MAKO Muscle-Sparing Direct Anterior Hip Replacement
Dr. Lupo performs robotic-arm assisted total hip replacement through the direct anterior approach. It goes between natural muscle planes—no muscles are cut, split, or detached from bone.
Consultations are held at the AHN Orthopaedic Institute. Surgery is performed at AHN Saint Vincent Hospital's Total Joint Center in Erie.
Why Dr. Lupo Uses the Direct Anterior Approach
The direct anterior approach accesses the hip from the front, working between natural muscle planes. With Dr. Lupo's approach, no muscles are cut, split, or detached from bone.
Dr. Lupo combines this muscle-sparing approach with robotic-arm assisted technology. The system provides intraoperative information about component position, leg length, and offset to support the surgical plan.
The goal is to combine a tissue-sparing access route with CT-based planning and robotic guidance. The surgeon remains in control throughout the procedure, and individual outcomes vary.
Real Patient — 6 Weeks Post-Op
This image documents one patient's activity six weeks after surgery. Individual recovery and activity clearance vary.
Common Recovery Milestones
Where Will My Hip Surgery Take Place?
Dr. Lupo performs the hip replacement procedures described here at AHN Saint Vincent Hospital's Total Joint Center in Erie. The consultation office and hospital arrival location are different, so the care team will provide the correct instructions for each visit.
Nurse Navigation
AHN describes its Saint Vincent joint replacement program as including nurse navigation from preparation through recovery.
Joint Education
AHN describes preoperative education that helps patients and families understand surgery, discharge, and recovery.
Rehabilitation Support
AHN describes rehabilitation support coordinated according to the patient's procedure and individual care plan.
Services, discharge timing, and rehabilitation arrangements vary. Your care team will explain the plan recommended for you.
How Robotic-Arm Assisted Hip Surgery Works
CT-based 3D planning and robotic guidance help Dr. Lupo plan component position and assess leg length and offset during surgery.
CT-Based 3D Planning
A CT scan creates a precise 3D model of your pelvis and femur. Dr. Lupo plans the optimal cup positioning, stem position, and leg length target before surgery begins.
Robotic Precision
During surgery, the robotic system provides information about component position, leg length, and offset. Haptic boundaries help Dr. Lupo work within the plan.
Optimal Placement
Dr. Lupo uses the plan and intraoperative findings to position the components with the goals of stability, function, and appropriate leg-length balance.
What Published Studies Report
Research compares surgical approaches and robotic guidance across patient groups. These findings inform care but do not predict an individual's result.
70% Lower Dislocation Risk
Robotic-assisted hip replacement was associated with a 70% reduction in dislocation risk compared to conventional techniques (OR: 0.3), with the direct anterior approach adding further stability.
Source: Journal of Arthroplasty, 2024
75% Fewer Reoperations
Robotic-assisted total hip arthroplasty using the direct anterior approach demonstrated a 75% significant reduction in reoperations compared to manual techniques.
Source: Journal of Orthopaedic Experience & Innovation, 2025
Higher Forgotten Hip Score
Patients who underwent robotic hip replacement report higher Forgotten Joint Scores — meaning they forget they even have an artificial hip. The joint feels completely natural.
Source: Bone & Joint Journal, 2021
Faster Functional Recovery
Robot-assisted THA demonstrated improved 90-day clinical and patient-reported outcomes, with the greatest improvement in pain interference scores at both 6 weeks and 3 months.
Source: NYU Langone / Arthroplasty Today, 2024
About 4–5× Less Angular Error in One Study
In a 2026 intra-patient study, robotic cup placement averaged approximately 0.9° from plan versus 3.5°–4.7° with manual placement—about four to five times less angular error in that study.
Source: SICOT-J, 2026
No Muscles Cut or Detached
Dr. Lupo's direct anterior approach goes between natural muscle planes—no muscles are cut, split, or detached from bone.
Source: Mayo Clinic Randomized Study
The Enhanced Robotic Workflow Difference
Dr. Lupo uses an enhanced robotic workflow to assess cup position, leg length, and offset while carrying out the patient-specific plan. The surgeon remains in control throughout the procedure.
Direct Anterior vs. Other Hip Approaches
| Factor | Direct Anterior (Dr. Lupo) | Posterior Approach | Lateral Approach |
|---|---|---|---|
| Typical Tissue Path | Between natural planes; no muscles cut, split, or detached | May involve release and repair of short external rotators; technique varies | May involve abductor splitting or retraction; technique varies |
| Hip Precautions | No routine precautions for most patients; follow Dr. Lupo's instructions | Surgeon- and patient-specific protocol | Surgeon- and patient-specific protocol |
| Dislocation Risk | Varies by anatomy, diagnosis, implant position, activity, and other factors | Varies by technique, patient factors, and postoperative plan | Varies by technique, patient factors, and postoperative plan |
| Walking Without Aid | Individualized progression | Individualized progression | Individualized progression |
| Return to Driving | After surgeon clearance | After surgeon clearance | After surgeon clearance |
| Limp Risk | Minimal | Low | Higher (abductor weakness) |
Hip Replacement FAQ
What is the direct anterior approach to hip replacement?
The direct anterior approach accesses the hip from the front and goes between natural muscle planes. With Dr. Lupo's approach, no muscles are cut, split, or detached from bone. Recovery still varies by patient.
Why does Dr. Lupo use robotic technology for hip replacement?
The robotic arm provides information about cup position, leg length, and offset. Dr. Lupo uses that information with the CT-based plan and intraoperative findings while remaining in control throughout the procedure.
Where will my hip replacement surgery take place?
Dr. Lupo performs the hip replacement procedures described on this website at AHN Saint Vincent Hospital's Total Joint Center in Erie. Your consultation occurs at the AHN Orthopaedic Institute, and the care team will give you separate hospital arrival instructions before surgery.
Will I have hip precautions after surgery?
There are no routine hip precautions for most direct anterior patients. You may bend, cross your legs, and tie your shoes unless Dr. Lupo gives you different instructions based on your individual surgery.
How soon can I walk after robotic hip replacement?
Mobility commonly begins soon after surgery when medically appropriate. Weight-bearing, stairs, walking aids, driving, and return to activities depend on your procedure, health, balance, medications, home support, and Dr. Lupo's clearance.
What about leg length? Will my legs be even after surgery?
Dr. Lupo uses an enhanced robotic technique and does everything possible to make your leg lengths as close to even as possible. However, in severely shortened hips, there may be a limit to how far the leg can be lengthened. Additionally, if the hip is very loose, he may need to lengthen the leg slightly to create stability. Either way, Dr. Lupo does his best to achieve an unrecognizable leg length difference — a significant advantage over non-robotic techniques where leg length is estimated rather than measured.
How long does a robotic hip replacement last?
Implant longevity varies with implant design, positioning, activity, health, and other factors. Robotic planning is intended to support accurate component placement, but it cannot guarantee how long an implant will last.
Evidence-Based: Why This Approach Works
Every claim on this page is backed by peer-reviewed research. Here are the key findings — with links to the full evidence.
"Live X-Ray" (Fluoroscopy) Does NOT Improve Cup Positioning
Some surgeons market intraoperative fluoroscopy as a key advantage. Three separate meta-analyses covering 5,000+ patients have concluded it does not improve acetabular cup placement, does not reduce dislocation rates, and actually increases operating time. Meanwhile, MAKO robotic guidance achieves cup positioning accuracy within 1 degree — a 5x improvement over manual techniques.
Robotic Hip Replacement: 51% Fewer Complications, 5x Better Accuracy
A comprehensive analysis of 30,000+ procedures across 38 studies shows robotic-assisted hip replacement delivers significantly better implant positioning (94.7% vs 65.8% within safe zone), 51% fewer complications, and patients report their hip feels more natural. The 2026 intra-patient study proved MAKO achieves sub-degree accuracy.
The Direct Anterior Approach: Walk Same-Day, No Restrictions
An umbrella review of 11 meta-analyses reported differences in early recovery, pain, length of stay, and dislocation across approaches. For most of Dr. Lupo's direct anterior patients, there are no routine hip precautions unless he gives different instructions.
Ready to Move Without Hip Pain?
Call during office hours to schedule with Dr. Lupo and discuss whether hip replacement may be appropriate for you.