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This prospective cohort study aims to evaluate the effect of posterior condylar offset (PCO) and anterior condylar offset (ACO) changes on functional outcomes after primary total knee arthroplasty (TKA). Standardized imaging and clinical assessment protocols will be used to determine optimal PCO and ACO ranges associated with improved postoperative range of motion, patient-reported outcomes, and reduced anterior knee symptoms.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Primary TKA Cohort | Participants undergoing primary total knee arthtoplasty for knee osteoarthiritis will be prospectively followed. Patients will be evaluated based on postoperative changes in posterior condylar offset and anterior condylar offset. |
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| Measure | Description | Time Frame |
|---|---|---|
| Maximum Knee Flexion | maximum active knee flexion measured in degrees using a goniometer during clinical examination | 12 months postoperatively |
| Measure | Description | Time Frame |
|---|---|---|
| Knee Society Score | The Knee Society Score (KSS) is a clinician-reported outcome measure consisting of two components: the Knee Score (pain, stability, and range of motion) and the Function Score (walking distance and stair climbing). Each component ranges from 0 to 100, with a total possible score of 200. Higher scores indicate better knee function and clinical outcomes. | 3,6,12 months postoperatively |
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Inclusion Criteria:
Exclusion Criteria:
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patients undergoing primary total knee arthroplasty for osteoarthiritis
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 39107882 | Background | Zhong Y, Deng Z, Gu C, Li M, Kang Y, Liao W, Zhang Z. The Optimal Variation Range of Posterior Condylar Offset Associated with Positive Clinical Outcomes of Primary Total Knee Arthroplasty: A Retrospective Analysis. Orthop Surg. 2024 Nov;16(11):2708-2713. doi: 10.1111/os.14183. Epub 2024 Aug 6. | |
| 41656286 | Background |
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| WOMAC score | The Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) is a patient-reported outcome measure assessing pain, stiffness, and physical function. The total score ranges from 0 to 96, with higher scores indicating worse pain, stiffness, and functional limitation. | 3,6,12 months postoperatively |
| Change in Anterior and Posterior Condylar Offset | difference between preoperative and postoperative 1st day anterior condylar offset mesaured on lateral knee radiographs | preoperative graphy and postoperative 1st day graphy |
| Xu W, Huang X, Liu J, Zhang Z, Chen Z, Xia T, Yan B, Xu Y. Sagittal parameters after primary TKA affecting knee joint function: a correlative analysis and predictive model construction. J Orthop Surg Res. 2026 Feb 9;21(1):193. doi: 10.1186/s13018-026-06707-5. |