Rehab after MPFL reconstruction, surgery that rebuilds the ligament holding the kneecap in place, usually starts with a brace and crutches for several weeks, early work to switch the quadriceps back on, and steady recovery of knee bend. Strength, balance and landing control follow, and many published protocols plan a return to sport around four to six months, closer to six or later for cutting and pivoting sports. If you live around Carmel, Westfield or Fishers, the matching team can propose an independent, licensed physical therapist who sees patients privately at Carmel City Center.
Last reviewed By the Monon Therapy Collective editorial team
- Early support
- Brace and crutches for several weeks
- Early priority
- Quadriceps activation and full straightening
- Return to sport
- Often 4 to 6 months, later for pivoting sports
- Combined bone surgery
- Slows weight bearing; follow your protocol
What does the MPFL do, and why is it reconstructed rather than repaired?
The medial patellofemoral ligament (MPFL) runs from the inner side of the kneecap to the thighbone and stops the kneecap sliding outward. OrthoInfo lists damage to this ligament among the main reasons a kneecap keeps dislocating, along with a shallow groove, knock-knee alignment and rotation of the leg bones.
After a first kneecap dislocation, many people are treated without surgery. When the kneecap keeps slipping out, surgeons often reconstruct the ligament with a tendon graft rather than stitch the stretched original, because a new graft gives a more reliable restraint. Some people also need a tibial tubercle osteotomy, a bone cut that moves the attachment of the kneecap tendon, which changes the early rehab rules.
Many patients are teenagers and young adults in jumping and pivoting sports such as volleyball, basketball, soccer and dance. Our page on patellar dislocation covers the non-surgical side.
For athletes in central Indiana, that often means club volleyball and basketball seasons that run through winter and tournaments at Grand Park in Westfield in spring and summer. Planning surgery and rehab around those calendars, rather than racing to beat them, gives the graft the months it needs.
What are the phases of MPFL reconstruction rehab?
The phases move from protection and quadriceps activation, to normal walking and knee bend, to strength and control, to agility and sport. These are common ranges from published university protocols; your surgeon’s protocol sets yours, especially if bone work was done.
| Weeks after surgery | Goals | Typical milestones |
|---|---|---|
| 0 to 2 | Protect the graft, switch on the quadriceps | Brace locked straight for walking; crutches; quad sets and straight leg raises; full straightening |
| 2 to 6 | Restore walking and knee bend | Brace unlocked in stages; weight bearing as cleared; knee bend toward 90 degrees and beyond |
| 6 to 12 | Build strength and control | Off crutches and brace; stationary bike; leg press, step-ups, hip and core strength |
| 3 to 4 months | Running and early agility | Jogging on flat ground once strength criteria are met; balance and landing drills |
| 4 to 6 months and beyond | Return to sport | Cutting, pivoting and jumping progressions; return-to-sport testing; full sport often near 6 months or later |
Why does the quadriceps seem to switch off after kneecap surgery?
Swelling and pain inside the knee inhibit the quadriceps, so after surgery many people cannot tighten the thigh or lift the straight leg without the knee sagging. Getting that muscle firing again is the first priority, because a quiet quadriceps leads to a stiff, bent knee and a slow recovery.
Early sessions often use quad sets with a towel roll under the knee, straight leg raises in the brace, and sometimes electrical stimulation to help the muscle contract. Swelling control with elevation, compression and ice helps too. Later, terminal knee extension with a band and controlled step work build on that foundation.
Knee bend is the other early goal. Your surgeon’s protocol usually sets weekly targets, and a therapist measures them with a goniometer. Falling behind is worth flagging early, because stiffness is harder to recover later.
Hip strength gets attention from the first week as well. Weak hip muscles let the thigh roll inward on landing, which pulls the kneecap outward, so side-lying leg raises, bridges and later single-leg work are part of most MPFL programs from the start.
- Quad sets with a towel under the knee
- Straight leg raises without a lag
- Heel slides for knee bend
- Patellar mobility only as the surgeon permits
- Hip and core strengthening from week one
Which MPFL rehab limits are set by the surgeon?
The surgeon sets brace settings, how much weight you may put through the leg, knee bend limits, and when running and sport are allowed. If a tibial tubercle osteotomy was done at the same time, weight bearing is usually restricted for longer to protect the healing bone.
Your therapist also needs to know what was found in surgery: cartilage damage under the kneecap, for example, can change how deep you squat and how quickly impact is added. Bring the operative note and protocol to the first visit. Our page on post-surgical rehabilitation explains how the surgeon and therapist usually share information.
How do you know the kneecap is ready for cutting, jumping and landing?
You know through testing that combines strength, movement quality and confidence. Common checks include quadriceps strength compared with the other leg, single-leg hop tests, step-down control without the knee caving inward, and a questionnaire about how stable the knee feels.
Fear of another dislocation is common after a kneecap has slipped out several times, and it changes how people land and cut. Practicing those movements in a controlled order, from two-leg landings to single-leg hops to reactive cuts, builds trust. The indoor turf at FlexWerk gives space for early agility work before you return to the court or field.
Our page on return-to-sport testing describes these tests in more detail, and the step-down exercise shows one building block for knee control.
Some athletes return wearing a kneecap stabilizing brace or sleeve for a season, mainly for confidence. That is a reasonable choice to discuss with your surgeon, but it does not replace the strength and control work that actually protects the knee.
Is prehab helpful before MPFL reconstruction?
Yes, when surgery is planned. Calming swelling, restoring full knee straightening and switching the quadriceps on before surgery tends to make the first weeks easier, and you will already know the exercises. Hip strength work and crutch practice are useful too.
When the patient is a minor, the two-minute questionnaire is filled in by a parent or legal guardian, who also comes to each session. With school schedules and seasons in mind, weekday sessions from 5 AM and weekend times in the suites can help fit rehab around classes and practice, depending on the therapist you are matched with.
Call your surgeon promptly after MPFL reconstruction if you notice
- The kneecap shifting or feeling as though it slipped, with sudden pain or swelling
- Calf pain, warmth and swelling, or chest pain and breathlessness (call 911 for these)
- Wound redness, drainage or fever
- Knee bend or straightening that is going backwards over a week
If you think it is an emergency, call 911.
