What Is Arthrotomy? Procedure, Reasons, and Recovery

Arthrotomy is the surgical opening of a joint. A surgeon makes an incision through the skin, underlying tissue, and the joint capsule itself to directly access the interior of a joint for diagnosis, treatment, or repair. It is one of the oldest approaches to joint surgery, dating back to at least the late 1800s, and remains a core technique even as less invasive alternatives have gained popularity. Whether you are facing this procedure yourself or simply want to understand what it involves, the reality of arthrotomy is more nuanced than “just cutting open a joint,” and the reasons surgeons still choose it over smaller-incision methods are worth understanding.

How Arthrotomy Differs From Arthroscopy

The most common point of confusion is the difference between arthrotomy and arthroscopy. Both involve accessing the inside of a joint, but the approach is fundamentally different. Arthroscopy uses small puncture-sized incisions and a camera (arthroscope) to visualize and work inside the joint. Arthrotomy uses a larger, open incision that gives the surgeon a direct line of sight and full manual access. Think of arthroscopy as looking through a keyhole with a flashlight and long-handled tools, while arthrotomy is opening the door and stepping inside.

This distinction matters because it drives most of the trade-offs patients care about. Arthroscopy generally means a smaller scar, less tissue disruption, and a faster initial recovery. Arthrotomy gives the surgeon a wider visual field, the ability to handle larger or more complex pathology, and direct tactile feedback. In many situations, the choice between the two is not about one being “better” but about which fits the clinical problem. A straightforward joint infection in a knee might be handled arthroscopically, while a complex fracture extending into the joint surface, a large tumor, or a situation where extensive debridement is needed may demand the full access that only an open approach provides.

Why Surgeons Perform Arthrotomy

Arthrotomy is not a single operation but rather an approach that enables many different operations. The specific reasons a surgeon opens a joint vary widely, but several common indications account for most cases.

Joint infection: Septic arthritis, where bacteria invade a joint, is one of the most frequent reasons. The joint needs to be opened, irrigated with sterile fluid, and debrided (cleaned of infected tissue) to prevent permanent cartilage destruction. This is sometimes called irrigation and debridement, or I&D.
Fracture repair: When a bone breaks in a way that extends into the joint surface (an intra-articular fracture), the surgeon often needs to open the joint to realign the fragments precisely and fix them with screws or plates.
Removal of loose bodies: Pieces of cartilage or bone that have broken free and are floating inside the joint can cause locking, pain, and further damage. If they are too large or too numerous for arthroscopic retrieval, arthrotomy is the route.
Tumor biopsy or excision: Masses found within or around a joint may require open access for adequate biopsy or complete removal. In one reported case, a rare synovial sarcoma was discovered inside a knee during joint replacement surgery; the patient ultimately underwent wide excision through an open approach and was disease-free eight years later.¹
Capsular release: When a joint becomes severely stiff (arthrofibrosis), particularly after prior surgery or trauma, the surgeon may need to cut through scar tissue within the joint capsule. Arthroscopic release is often tried first, but open release remains an option when the stiffness is extensive.²
Joint replacement: Total knee and hip replacements are, technically, arthrotomies. The joint is opened to remove damaged surfaces and implant prosthetic components.

In newborns, septic arthritis is a particularly urgent scenario. Neonates who do not respond to antibiotics alone may require emergency arthrotomy and lavage of the infected joint to prevent lasting damage to developing bones and cartilage. Early intervention in these cases can dramatically reduce the risk of long-term disability.³

A Brief History

Arthrotomy has deeper roots than most people realize. The concept was introduced around 1889 by a surgeon named Lockwood at a London medical society, who argued that opening a joint could relieve pain from certain conditions. The idea was controversial at the time because surgical hygiene was still poor, and infection rates were high. Proponents pushed back, with one early surgeon publishing a personal review of 22 successful knee arthrotomies performed to treat infection and improve mobility. As operating room cleanliness improved toward the turn of the century, arthrotomy became more widely accepted. One of its unintended contributions to medicine was that by opening knees routinely, surgeons could finally see and study structures like the meniscus up close, launching an era of research into cartilage and joint anatomy that continues today.⁴

What Happens During the Procedure

The specifics of an arthrotomy vary by joint and by the problem being addressed, but the general sequence follows a predictable pattern. Before surgery, you undergo a preoperative evaluation that focuses on your overall health, any risk factors for heart or lung complications, and what medications you take. Lab work is ordered based on your medical status rather than as a blanket routine.⁵ Imaging, typically X-rays and sometimes an MRI or CT scan, helps the surgeon plan the incision and approach. Intraoperative imaging such as fluoroscopy (real-time X-ray) is sometimes used during the procedure to confirm the position of bones, implants, or hardware.

Anesthesia can be general (you are fully asleep), regional (a nerve block or spinal anesthetic that numbs the area), or a combination. The choice depends on the joint involved, the expected length of surgery, and your health. For knee arthrotomies, spinal or epidural anesthesia with sedation is common. For smaller joints like the wrist or ankle, a regional nerve block may be sufficient.

Once anesthesia takes effect, the surgeon makes the incision. For a knee, this is often a midline or parapatellar incision, meaning it runs along the front of the knee beside the kneecap. The layers of tissue are divided one by one until the joint capsule is reached and opened. A tourniquet is frequently used on the upper thigh to reduce bleeding and improve visibility, though its use has implications for nerve function that we will get to later. Inside the joint, the surgeon performs whatever procedure is needed: washing out infection, repairing a fracture, removing loose bodies, excising a mass, or releasing scar tissue. After the work is done, the joint is irrigated, and closure happens in layers. Some surgeons place a drain to prevent blood from pooling inside the joint; others skip it. Research on knee replacement has found that postoperative blood collections (hematomas) were associated with a higher rate of subsequent joint infection, suggesting there is value in managing fluid accumulation, whether through drainage or other means.⁶

Recovery After Arthrotomy

Recovery timelines depend heavily on why the arthrotomy was performed. A simple washout for a joint infection follows a different trajectory than a total knee replacement or a complex fracture repair. That said, some experiences are common across most arthrotomies.

Pain after surgery is significant in the early days but tends to improve quickly with appropriate treatment. In a study of patients who underwent arthrotomy for infected knees, pain scores dropped from about 8 out of 10 before surgery to roughly half that level by four weeks, and down to about 1 out of 10 by six months. The researchers attributed the rapid early improvement to effective cleaning of the joint combined with targeted antibiotics, with physical therapy sustaining further gains.⁷ Your pain management plan will likely include a combination of medications, ice, and elevation in the first days.

The bigger challenge for most patients is regaining strength and range of motion. In the first days after a knee arthrotomy, muscle weakness and gait problems are nearly universal. Research using detailed muscle testing found that one month after knee arthrotomy, the strength of the muscles that straighten the knee (quadriceps) averaged about half of normal, while the muscles that bend the knee (hamstrings) and overall range of motion were about three-quarters of normal.⁸ That same study found that over half of the patients who underwent additional nerve testing had developed temporary nerve irritation in the thigh (femoral neuropathy), likely related to tourniquet use during surgery. Patients with this nerve irritation recovered more slowly and scored lower on functional measures. The takeaway here is that weakness after arthrotomy is expected, but if your recovery seems unusually slow, nerve involvement is a real possibility worth discussing with your surgeon.

Physical therapy typically begins within a day or two of surgery, starting with gentle range-of-motion exercises and progressing to strengthening work. The timeline for returning to normal activities ranges from a few weeks for minor procedures to several months for major reconstructions or joint replacements.

Arthrotomy Versus Arthroscopy for Joint Infections

Because septic arthritis is one of the most common reasons for both arthrotomy and arthroscopy, researchers have studied the comparison closely. The evidence is extensive, and the picture is consistent across multiple reviews, though the conclusions are more measured than you might expect.

For the knee, arthroscopic washout appears to offer some advantages. A systematic review and meta-analysis found that arthroscopy was associated with a lower risk of re-infection, fewer complications, and a shorter hospital stay, though the differences in hospital time were modest (roughly half a day to one day shorter).⁹ Another analysis looking at 90-day outcomes found no difference in reoperation rates between the two approaches but noted that open arthrotomy patients had higher odds of hospital readmission, postoperative anemia, and blood transfusion.¹⁰ A separate network meta-analysis similarly found that arthroscopic lavage had better clinical success and fewer complications than open arthrotomy for knee infections.¹¹

However, researchers have consistently flagged an important caveat: open arthrotomy tends to be used for more severe infections. Patients who get the open procedure often have worse disease at baseline, which makes a clean comparison difficult. One systematic review concluded that while arthroscopy produced favorable range of motion and a tendency for lower reoperation rates, there is no evidence that open arthrotomy should be abandoned, particularly when arthroscopic treatment is unavailable or when disease severity warrants it.¹²

The picture is not the same for every joint. In the wrist, a large analysis of over 1,000 cases found the opposite pattern: patients treated arthroscopically had much higher reoperation rates (about 49%) compared to those treated with open arthrotomy (about 9%), though complication rates were similar between the two groups.¹³ This is a striking reversal from the knee data and illustrates that the “arthroscopy is always better” narrative oversimplifies reality. Joint anatomy, the technical demands of working in a small space, and the nature of the pathology all factor into which approach works best.

For the ankle, open arthrotomy has been associated with higher rates of surgical-site infection and hospital readmission compared with arthroscopy, though reoperation rates were similar.¹⁴

Risks and Complications

Every surgery carries risk, and arthrotomy is no exception. The specific risks depend on the joint, the underlying condition, and the patient’s health, but a cohort-matched comparison for septic knee arthritis offers some concrete numbers. Major complications, including events like blood clots, pulmonary embolism, pneumonia, and deep infection, occurred in roughly 5% of arthrotomy patients versus about 4% of arthroscopy patients, a difference that was not statistically significant. Minor complications, such as superficial infection and nerve irritation, occurred in about 14% of arthrotomy patients and 13% of arthroscopy patients, again without a meaningful difference.¹⁵ So while the overall complication rates are not dramatically different between the two approaches in matched populations, the larger incision of arthrotomy does tend to produce more wound-related issues.

Stiffness after surgery (arthrofibrosis) is a particularly frustrating complication that can follow any knee surgery, including arthrotomy. When the joint capsule and surrounding tissues form excessive scar tissue, the result is restricted motion that may require additional treatment ranging from aggressive physical therapy to a second operation.² Other risks include bleeding, blood clots in the legs, nerve damage (as discussed in the recovery section), and the usual risks associated with anesthesia.

Joint Replacement as Arthrotomy

It is worth noting that the most commonly performed arthrotomy in the world is total knee replacement. Every time a surgeon replaces a knee, they are performing an arthrotomy as the first step: opening the joint capsule to access the worn-out surfaces. Within that category, surgeons have developed several different approaches to opening the knee, some of which try to minimize the extent of the arthrotomy itself. Techniques that avoid cutting through the quadriceps tendon (called subvastus and midvastus approaches) are designed to preserve the muscle that straightens the knee, which can speed up early recovery. These minimally invasive approaches seem to offer advantages in the immediate postoperative period, though they have also been associated with increased reports of complications during surgery, possibly because the smaller working space makes the operation technically more demanding.

Scarring and Patient Expectations

One of the most common concerns patients raise before arthrotomy is the scar. Because the incision is larger than what arthroscopy requires, the resulting scar is naturally more visible. How much this matters varies from person to person, but orthopedic research suggests that for most joint surgery patients, the cosmetic appearance of the scar ranks surprisingly low among their concerns. Patients tend to prioritize restoration of function and pain relief. Scars that restrict joint movement are more worrying to orthopedic patients than scars that are merely visible, which makes sense when you consider that the whole point of the surgery is to get a joint working again.¹⁶

That said, scar management is still worth thinking about. Keeping the incision clean and dry during healing, following your surgeon’s wound care instructions, and starting gentle scar massage once the wound is fully closed can all help. If a scar does become thick, raised, or tight enough to limit movement, treatments including silicone sheeting, steroid injections, and revision surgery are available.

Arthrotomy in Veterinary Medicine

If you have a dog with a torn cruciate ligament, you might encounter the term arthrotomy in a veterinary context too. The same open-versus-scope debate plays out in animal medicine. A study comparing arthroscopic and open approaches for cruciate ligament surgery in dogs found that short-term postoperative morbidity was reduced in dogs that received the arthroscopic approach combined with a limited incision for stabilization, compared to those that had a traditional open arthrotomy.¹⁷ The parallels with human medicine are clear: less tissue disruption generally means faster initial recovery, but the open approach remains necessary when the situation demands it. In many veterinary practices, arthrotomy is still the standard because arthroscopic equipment and expertise are less widely available than in human hospitals.