Total Knee Arthroplasty- A Prospective Randomised Comparison between Functional Outcomes of Cruciate Retaining and Posterior Stabilising Implants.

Corresponding Author:
Prabhjeet Singh,
#199, Vivekananda Park,
Maksudan, Jalandhar,
Punjab, India.
E-mail: drgahra@gmail.com

ABSTRACT

BACKGROUND

Osteoarthritis knee is a leading cause of disability worldwide. Total knee arthroplasty (TKA) is considered as a reliable option to relieve pain and improve lifestyle of patients with osteoarthritis knee. However, there is no single best implant for total knee arthroplasty. Despite being debated since years, the controversy of cruciate retaining (CR) TKA vs Posterior stabilising (PS) TKA is still ongoing. Purpose of our prospective randomised trial is to compare the functional outcomes of CR and PS implants at short term follow-up in patients aged 45 years or more having TKA surgery for OA knee. We hypothesise that there is no difference in outcome of both implants.

METHODS

All the patients having age 45 years or more admitted to our institute for TKA surgery for OA knee were considered to be included in the study. Patients having knee disease other than OA, history of any knee surgery or high tibial osteotomy were excluded. All knees were randomised and divided into groups– CR and PS. Patients were evaluated preoperatively and at latest follow-up using Knee Society (KS) Knee Score, KS Function Score and the Western Ontario and MacMaster Universities Osteoarthritis Index (WOMAC).

RESULTS

104 knees in total, were evaluated with average follow-up of 3.9 ± 1.3 years in CR group and 3.7 ± 1.9 years in PS group. Outcome functional scores WOMAC, KS Knee score and KS Functional score showed significant improvement at final follow-up. However, there is no statistically significant difference among the two groups.

CONCLUSIONS

Both CR and PS designs are comparable in terms of clinical and functional outcome and implant survivorship at short term follow-up. The choice of design depends upon PCL status and surgeon’s preference.

KEY WORDS

Cruciate Retaining, Posterior Stabilized, Range of Motion, Total Knee Replacement, Functional Outcome, Knee Score