Understanding Periacetabular Osteotomy (PAO) Surgery for Hip Dysplasia

Hip dysplasia is a condition where the hip socket (acetabulum) does not fully cover the ball (femoral head) of the thigh bone (femur), causing instability and pain. For many patients, this can lead to early degenerative changes and limited mobility if left untreated. One surgical option for those patients with symptomatic hip dysplasia is Periacetabular Osteotomy (PAO). This procedure aims to correct the hip socket’s position, improving joint stability and function.

This is a specialized procedure performed by hip preservation experts like Atul Kamath, MD of Kamath Orthopedics. Dr. Kamath has undertaken multiple fellowships in training for PAO surgery, and has years of experience performing this unique surgery.

What Is Periacetabular Osteotomy (PAO) for Hip Dysplasia?

Periacetabular osteotomy (PAO) is a surgical technique designed to treat hip dysplasia by reshaping the hip socket (acetabulum). The surgeon cuts the bones around the acetabulum and repositions the socket to better cover the femoral head. This improves the stability of the hip joint and reduces abnormal wear on the cartilage.

Unlike hip replacement surgery, PAO preserves the patient’s natural hip joint. It is often recommended for younger patients who have hip dysplasia but do not yet have significant arthritis. The goal is to delay or prevent the need for a total hip replacement.

Who Is a Candidate for PAO Surgery?

Patients with hip dysplasia often experience pain, a feeling of instability, or a limp. PAO surgery is usually considered when:

• The patient is young or middle-aged (typically under 40 years old)

• Hip dysplasia causes significant symptoms affecting daily life

• X-rays show shallow or misaligned hip sockets without advanced arthritis

• Non-surgical treatments like physical therapy and oral pain medication have not provided relief

  
  

A thorough evaluation by an orthopedic surgeon includes physical exams, and imaging tests such as X-rays. Sometimes advanced imaging studies like an MRI or CT scan is used to aid diagnosis, and often used to plan potential surgery.

How Is the Surgery Performed?

PAO surgery involves several key steps:

1. Bone Cuts Around the Acetabulum

   The surgeon makes precise cuts around the hip socket without damaging the joint itself.

   
   

2. Repositioning the Socket

   The acetabulum is rotated and repositioned to provide better coverage of the femoral head.

   
   

3. Fixation

   The repositioned bone is secured usually with screws to hold it in place during healing.

   
   

4. Closure and Recovery

   The incision is closed, and the patient begins a carefully monitored rehabilitation program.

   
   

The surgery typically takes about 1-2 hours and requires anesthesia. Hospital stays usually last 1-2 nights, depending on the patient’s recovery progress.

What to Expect During Recovery

Recovery from PAO surgery is gradual and requires patience. Key points include:

• Initial Rest and Limited Weight Bearing

Patients often use crutches for 6 to 8 weeks to avoid putting full weight on the hip. The duration of protected weight-bearing may depend on the degree of deformity/ correction needed, quality of the bone, and other factors like age.

• Physical Therapy

A structured physical therapy program starts soon after surgery to restore range of motion and strengthen muscles.

• Pain Management

Pain and swelling are managed with medications and ice therapy.

• Return to Activities

Most patients can return to low-impact activities like walking, swimming, and biking within the first several months after surgery. High-impact sports may require longer recovery or modification.

Success depends on following the surgeon’s instructions and attending follow-up appointments.

Benefits and Risks of PAO Surgery

PAO surgery offers several benefits for patients with hip dysplasia:

• Improved hip stability and function

• Reduced pain and discomfort

• Delay or prevention of arthritis progression

• Preservation of the natural hip joint

  
  

However, like all surgeries, PAO carries risks such as:

• Rare complications like infection, blood clots, and nerve/ blood vessel injury

• Nonunion or delayed healing of the bone

• Persistent pain or need for further surgery

  
  

Discussing these risks with your surgeon helps set realistic expectations.

Real-Life Example

Consider a 28-year-old patient who struggled with hip pain and difficulty walking due to hip dysplasia. After undergoing PAO surgery, the patient reported significant pain relief and improved mobility within six months. Physical therapy helped regain strength, and the patient returned to daily activities without the instability experienced before surgery.

Final Thoughts on PAO Surgery for Hip Dysplasia

Periacetabular osteotomy offers a valuable option for patients with hip dysplasia who want to maintain their natural hip joint and improve quality of life. This is a specialized procedure performed by hip preservation experts like Atul Kamath, MD of Kamath Orthopedics, who has undertaken multiple fellowships in training for PAO surgery, and has years of experience. Understanding the procedure, recovery, and potential outcomes helps patients make informed decisions about their care.