J Korean Orthop Assoc.  2010 Aug;45(4):287-292.

The Influence of Symtomless Degenerative Changes of the Patellofemoral Joint on Clinical Results of Medial Unicompartmental Knee Arthroplasty

Affiliations
  • 1Department of Orthopedic Surgery, Seoul Sacred Heart General Hospital, Seoul, Korea. kktkimos@hanmail.net

Abstract

PURPOSE
To evaluate the influence of degenerative changes in the patellofemoral joint on the clinical results of medial unicompartmental knee arthroplasty (UKA). MATERIALS AND
METHODS
Between January and December 2002, we operated on 180 cases of minimally invasive UKA using the Oxford(R) phase 3. Of the 180 cases, 156 were followed up for a minimum period of 5 years. Based on intraoperative degenerative findings of the patellofemoral joint, we classified cases into 4 groups (Group I-78 cases, Group II-40 cases, Group III-27 cases, Group IV-11 cases), and the clinical data were analyzed prospectively.
RESULTS
During follow-up, which averaged 6 years and 2 months, the knee score, the knee function score, the range of knee motion and the tibiofemoral angle were improved significantly (p<0.05) in all groups. The preoperative knee score and the tibiofemoral angle in the mild degeneration group (I, II) were higher than in the severe degeneration group (III, IV) (p<0.05). On the other hand, there were no significant differences between the groups in the postoperative knee score, the knee function score, the range of knee motion and the tibiofemoral angle (p>0.05). To date, no complication or failure involving the patellofemoral joint has been observed.
CONCLUSION
Clinical results of UKA are satisfactory for all groups, and the severity of patellofemoral degeneration has no influence on clinical outcome. Symptomless degenerative arthritis of the patellofemoral joint is not a contraindication for medial UKA.

Keyword

knee joint; medial compartment; patellofemoral joint; degenerative arthritis; unicompartmental arthroplasty

MeSH Terms

Arthroplasty
Follow-Up Studies
Hand
Knee
Knee Joint
Osteoarthritis
Patellofemoral Joint
Prospective Studies

Figure

  • Figure 1 (A) Preoperative radiographs of a 61-year-old woman show osteoarthritis of the medial compartment and patellofemoral joint in the right knee. (B) The last follow-up radiographs, 6 years after Oxford® phase 3 unicompartmental knee arthroplasty, show no changes of the patellofemoral joint.


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