarthritis, plain radiographs may be the only imaging necessary 6.
Advanced Imaging
MRI should only be pursued if:
- Plain radiographs are non-diagnostic
- History suggests alternative pathology (labral tear, osteonecrosis, occult fracture) 2
- Surgical planning requires detailed soft tissue assessment
Management Implications
Conservative Treatment (Initial Approach)
Based on high-quality evidence from AAOS guidelines 1:
- NSAIDs (strong recommendation): When not contraindicated, oral NSAIDs should be used for symptomatic hip OA
- Acetaminophen (consensus option): May be considered when not contraindicated
- Physical therapy (moderate recommendation): Should be considered for mild-to-moderate symptomatic hip OA
Surgical Consideration
If conservative measures fail and radiographs show advanced degenerative changes, total hip arthroplasty (THA) becomes the definitive treatment for preserving mobility and quality of life 1, 7, 8.
Common Pitfalls to Avoid
- Don't assume all groin pain is muscular or hernia-related: The groin pain-hip arthritis connection is frequently missed initially 8
- Don't skip plain radiographs: They remain the gold standard initial test and are often diagnostic 6
- Don't overlook medication history: Anticoagulation or chronic steroid use increases risk of alternative diagnoses like spontaneous tendon rupture or pubic fractures 4, 5
- Don't ignore the spine and knee: These can refer pain to the groin region 6, 2