The Sauvé-Kapandji procedure is a surgical operation that fuses the joint where the radius and ulna meet near the wrist while deliberately creating a gap in the ulna bone a short distance above the fusion site. That gap, called a pseudoarthrosis, acts as a new pivot point that allows the forearm to rotate. The result is a stable wrist with preserved or improved ability to turn the palm up and down, which makes the procedure a go-to option for people with painful, damaged, or unstable distal radioulnar joints that have not responded to other treatments. The operation sounds paradoxical at first: how can fusing a joint and cutting a bone give you more motion? The answer lies in its clever redistribution of where forearm rotation actually happens.
What the Procedure Actually Does
Your forearm has two long bones, the radius and the ulna, which meet at both the elbow and the wrist. The joint at the wrist end, the distal radioulnar joint (DRUJ), lets you rotate your forearm so your palm faces up (supination) or down (pronation). When arthritis, old fractures, or ligament damage wrecks this joint, the simple act of turning a doorknob or pouring a glass of water can become painful and difficult.
The Sauvé-Kapandji procedure tackles this in two steps performed together. First, the surgeon fuses the distal ulna to the radius at the DRUJ, locking that damaged joint permanently in place. Second, a segment of bone is removed from the ulna shaft just above the fusion, creating a controlled gap. Because the ulna is now in two pieces connected by soft tissue rather than solid bone, the forearm can still rotate through this new gap. Meanwhile, the fused joint holds the ulnar head firmly in position, preserving the structural support that the wrist’s ligaments depend on.1PubMed Central. The sauvé-kapandji procedure
Who Is a Candidate
The procedure is used for a range of conditions that damage the DRUJ beyond what conservative treatment or simpler surgeries can fix. Post-traumatic arthritis from a badly healed wrist fracture is one of the most common reasons. Rheumatoid arthritis, which can gradually erode the joint surfaces, is another. Some people develop instability after ligament injuries, and others have congenital conditions that distort the joint’s anatomy.
A less common but well-documented application is Madelung deformity, a developmental condition in which the radius grows abnormally, leaving the ulna too long relative to the radius and forcing the DRUJ into a painful, dysfunctional position. In a series of young patients with this condition, the procedure eliminated pain and improved grip strength with very few complications.2PubMed. Surgical treatment of Madelung disease by the Sauvé-Kapandji technique
Age alone is not a deciding factor. The operation has been performed in teenagers with congenital problems and in older adults with longstanding arthritis. The more important question is whether the patient has enough healthy soft tissue around the ulnar stump to keep it stable after surgery, since the gap created in the ulna needs surrounding muscles and tendons to prevent the stump from wobbling painfully.
How It Compares to the Darrach Procedure
The most common alternative is the Darrach procedure, which simply removes the end of the ulna entirely. The Darrach is a simpler, faster operation, and it relieves pain well. But removing the ulnar head also removes the bony buttress that keeps the wrist’s carpal bones from drifting toward the ulnar side. Over time, this can lead to weakened grip and a tendency for the remaining ulnar stump to shift and cause clicking or discomfort.
The Sauvé-Kapandji procedure preserves the ulnar head and the ligaments attached to it, which is the key structural difference. A study comparing the two operations in patients with rheumatoid arthritis found that while both reduced pain and improved forearm rotation, the Sauvé-Kapandji was better at preventing the carpal bones from migrating and at improving grip strength.3PubMed. Comparison of the Sauvé-Kapandji procedure and the Darrach procedure for the treatment of rheumatoid wrists
A meta-analysis looking across multiple studies reinforced this picture. Both procedures improved forearm rotation significantly, and similar proportions of patients became pain-free. But grip strength improved significantly after the Sauvé-Kapandji procedure and did not improve after the Darrach. Patients who underwent the Sauvé-Kapandji were also significantly more likely to return to work.4PubMed Central. Darrach vs. Sauve-Kapandji: A Comprehensive Meta-Analysis of Surgical Outcomes in Distal Radioulnar Joint (DRUJ) Dysfunction
That said, the comparison is not entirely one-sided. One study that directly compared outcomes found no significant differences in patient-reported function scores, pain, or satisfaction, though the complication rate trended higher in the Sauvé-Kapandji group (about half of those patients experienced a complication, compared to roughly a third in the Darrach group).5PubMed Central. A Comparative Study Between Darrach and Sauvé-Kapandji Procedures for Post-Traumatic Distal Radioulnar Joint Dysfunction So the Sauvé-Kapandji offers biomechanical advantages, particularly for younger or more active patients who need grip strength and wrist stability, but at the cost of a somewhat more complex recovery.
Functional Results After Surgery
The headline numbers across multiple studies are encouraging. Forearm rotation typically improves substantially. In one series of patients with osteoarthritis, average pronation went from about 66 degrees before surgery to 78 degrees afterward, and supination improved from about 64 degrees to 82 degrees. Wrist flexion and extension also showed gains, and grip strength increased, though those improvements did not reach statistical significance in that particular study.6The Journal of Hand Surgery. The Sauvé-Kapandji procedure for osteoarthritis of the distal radioulnar joint
Pain relief is one of the most consistent findings. A case report review described “outstanding pain alleviation” alongside improved grip strength and retained wrist motion.7PubMed Central. The outcome of Sauve Kapandji procedure on patient with DRUJ arthritis: A case report Across a broader dataset, grip strength improved from an average of about 9 kg before surgery to 13 kg after, a significant gain.8American Association for Hand Surgery. Sauve-Kapandji Remains a Viable Option for Distal Radioulnar Joint Dysfunction
A modified version of the procedure, using what the authors called a “quadrangular construct” to stabilize the ulnar stump, reported mean wrist scores improving from 32 to nearly 80 on the Modified Mayo Wrist Score over an average follow-up of about three years. Most patients landed in the “good” outcome category.9PubMed Central. “Quadrangular-construct” modification of Sauve-Kapandji procedure
The Ulnar Stump Problem
If there is one complication that defines the Sauvé-Kapandji procedure, it is instability of the proximal ulnar stump, the free-floating piece of ulna left behind after the bone gap is created. This stump can shift or rock during forearm rotation, pressing on surrounding tendons and causing pain, clicking, or weakness. It is the procedure’s Achilles heel.
Long-term data shows a clear relationship between stump instability and poor outcomes. When researchers measured stump movement with ultrasound, greater instability correlated strongly with worse scores on disability questionnaires and weaker grip strength and supination torque.10PubMed Central. Long-term results of Sauvé-Kapandji procedure
How much bone you remove matters enormously. A retrospective study of 44 patients found that when the gap in the ulna was kept shorter than 35 millimeters, patients could reliably expect improved motion and high satisfaction. Larger resections left a shorter proximal stump, and that shorter stump was more prone to painful instability.11PubMed. Amount of ulnar resection is a predictive factor for ulnar instability problems after the Sauvé-Kapandji procedure Surgeons now generally aim for the smallest resection that still allows free forearm rotation.
Modifications to Prevent Stump Instability
Because stump instability is so common and consequential, surgeons have developed several modifications to the original technique. One popular approach uses a strip of the extensor carpi ulnaris tendon, which runs along the back of the ulnar side of the forearm, to create a sling or tether that holds the proximal stump in place. Early reports on this modification showed satisfactory results and improved stump stability on X-ray at an average of about three years.12PubMed. Stabilization of the proximal ulnar stump in the Sauvé-Kapandji procedure by using the extensor carpi ulnaris tendon: long-term follow-up studies
A case-control study compared the original procedure with two different tendon-stabilization modifications. All three groups had similar patient populations with post-traumatic DRUJ instability, allowing a reasonably fair comparison of the techniques.13PubMed. Functional outcomes after the Sauvé-Kapandji procedure for distal radio-ulnar post-traumatic instability Though the modified versions are now widely preferred for this reason, there is no single standard modification. Surgeons tend to choose a stabilization method based on the patient’s tissue quality and the specific anatomy they encounter intraoperatively.
Another Complication to Watch For
Beyond stump instability, the pseudoarthrosis itself can cause trouble by doing the opposite of what you want: healing. The whole point of the bone gap is to remain a gap, allowing rotation. But bone has a natural drive to repair itself, and in some patients the pseudoarthrosis fills in with new bone, locking the two pieces of ulna back together. This is called ossification of the pseudoarthrosis, and it eliminates the forearm rotation the procedure was designed to preserve.
A literature review found that roughly one in ten cases developed this ossification, and about two-thirds of those patients required revision surgery to re-create the gap. The time from the initial operation to ossification ranged widely, from about one year to over five years.14PubMed Central. Ossification of the pseudarthrosis following the Sauvé-Kapandji procedure: a case report and review of the literature This is one reason follow-up imaging is important even when things feel fine initially. Forearm rotation may gradually decrease as new bone slowly bridges the gap, and catching the problem early can simplify any revision.
Long-Term Outlook
Most of the published research on this procedure involves relatively short follow-up periods of a few years, so the long-term picture has historically been less clear. A recent study with a median follow-up of nearly seven years (and some patients tracked beyond thirteen years) provided a more extended view. Pain scores at that point averaged about 4 out of 10 on the wrist pain scale, and functional limitation averaged about 3 out of 10, suggesting that most patients maintained meaningful improvement in daily life well after surgery.15PubMed Central. Long-term outcome of the Sauvé-Kapandji procedure in patients with post-traumatic distal radioulnar joint disorders
Those numbers are not perfect scores, and they reflect the reality that many patients still have some residual symptoms. The procedure is a salvage operation, typically performed on joints that are already badly damaged. Returning to a completely pain-free, fully functional wrist is unrealistic for most people. But moving from severe pain and limited rotation to moderate comfort and functional use of the hand represents a major quality-of-life gain.
When the Procedure Fails
No surgery works every time. When the Sauvé-Kapandji fails because of persistent stump instability, recurrent ossification of the pseudoarthrosis, or ongoing pain, there are salvage options. One is implanting an ulnar head prosthesis, which replaces the problematic stump and the fused joint with a metal implant. A small series of three patients who received ulnar head prostheses after failed Sauvé-Kapandji procedures showed meaningful improvement at short-term follow-up.16PubMed. Salvage of failed Sauvé-Kapandji procedure with an ulnar head prosthesis: report of three cases
A more comprehensive salvage option is total DRUJ replacement, which resurfaces both sides of the joint. One early report described using a total DRUJ implant to rescue a failed Sauvé-Kapandji, noting that the design could restore stability in situations where the patient’s own soft tissues were no longer adequate to hold things together.17PubMed. Salvage of a failed Sauve-Kapandji procedure using a total distal radio-ulnar joint replacement Total DRUJ replacements have also been described as a primary salvage for various failed procedures including the Sauvé-Kapandji.18PubMed Central. Preliminary experience with a new total distal radioulnar joint replacement
These implant-based salvage options are still relatively new, and the published case numbers are small. They represent a last resort rather than a routine backup plan, but the fact that they exist means that a failed Sauvé-Kapandji does not necessarily leave the patient without options.
A Brief History of the Procedure
The procedure’s name credits Louis de Gonzague Sauvé and Mehmed Kapandji, who published their description in 1936. But the idea of fusing the DRUJ while creating a proximal osteotomy was not entirely new at that point. Similar techniques had been described by Berry in 1930 and Steindler in 1932, and there has been some academic debate about who deserves priority.19PubMed. History and evolution of the Sauvé-Kapandji procedure Regardless of who got there first, the 1936 paper is the one that stuck in the surgical vocabulary, and the procedure has been iteratively refined ever since, particularly with the stump-stabilization modifications that emerged in the 1990s and 2000s.
It is worth knowing this history mainly because it explains why you might encounter slight variations in how the procedure is performed. The core concept (fuse the DRUJ, create a pseudoarthrosis) has been stable for nearly a century, but the details of how to prevent stump instability, how much bone to resect, and what hardware to use for the fusion have all evolved. If your surgeon describes a “modified Sauvé-Kapandji,” they are usually referring to one of these stump-stabilization techniques rather than a fundamentally different operation.
Choosing Between the Sauvé-Kapandji and Other Options
For younger, more active patients who need reliable grip strength and plan to use their hands for physically demanding work, the Sauvé-Kapandji’s preservation of the ulnar head gives it a structural advantage over the simpler Darrach resection. The meta-analysis finding that Sauvé-Kapandji patients were more likely to return to work supports this.20PubMed Central. Darrach vs. Sauve-Kapandji: A Comprehensive Meta-Analysis of Surgical Outcomes in Distal Radioulnar Joint (DRUJ) Dysfunction For older, less active patients where the main goal is pain relief and the demands on grip strength are lower, the Darrach may be reasonable and comes with a simpler recovery.
Total DRUJ replacement is the emerging third option, but it is typically reserved for cases where other procedures have failed or where the joint destruction is so severe that salvage procedures are unlikely to succeed. The implants are expensive, the surgery is technically demanding, and long-term data is still accumulating. For most patients facing their first surgery for DRUJ problems, the choice remains between the Sauvé-Kapandji and the Darrach, with the decision hinging on age, activity level, the condition of the surrounding soft tissues, and the surgeon’s experience with each technique.