Comparison of Posterior-Cruciate Retaining versus Substituting P.F.C. Total Knee Arthroplasty (A Randomized Study)

Churl Hong Chun; Jeong Woo Kim; Hyun Jun Kim; Chul Min Lim; Kwang Mee Kim

doi:10.4055/jkoa.2008.43.5.631

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Chun, Kim, Kim, Lim, and Kim: Comparison of Posterior-Cruciate Retaining versus Substituting P.F.C. Total Knee Arthroplasty (A Randomized Study)

Original Article

Journal of the Korean Orthopaedic Association

Journal of the Korean Orthopaedic Association 2008; 43(5): 631-637.

Published online: 31 October 2008

DOI: https://doi.org/10.4055/jkoa.2008.43.5.631

Comparison of Posterior-Cruciate Retaining versus Substituting P.F.C. Total Knee Arthroplasty (A Randomized Study)

Churl Hong Chun, M.D., Jeong Woo Kim, M.D., Hyun Jun Kim, M.D., Chul Min Lim, M.D., Kwang Mee Kim^*

Department of Orthopedic Surgery, School of Medicine, Wonkwang University, Iksan, Korea.

^*Department of Medicine, Wonkwang University Graduate School, Institute of Wonkwang Medical Science, Iksan, Korea.

Address reprint requests to Churl Hong Chun, M.D. Department of Orthopaedic Surgery, School of Medicine, Wonkwang University, 344-2, Shinyong-dong, Iksan, Chunbuk 570-711, Korea. Tel: +82.63-859-1363, Fax: +82.63-852-9329, cch@wonkwang.ac.kr

Abstract

Purpose

To compare the functional results of posterior cruciate-retaining (PCR) and posterior substituting (PS) replacement in patients undergoing primary total knee arthroplasty (TKA) for osteoarthritis.

Materials and Methods

A randomized controlled study was carried out to compare the clinical and radiological outcomes of PCR and PS primary P.F.C.® TKA. One hundred and sixty eight patients (188 cases), who had a primary diagnosis of osteoarthritis, and an intact functioning posterior cruciate ligament, were enrolled in this study. The patients were randomized regardless of the level of posterior cruciate ligament preservation. One hundred and eighty eight cases had a minimum 6-year follow-up, which included 96 and 92 cases in the PCR and PS groups, respectively.

Results

The Knee Society Score, the Hospital for Special Surgery (HSS) knee rating scores, average flexion contracture and radiologic alignment improved significantly, but there were no significant difference between the two groups. On the other hand, the mean postoperative flexion angles in the PCR and PS knees increased from 114.7° to 121.2° and 119.3° to 131.3°, respectively (p<0.05).

Conclusion

There were no significant differences between PCR and PS TKA in the follow-up knee scores. However, the level of postoperative improvement in further flexion was better in the PS group.

Keywords: Knee, Posterior cruciate retaining, Posterior cruciate substituting, P.F.C. total knee arthroplasty

Figures and Tables

Fig. 1

Preoperative and postoperative flexion angle in the PCR^* and PS^† TKAs. A significant difference was observed between the PCR and PS TKAs (p<0.05). ^*Posterior cruciate ligament retaining; ^†Posterior cruciate ligament substitution.

Table 1

Preoperative Data of the Patients

^*Posterior cruciate ligament retaining; ^†Posterior cruciate ligament substitution; ^‡Body mass index (kg/m²).

Table 2

A Comparison of the PCR and PS Total Knee Arthroplasty Group (Unit: mean±SD)

^*Posterior cruciate ligament retaining; ^†Posterior cruciate ligament substitution; ^‡Knee Society Score (KSS system); ^§Hospital for special surgery; ^∥A significant difference was demonstrated between the PCR and PS TKAs (p<0.05).

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