The subvastus approach reaches the knee from beneath the quadriceps, leaving the muscle that straightens your leg intact.
Every knee replacement needs a path into the joint. The subvastus approach takes that path underneath the muscle on the inner side of your thigh.
That means the tendon above your kneecap is never cut. Dr. Debbi lifts the muscle gently aside and enters the knee from below it, so the muscles that straighten your leg stay intact.
The quadriceps is the muscle that straightens your leg. It gets you up stairs and steadies the knee with every step, so how fast you regain control of it shapes your early recovery.
Since the tendon is not cut, there is no repair that needs to heal first. Most patients can lift the leg off the bed within a few days and keep good strength through early therapy, so those first sessions go toward regaining motion instead of protecting a repair.
Lifting the muscle rather than splitting it also leaves the tissue around the kneecap undisturbed, so the kneecap usually tracks well on its own.
One thing to be clear about: the implant and how long it lasts are the same either way. What this changes is the first several weeks, and how soon the leg feels like yours again.
A CT scan of your knee is used to build a patient-specific model. Implant size, rotation, and alignment are planned in software against your own anatomy rather than a generic template.
The vastus medialis is elevated off the joint capsule and the knee is entered from beneath it. The quadriceps tendon above the kneecap is left completely intact.
Robotic guidance executes the plan within a fraction of a degree, which matters more in a muscle-sparing approach where the working window is deliberately smaller.
Ligament tension is measured through the full arc of motion and the plan is adjusted in real time, so the knee is balanced to how it actually moves, not just how it looks on an X-ray.
The femoral and tibial components are seated, and the bearing surface is trialled and checked through full flexion and extension before final fixation.
Closed in layers with absorbable sutures beneath the skin, so there are no staples and nothing to remove. A waterproof dressing lets you shower within days.
Timelines are typical, not guaranteed. Individual recovery varies with age, health, the condition of the knee before surgery, and how consistently you do your physical therapy. Dr. Debbi will give you a personalized plan.
The subvastus approach suits many knees but not all of them. A very stiff knee, a significant deformity, substantial prior surgery, or a heavily muscled thigh may call for a different exposure, since accurate implant position matters far more to your long-term result than the muscle plane used to reach the joint. Schedule an appointment with Dr. Debbi to discuss which approach is right for you.
