Modern Study Review (AI-Generated)
High-Yield Summary
Osteotomies remain a vital joint-preserving strategy in managing select cases of avascular necrosis (AVN) of the femoral head and acetabular dysplasia. Intertrochanteric osteotomies aim to offload the necrotic segment by reorienting the femoral head, delaying or preventing arthroplasty. Periacetabular osteotomies (PAO), particularly the Bernese technique, optimize acetabular coverage while preserving blood supply, improving outcomes in hip dysplasia and early osteoarthritis.
Key Diagnostic Findings
| Aspect | Details |
|---|---|
| Anatomy | Femoral head and neck (intertrochanteric region); acetabulum and periacetabular region |
| Clinical Presentation | Hip pain, limited range of motion, mechanical symptoms, early osteoarthritis signs |
| Imaging | X-rays (Ficat staging for AVN, acetabular coverage angles), MRI (early AVN detection, cartilage status) |
| Classification Systems | Ficat Classification for AVN (Stage III = subchondral collapse); Bernese PAO technique for dysplasia |
Current Gold Standard Treatment
| Condition | Non-Operative Indications | Operative Indications & Techniques |
|---|---|---|
| AVN of Femoral Head (Ficat III) | Limited weight bearing, pharmacologic adjuncts (bisphosphonates, statins) | Intertrochanteric osteotomy (valgus or varus) to shift necrotic zone out of weightbearing area; vascularized fibular graft as alternative |
| Acetabular Dysplasia / Early OA | Activity modification, NSAIDs, physical therapy | Bernese periacetabular osteotomy (PAO) preserving blood supply; capsulotomy allowed due to preserved vascularity |
Modern Complications & Outcomes
| Complication | Notes |
|---|---|
| Intertrochanteric Osteotomy | Nonunion, malunion, persistent pain, progression to collapse requiring THA |
| Bernese PAO | Neurovascular injury (lateral femoral cutaneous nerve), heterotopic ossification, fragment nonunion |
| Outcomes | Both osteotomy and vascularized fibular graft show comparable mid-term hip preservation in Ficat III AVN; PAO improves pain and function with durable correction of dysplasia |
Classic Clinical Notes
Osteotomies2
Intertrochanteric Osteotomy for AVN
- Either a valgus flexion osteotomy or a varus osteotomy
- Basically, you do whatever is necessary to get the collapsed part of the head (Ficat III) out of the weightbearing zone.
- The results of osteotomy versus vascularized fibular graft for Ficat III are pretty similar.
Pelvic Osteotomy
- For periacetabular osteotomies, the acetabular fragment does rely at least to some degree on the capsule for its blood supply.
- The advantage of the Bernese osteotomy over other periacetabular osteotomies is that the ischium is not dissected out completely, so that the blood supply to the acetabulum is felt to be more intact, supplemented by branches of the inferior gluteal artery.
- You can therefore do a capsulotomy and deal with the intraarticular pathology without worrying as much about the blood supply to the acetabular fragment.
- Eg. Don’t do a capsulotomy after performing a spherical osteotomy.
Thoughts….
Good review of basic principles – use in conjunction with Don’s notes from Rounds.
Last Updated on January 24, 2026 by orthonet
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