What was viewed as a problem with unicompartmental knee arthroplasty?
A. Less technical then a total knee arthroplasty but will still need to do a TKA.
B. Appropriate patient selection.
C. Choice of implant geometry.
D. It does not provide a long-term solution for arthritis.
E. It requires careful surgical technique.
In lines 7 through 9 the author states that "A fundamental issue surrounding UKA is whether hydroxyapatite-coated unicompartmental components can provide a long-term solution to unicondylar arthritis."