The Centers for Advanced Orthopaedics
Maryland Orthopedic Specialists
A Division of The Centers for Advanced Orthopaedics
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Knee

Varus / Valgus Knee Deformity with Arthritis

The mechanical alignment of the leg — how load passes from the hip through the knee to the ankle — profoundly affects which knee compartments bear the most stress. Varus deformity (bowleggedness) concentrates force on the medial compartment, accelerating medial arthritis. Valgus deformity (knock-knees) shifts load to the lateral compartment and produces lateral arthritis. Both patterns create a self-reinforcing cycle: more deformity means more uneven loading, faster cartilage loss, and worsening deformity. At Maryland Orthopedic Specialists, we have extensive experience managing both varus and valgus knees with the appropriate surgical planning and implant strategy to achieve durable, well-aligned outcomes.

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What is varus / valgus knee deformity with arthritis?

Varus deformity is the most common alignment problem in knee arthritis. The tibia bows medially relative to the femur, creating a bow-legged appearance. As medial cartilage wears, the knee settles further into varus — a progressive cascade. Varus is most commonly associated with medial compartment OA and post-traumatic conditions.

Varus deformity is the most common alignment problem in knee arthritis. The tibia bows medially relative to the femur, creating a bow-legged appearance. As medial cartilage wears, the knee settles further into varus — a progressive cascade. Varus is most commonly associated with medial compartment OA and post-traumatic conditions.

Valgus deformity produces a knock-knee appearance: the tibia is displaced laterally relative to the femur, overloading the lateral tibiofemoral compartment. Valgus is more commonly associated with rheumatoid arthritis, lateral compartment OA, post-traumatic malunion, and neuromuscular conditions. Severe valgus deformity is more challenging to correct than varus and requires specific surgical techniques.

Why alignment matters in TKA: Total knee arthroplasty restores normal mechanical alignment (approximately 0–3° of valgus on the mechanical axis) as a core surgical goal. Restoring alignment halts the deformity-driven progression of cartilage loading and is critical to implant longevity — malaligned components wear out prematurely.

Treatment options

Non-Surgical

Activity modification, analgesics, physical therapy, and — for unicompartmental varus — an unloader brace shifting load to the lateral compartment. These are symptomatic measures and do not correct the underlying deformity or halt progression.

Corrective Osteotomy

In younger patients (typically < 60–65) with unicompartmental arthritis, passively correctable deformity, and good bone stock, high tibial osteotomy (varus correction) or distal femoral osteotomy (valgus correction) realigns the mechanical axis, offloading the arthritic compartment. This delays or avoids arthroplasty in appropriately selected young, active patients.

Surgical Procedure

Total Knee Replacement

Complete resurfacing of the knee joint — femur, tibia, and patella — with metal and polyethylene implants to eliminate arthritis pain and restore mechanical alignment. Performed at a hospital facility with full inpatient support services.

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Frequently Asked Questions

Will my leg look straight after knee replacement?
Yes — one of the goals of TKA is to restore neutral mechanical alignment. Most patients with varus or valgus deformity notice their leg appears straighter and their gait more natural after surgery.
Is valgus knee replacement more complex?
Generally yes. The lateral structures must be released carefully to avoid over-correction into varus. Severe valgus deformity may require more constrained implants and longer operative time.
What is the difference between varus and valgus knee deformity?
A varus deformity — commonly called bow-legged — means the knee angles outward, concentrating force on the inner (medial) compartment of the joint. A valgus deformity — knock-kneed — means the knee angles inward, overloading the outer (lateral) compartment. Both deformities accelerate cartilage wear in the overloaded compartment and, when significant, affect the soft-tissue balance on the opposite side. Understanding which deformity you have is essential, as each requires different surgical planning and implant selection during knee replacement.
Can a brace or osteotomy help before I need a knee replacement?
For younger or more active patients with deformity and arthritis limited to one compartment, a high tibial osteotomy (HTO) or distal femoral osteotomy can realign the leg and shift weight away from the damaged compartment, significantly relieving pain and potentially delaying knee replacement by ten years or more. Offloading braces provide a non-surgical alternative that mimics this effect and can reduce pain meaningfully in appropriate patients. Your MOS surgeon will evaluate your age, activity level, imaging, and deformity severity to determine whether joint preservation or replacement is the right next step for you.
How long does recovery take after knee replacement for a varus or valgus deformity?
Recovery is similar to standard knee replacement, with most patients returning to independent walking and basic daily activities within four to six weeks. However, severe deformity corrections sometimes require additional soft-tissue procedures at the time of replacement to balance the knee, which can extend rehabilitation slightly. Physical therapy typically continues for two to three months, and full recovery of strength and stamina may take up to six months. At MOS we track your alignment and functional progress throughout recovery to ensure your knee is moving correctly and feels stable.

Meet the specialists

Christopher S. Raffo, MD

Christopher S. Raffo, MD

Orthopedic Surgery · Sports Medicine

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James S. Gardiner, MD

James S. Gardiner, MD

Orthopedic Surgery · Sports Medicine

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John J. Christoforetti, MD

John J. Christoforetti, MD

Orthopedic Surgery · Sports Medicine · Hip Preservation Surgery

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Brian McCormick, MD

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Related conditions

Total Knee Replacement
Medically reviewed by Christopher S. Raffo, MD
Last reviewed June 15, 2026

References

  1. Insall JN, Binazzi R, Soudry M, Mestriner LA. Total knee arthroplasty. Clin Orthop Relat Res. 1985;192:13–22. https://doi.org/10.1097/00003086-198501000-00003
  2. Ranawat AS, Ranawat CS, Elkus M, Rasquinha VJ, Rossi R, Babhulkar S. Total knee arthroplasty for severe valgus deformity. J Bone Joint Surg Am. 2005;87(Suppl 1):271–284. https://doi.org/10.2106/JBJS.E.00308
  3. Moreland JR. Mechanisms of failure in total knee arthroplasty. Clin Orthop Relat Res. 1988;226:49–64. https://doi.org/10.1097/00003086-198801000-00008
  4. Coventry MB. Osteotomy of the proximal portion of the tibia for degenerative arthritis of the knee. J Bone Joint Surg Am. 1965;47(6):1067–1097. https://doi.org/10.2106/00004623-196547060-00001
  5. American Academy of Orthopaedic Surgeons. Knee Alignment Problems. OrthoInfo. https://orthoinfo.aaos.org/en/diseases--conditions/knock-knees-genu-valgum/