Orthopedic surgery is performed to repair damaged bones, joints, ligaments, and tendons when the body can’t heal on its own or when non-surgical treatments stop working. The reasons fall into two broad categories: planned procedures for chronic conditions like arthritis that gradually destroys a joint, and emergency operations for traumatic injuries like fractures that need immediate stabilization.
Chronic Joint Pain That No Longer Responds to Treatment
The most common path to orthopedic surgery is a long one. It typically starts with months or years of conservative treatment: anti-inflammatory medications, physical therapy, activity changes, and steroid injections. Steroid injections, for example, can reduce inflammation and pain in a damaged shoulder or knee, but studies show their benefits may fade after just one week and show no measurable effect beyond about six months. When that cycle of temporary relief and returning pain repeats enough times, surgery enters the conversation.
Osteoarthritis is the condition behind many of these surgeries. As cartilage wears away, bone grinds against bone, causing stiffness, swelling, and pain that eventually limits everyday activities like walking, climbing stairs, or getting out of a chair. There’s no firm universal rule for when surgery becomes the right call, but most surgeons look for a combination of factors: imaging that shows significant joint damage, pain that persists despite several rounds of conservative treatment, and meaningful loss of function that affects your daily life.
A Cochrane review comparing total knee replacement plus a 12-week rehabilitation program against rehabilitation alone found that surgery may reduce pain at one year at a level that represents a real clinical benefit. Physical function also improved, though that improvement was smaller and may not cross the threshold of meaningful benefit for every patient. Notably, overall quality of life showed no significant difference between the two groups. This is why surgery is generally reserved for people whose pain is severe and persistent, not for mild or moderate cases where physical therapy can still make a difference.
Traumatic Injuries That Need Immediate Repair
Not all orthopedic surgeries are planned. Broken bones, dislocated joints, torn ligaments, and crushed vertebrae can all require emergency surgical intervention. The goal in these cases is stabilization: getting the damaged structures back into position so the body can begin healing.
Pelvic fractures in trauma patients are a clear example. Initial stabilization of the pelvic ring is critical, often starting with a pelvic binder at the scene before a patient even reaches the hospital. If bleeding continues despite resuscitation and external compression, surgeons may need to operate immediately to control hemorrhage and fix the fractured bone. Unstable spinal fractures follow a similar urgency. A staged approach is common: surgeons perform an initial reduction and stabilization within the first 24 hours, then complete the full repair within 72 hours once the patient is more stable.
Lower extremity fractures (broken legs, ankles, or feet) that are displaced, open, or involve a joint surface almost always require surgical fixation with plates, screws, or rods. Without surgery, these fractures would heal in the wrong position, leaving permanent deformity and loss of function.
What Surgery Physically Corrects
Orthopedic surgery works by restoring the mechanical alignment and structural integrity that injury or disease has disrupted. In a healthy knee, for instance, your body weight is distributed evenly across the joint surface. Arthritis destroys that balance, concentrating force on damaged areas and accelerating the breakdown.
A total knee replacement removes the damaged surfaces and caps them with artificial components. The traditional approach, used since the 1970s, aligns these components perpendicular to the leg’s mechanical axis, creating a neutral, balanced load across the joint. This reduces wear on the artificial surfaces and helps the implant last longer. A newer approach, introduced in 2008, instead tries to match the implant to your knee’s original anatomy, restoring more natural movement patterns. Biomechanical analysis shows this method produces larger contact areas between the implant surfaces, which spreads force more evenly and reduces pressure on the plastic liner between the metal components. Both approaches have trade-offs, and the choice often depends on your anatomy and your surgeon’s experience.
How Long Joint Replacements Last
Implant longevity is one of the biggest factors in the decision to operate, especially for younger patients. A systematic review and meta-analysis drawing on national registry data found that 93% of total knee replacements are still functioning at 15 years, 90% at 20 years, and 82% at 25 years. Case series data, which tends to come from specialized centers, reports even higher numbers: about 96% survival at 15 years and 95% at 20 years.
These numbers matter because if you’re 55 and get a knee replacement, there’s a reasonable chance you’ll need a revision surgery in your lifetime. If you’re 70, the odds are strongly in your favor that the implant will outlast you. This is one reason surgeons often encourage younger patients to exhaust every non-surgical option before committing to a replacement.
How Common These Surgeries Are
Orthopedic surgery is among the most frequently performed types of surgery worldwide. Across OECD countries, the average rate is 198 hip replacements and 156 knee replacements per 100,000 people. Germany, Switzerland, Australia, Finland, and Denmark have some of the highest rates. Volumes dipped sharply during the pandemic, leading to longer waiting lists, but by 2023 most countries had returned to pre-pandemic levels.
Risks to Weigh
Surgical site infection is the most closely tracked complication. A five-year analysis found an overall infection rate of about 2.5% in orthopedic procedures, which falls at the low end of the worldwide range of roughly 2.6% to 42%. That enormous range reflects differences in surgical setting, patient health, and the complexity of the procedure. Clean elective surgeries like a planned hip replacement carry much lower infection risk than emergency operations on open fractures contaminated with dirt or debris.
Blood clots are another well-known risk. Modern protocols using blood thinners and early mobilization (getting you walking the same day or the day after surgery) have significantly reduced this danger, but it remains a consideration, particularly for lower extremity procedures where blood flow slows during recovery.
What Recovery Looks Like
Recovery timelines vary widely depending on the procedure. For a primary joint replacement, most patients are encouraged to stand and walk with a walker or crutches the same day or the next day after surgery. The first one to two weeks are typically the most painful. At the two-week mark, you’ll have a follow-up appointment to check that the incision is healing properly.
For knee procedures, physical therapy usually begins about two weeks after surgery. The progression follows a predictable path: walker to crutch, crutch to cane, cane to walking unassisted. Most people feel comfortable returning to work and lighter daily activities within three to six months, though full recovery can take up to 12 months.
Hip procedures follow a slightly different timeline. At six to eight weeks, you’re typically about 20% recovered and able to put more weight on the joint. Return to work and daily activities generally falls between three and six months. Full recovery, especially when the surgery involved cutting bone or reattaching muscles and tendons, can take 12 to 18 months. Revision surgeries (replacing a worn-out implant with a new one) take considerably longer to recover from than the original procedure.