Table 7: Patella resurfacing versus non-resurfacing: study details and qualitative outcomes
Study | n treatment/ control | Comparison | Supplemental analgesic | VAS scores and type of pain, where specified | Time to first analgesic request | Use of supplemental analgesic | Other important outcomes |
(LoE 1) | 58/60 | Patella resurfaced (PRes) vs. patella retained (Cont) | Not reported | __ | __ | __ | Pain Knee Society Pain score: NS at 2–4 years follow-up; patellofemoral pain postop: NS Functional outcomes Knee Society Function score: NS at 2–4 years follow-up; mean range of movement: NS; ability to exit car, rise from chair and climb stairs: NS |
44/44 | Patella resurfaced (PRes) vs. patella retained (Cont) | Not reported | __ | __ | __ | Pain Knee Society Pain score: NS at 5–7 years follow-up; anterior knee pain postop: NS Functional outcomes Knee Society Function score: NS at 5–7 years follow-up; mean range of movement: NS at 5–7 years follow-up; ability to exit car, rise from chair and climb stairs: NS | |
(LoE 1) | 42/48 | Patella resurfaced (PRes) vs. patella retained (Cont) | Not reported | __ | __ | __ | Pain Knee Society Pain score: NS at most recent follow up Anterior knee pain incidence at 10 years follow up: NS; anterior knee pain severity at 10 years follow up: NS Functional outcomes Knee Society Function score: NS at most recent follow up; range of motion: NS at most recent follow up; stair climbing: NS at 10 years follow up; flexion strength NS at most recent follow up Re-operation NS |
(LoE 1) | 50/50 | Patella resurfaced (PRes) vs. patella retained (Cont) | Not reported | __ | __ | __ | Pain Knee Society Pain score: NS at 8- to 10-year follow up PRes superior for % of patients with pain when walking (p=0.039) and when climbing stairs (p=0.042) at 8- to 10-year follow-up Functional outcomes Knee Society Clinical Rating System: clinical rating Cont> PRes at 2 years, NS at all other time points up to 10 years |
(LoE 1) | 47/48 | Patella resurfaced (PRes) vs. patella not resurfaced (Cont) | Not reported | __ | __ | __ | Pain Pain (mild or moderate) on compression/ grinding of patella: PRes superior (8% vs. 46%) at 30 months follow up (p<0.01); Knee Society Pain score: NS at most recent follow up Functional outcomes Knee Society Function score: NS at most recent follow up; range of movement: NS at 30 months follow up |
(LoE 1) | 243/231 | Patella resurfaced (PRes) vs. patella not resurfaced (Cont) | Not reported | __ | __ | __ | Pain Anterior knee pain prevalence: PRes superior (p<0.0001) (regardless of posterior cruciate ligament sacrifice or not and regardless of whether osteoarthritis or rheumatoid arthritis); mean knee score: PRes superior (p=0.0099) in osteoarthritis group, but NS in rheumatoid arthritis group Functional outcomes Knee Society Function score: NS; range of motion: NS |
(LoE 1) | 92/128 | Patella resurfaced (PRes) vs. patella not resurfaced (Cont) | Not reported | __ | __ | __ | Pain Anterior knee pain prevalence: PRes superior (p=0.016); Anterior knee pain severity: PRes superior (p=0.005); Knee Society Pain score: NS Functional outcomes Knee Society Function score: NS; range of motion: NS; stair climbing: NS for anterior pain; stair descending (number of patients descending one at a time, leading with involved limb): PRes superior–NS (p=0.059), but clinically important Re-operation NS |