What Happens During Hip Replacement Surgery: A Step-by-Step Explanation

Understanding the Hip Replacement Procedure

• 🎯 The hip replacement surgery involves three main stages: the approach, the surgical part, and closure.
• 💡 The approach refers to how the surgeon accesses the hip joint, with common methods including anterior, posterior, and lateral approaches, each with slight short-term differences but similar long-term outcomes.
• ⚠️ Surgeons typically choose the approach they are most comfortable with, and patients are advised to trust their surgeon's expertise in this regard.

Surgical Steps: Replacing the Hip Joint

• 🦴 The first step after the approach is to dislocate the hip joint and surgically remove the femoral head (the "ball") from the acetabulum (the "socket").
• 🛠️ The acetabulum is prepared by reaming away cartilage to expose "bleeding bone," which is crucial for bone growth into the implant.
• ⚙️ A metal cup is then implanted into the acetabulum, which can be either cemented or, more commonly, uncemented, allowing bone to grow onto or into it.
• 🩺 Following the socket, the femoral canal is prepared to receive the femoral stem, which is also typically implanted uncemented in North America, though cementing is an option for older patients with wider femurs.

Implant Components and Final Steps

• 🌟 The bearing surface (liner) is inserted into the metal cup, most commonly made of high-density polyethylene (plastic) or ceramic; metal-on-metal bearings are largely avoided due to past complications.
• 🔩 A femoral head (made of metal or ceramic) is then placed onto the trunion of the femoral stem.
• ✅ Trial components are used to ensure proper stability, range of motion, and leg length restoration before the final implants are inserted.
• 🩹 After the hip joint is reduced (the ball is back in the socket), the surgical site is closed by rejoining the tissues, muscles, and skin.

Procedure Duration and Considerations

• ⏱️ An average hip replacement surgery typically takes about an hour, though this can vary based on complexity.
• 📏 Surgeons have a range of implant sizes available, and the bone preparation process guides the selection of the correct size for each patient.
• 🩺 While the procedure is highly successful, it is a surgical intervention with associated risks, which are discussed in other related content.