Knee Surg Relat Res.  2019 Sep;31(3):e3. 10.1186/s43019-019-0001-7.

Early functional outcomes after condylar-stabilizing (deep-dish) versus standard bearing surface for cruciate-retaining total knee arthroplasty

• Stirling P
• Clement ND
• MacDonald
• Patton JT
• Burnett R
• Macpherson GJ

• KMID: 2469783
• DOI: http://doi.org/10.1186/s43019-019-0001-7

Abstract

AIMS: The primary study aim was to compare early knee-specific function of patients undergoing cemented total knee arthroplasty (TKA) with either a cruciate-retaining (CR) polyethylene insert or a highly congruent condylar-stabilizing (CS) insert. Secondary aims were to compare general health and satisfaction between the groups.
METHODS
A total of 418 consecutive primary TKAs were identified retrospectively. Demographics and preoperative and 1-year postoperative patient-reported outcome measures (PROMs) were collected prospectively. PROMs consisted of Oxford Knee Scores, EuroQol-5 Dimensions scores, and Short Form-12 scores.
RESULTS
A total of 54 (12.9%) patients received a CS insert and 364 patients received a CR TKA. The CS group had a significantly (odds ratio (OR) 2.9; p = 0.002) greater proportion of females (77.8% versus 54.9%). The only significant difference in postoperative PROMs was a higher Short Form-12 physical component score in the CR group (difference 3.1; 95% confidence interval (CI) 0.1 to 6.1; p = 0.04). Linear regression analysis demonstrated no significant difference for all postoperative PROMs (p > 0.25). There was no significant difference in satisfaction rate (OR 0.94; 95% CI 0.42 to 2.12; p = 0.56) or pain visual analogue score (difference 6.1; 95% CI -1.9 to 14.0; p = 0.14) between the groups.
CONCLUSION
More congruent CS inserts have equivalent PROMs and patient satisfaction at 1 year compared with less congruent CR inserts. These represent an option for surgeons undertaking TKA where increased congruency is desired.

Keyword

Total knee arthroplasty; Outcome; Bearing surface; Deep dish; Cruciate retaining

MeSH Terms

Arthroplasty, Replacement, Knee*
Demography
Female
Humans
Knee
Linear Models
Mortuary Practice
Outcome Assessment (Health Care)
Patient Satisfaction
Polyethylene
Prospective Studies
Retrospective Studies
Surgeons
Polyethylene