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Publications

417 PDF files · Organized by clinical topic

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417 of 417 PDF files

Anatomy & joint-line geometry36 PDFs
Ligaments & soft-tissue balance32 PDFs
Kinematics, gait & knee motion34 PDFs
Patellofemoral joint & trochlear tracking76 PDFs
Implant design & polyethylene geometry38 PDFs
Surgical technique & instrumentation20 PDFs
Component rotation & positioning7 PDFs
Comparative studies31 PDFs
Patient outcomes & recovery22 PDFs
Implant survivorship & complications16 PDFs
General reference & perspectives105 PDFs

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Selected reading

Medial stabilization.

16 papers on bearing geometry, measured motion, and clinical outcomes. Reviews may include the primary studies listed here.

Motion · Moonot et al. · 2009Tibiofemoral kinematic analysis of knee flexion for a medial pivot knee

Fluoroscopy · 13 patients / 15 knees

Medial-centered motion during lunge and kneeling, with less tibial rotation than reported for native knees.

Small, activity-specific series; no comparative patient-outcome claim.

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Outcomes · Scott & Gray · 2022Outcomes are Better With a Medial-Stabilized vs a Posterior-Stabilized Total Knee Implanted With Kinematic Alignment

Randomized trial · 200 patients · KA · 2 years

MS had greater maximum flexion (132° vs 124°) and a higher Forgotten Joint Score (68.3 vs 58.3).

Single center and specific implant systems. Not every enrollee completed every two-year measure; results do not isolate the polyethylene alone.

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Motion · Alesi et al. · 2022No kinematical difference between ultra-congruent and medial-congruent total knee arthroplasty when implanted with mechanical alignment

Dynamic RSA · 8 MC / 8 UC · MA

No detected difference in medial-pivot behavior during sit-to-stand; clinical flexion was greater with MC.

Small sample; absence of a detected difference is not proof of equivalence.

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Outcomes · Hoskins et al. · 2022Medial Pivot Designs Versus Conventional Bearing Types in Primary Total Knee Arthroplasty: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

Systematic review · 8 randomized trials · 725 knees

Pooled MP-versus-PS comparisons found no clear advantage in measured clinical outcomes.

One high-risk-of-bias trial excluded from pooling; insufficient randomized evidence for other bearing comparisons.

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Overview · Romano et al. · 2025Medial Congruent and Medial Pivot Inserts in Total Knee Arthroplasty: A Scoping Review

Scoping review · 39 articles · 6,143 TKAs

Generally favorable outcomes with both MC and MP constructs; terminology and surgical approaches vary.

Heterogeneous evidence does not establish equivalence, a universal PCL strategy, or comparative longevity.

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Motion · Nelson-Tranum et al. · 2025Implant design may influence knee flexor activation patterns during stair ascent and descent

Biomechanics and EMG · 52 patients · 1 year

Greater medial AP constraint was associated with lower biceps femoris activation during stair tasks.

Muscle activation is not proof of easier stairs, reduced fatigue, or superior patient outcomes.

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Outcomes · French et al. · 2020A Single Surgeon Series Comparing the Outcomes of a Cruciate Retaining and Medially Stabilized Total Knee Arthroplasty Using Kinematic Alignment Principles

Prospective comparison · 90 patients · KA · 1 year

Higher FJS and selected quality-of-life scores with MS; most other measures were comparable.

Small, nonrandomized, single-surgeon comparison with short follow-up.

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Outcomes · Jones et al. · 2023Better flexion and early recovery with medial-stabilized vs single-radius total knee arthroplasty with kinematic alignment: Two-year clinical results

Retrospective cohort comparison · 210 patients · KA

MS had greater flexion from six months to two years and selected early pain advantages.

Comparison across separate trials, not a direct randomized comparison. The MS cohort overlaps the Scott–Gray trial.

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Outcomes · Chang et al. · 2021A Prospective Randomized Controlled Trial Comparing Medial-Pivot versus Posterior-Stabilized Total Knee Arthroplasty

Randomized trial · 88 patients · 2 years

No detected differences in ROM or measured patient-reported outcomes between MP and PS.

Findings apply to the studied devices and follow-up; no significant difference does not establish equivalence.

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Motion · Tsubosaka et al. · 2021Mid-flexion stability in the anteroposterior plane is achieved with a medial congruent insert in cruciate-retaining total knee arthroplasty for varus osteoarthritis

Intraoperative comparison · 30 varus OA knees · CR-TKA

MC reduced AP translation under manual stress at 45° compared with CR inserts. Varus–valgus laxity was comparable.

Intraoperative mechanics, not evidence that MC prevents long-term clinical instability.

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Motion · Kaneda et al. · 2022Kinematically Aligned Total Knee Arthroplasty Using Medial Pivot Knee Prosthesis Enhances Medial Pivot Motion

Comparative kinematics · 13 knees / 9 patients · 1 year

KA knees showed greater lateral posterior travel and femoral external rotation than MA knees with the studied MP implant.

Exploratory: 8 KA and 5 MA knees. Does not establish clinical superiority.

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Outcomes · Tso et al. · 2021Clinical and Patient-Reported Outcomes of Medial Stabilized Versus Non-Medial Stabilized Prostheses in Total Knee Arthroplasty: A Systematic Review and Meta-Analysis

Systematic review · 21 studies / 13 pooled

FJS favored MS by 13.83 points, just below the review’s chosen clinical-importance threshold of 14; other differences were absent or not clinically important.

Thresholds and study populations vary; statistical significance alone is not clinical importance.

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Outcomes · Frye et al. · 2021A Medial Congruent Polyethylene Offers Satisfactory Early Outcomes and Patient Satisfaction in Total Knee Arthroplasty

Retrospective cohort · 327 TKAs · 1 year

MC improved selected early pain, FJS, and satisfaction measures; KOOS/PROMIS and MC-versus-PS satisfaction were similar.

Observational, short-term evidence; does not establish a universal satisfaction advantage.

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Motion · Schütz et al. · 2019Kinematic Evaluation of the GMK Sphere Implant During Gait Activities: A Dynamic Videofluoroscopy Study

Dynamic fluoroscopy · 3 groups of 10 patients

The studied Sphere construct limited medial AP excursion while permitting lateral travel and axial rotation.

Selected good-outcome patients and specific devices; industry-supported study.

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Motion · Delman et al. · 2021The posterolateral upslope of a low-conforming insert blocks the medial pivot during a deep knee bend in TKA: a comparative analysis of two implants with different insert conformities

Bilateral comparison · 25 patients · KA

The medial ball-in-socket/flat lateral construct maintained a medial pivot. A posterolateral upslope was proposed to explain different motion with the low-conforming CR construct.

Different implant systems, PCL management, and follow-up. No difference in median patient-reported outcomes.

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Motion · Gray et al. · 2020Comparison of posterior-stabilized, cruciate-retaining, and medial-stabilized knee implant motion during gait

Randomized implant groups · gait imaging · 74 patients

MS showed less AP drawer/paradoxical translation and a medial center of rotation.

All three implant designs still differed from healthy knees. Motion is not a patient-outcome measure.

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