Dr. Leo Zalikha’s fellowship training at Stanford Medicine specifically prepared him for these cases. Complex primary arthroplasty requires the same tools and judgment as revision surgery: specialized implants, advanced surgical techniques, and the ability to adapt the plan intraoperatively when unexpected findings arise.

What Makes a Primary Joint Replacement Complex

Severe Deformity

Some patients present with significant bowing, angular deformity, or contracture (a joint that will not fully straighten or bend) from long-standing untreated arthritis. The greater the deformity, the more challenging it is to correct alignment, balance the soft tissues, and position the implants properly. In the knee, severe varus (bow-legged) or valgus (knock-kneed) deformity requires soft tissue releases and careful balancing to achieve a stable, well-aligned result. In the hip, fixed flexion contracture or severe protrusio (where the femoral head has migrated deeply into the pelvis) adds complexity.

Bone Deficiency

Some patients have poor bone stock before their first joint replacement. This can result from:
Long-standing arthritis with bone erosion
Avascular necrosis with collapsed bone
Previous trauma with bone loss or hardware
Metabolic bone disease or osteoporosis
Prior surgery (osteotomy, fracture fixation) that altered the anatomy When bone is deficient, standard implants may not achieve reliable fixation.Specialized components, bone graft, or augments may be needed even for a first-time replacement.

Prior Surgery on the Joint

Patients who have had previous surgeries on or around the hip or knee (fracture fixation, osteotomy, ligament reconstruction, arthroscopy with hardware) present additional challenges:
Retained hardware may need to be removed before implant placement
Scarring and altered anatomy change the surgical exposure
Prior incisions affect soft tissue blood supply and wound healing
Bone morphology may be altered by prior procedures

Post-Traumatic Arthritis

Arthritis that develops after a fracture (post-traumatic arthritis) is a common reason for complex primary arthroplasty. The fracture may have healed with malalignment, bone loss, or hardware in place. Converting from prior fracture fixation to joint replacement requires careful planning and the ability to manage unexpected intraoperative findings.

Unusual Anatomy

Conditions such as hip dysplasia (a shallow socket that never formed normally), Paget's disease (abnormal bone remodeling), and skeletal dysplasia create anatomic challenges that require modified surgical techniques and sometimes custom implants.

High Medical Risk

Patients with significant medical comorbidities (severe obesity, poorly controlled diabetes, immunosuppression, cardiac or pulmonary disease) have higher complication rates. Managing these patients requires attention to perioperative medical optimization, careful anesthesia planning, and awareness of healing and infection risks.

How Dr. Zalikha Approaches Complex Cases

Detailed Preoperative Planning Complex primaries require more planning than straightforward cases. Dr. Zalikha uses: - Advanced imaging (CT scans when needed) to map the anatomy in three dimensions - Templating to determine implant sizing, positioning, and the need for specialized components - Coordination with other specialists when medical comorbidities require optimization - Review of prior surgical records and imaging to understand what has been done and how it affects the current plan
Intraoperative Flexibility No matter how thorough the plan, complex cases sometimes reveal surprises. Bone may be weaker than imaging suggested. The deformity may be more rigid than expected. Prior hardware may be difficult to remove. Dr. Zalikha approaches these cases with a plan, but also with the training and adaptability to modify the approach when needed.
Appropriate Implant Selection Complex primaries may require implants that are typically reserved for revision surgery: longer stems, augmented components, constrained bearings, or custom sizing. The fellowship-trained arthroplasty surgeon knows when standard implants are sufficient and when the situation demands more.

Who Needs a Complex Primary Specialist

You may benefit from seeing a fellowship-trained arthroplasty surgeon for your first joint replacement if:

Another surgeon has told you that your case is too complex or high-risk
You have significant deformity, prior fractures, or retained hardware around the joint
You have had previous surgery on the joint (other than the replacement itself)
You have unusual anatomy (hip dysplasia, Paget’s disease, skeletal abnormalities)
You have medical conditions that increase surgical risk and require specialized perioperative management
You want the assurance of a surgeon who trains on and manages the most difficult arthroplasty cases

The Goal Is the Same

Whether the case is straightforward or complex, the goal of primary joint replacement is the same: a well-positioned, stable, durable implant with restored function and minimal pain. Complex cases require more work to get there, but with proper training, planning, and execution, the outcomes can be excellent.

If you have been told your joint replacement will be complex, or if another surgeon has declined your case, schedule a consultation with Dr. Zalikha or call (562) 362-5024. For patients outside the area, a virtual second opinion is available.

Complex Primary Arthroplasty