What is the Difference Between Cortical and Cancellous Screws

Variable angle locking plates (VALPs) were introduced to give surgeons more freedom when placing screws, especially in complex periarticular fractures. Instead of being locked into one fixed trajectory, screws can be angled within a safe cone while still locking solidly into the plate. Over the last decade, these systems have moved from “nice innovation” to routine tools—so the big question now is: how do patients actually do in the long run?

Wrist Function Years After Distal Radius VALPs

Most of the long-term data for VALPs comes from distal radius fractures treated with variable angle volar locking plates. Prospective and retrospective studies consistently report excellent to good function one year and beyond. In a cohort of 25 distal radius fractures managed with variable angle plates, 72% of patients achieved excellent results and 24% good results by one year, with a mean Modified Mayo Wrist Score (MMWS) around 91. Grip strength recovered to roughly 80–90% of the opposite side, and range of motion was only slightly restricted compared with normal wrists.​

Comparative studies between fixed-angle and variable-angle volar plates show that both achieve acceptable radiographic and clinical outcomes, but VALPs often edge ahead in subtle ways. One study following 113 fractures for a mean of 14 months found that the variable-angle group had better Mayo and QuickDASH scores, slightly improved range of motion and grip strength, and required less K-wire augmentation than the fixed-angle group, with similar complication and reoperation rates. Other work has shown better restoration of volar tilt with variable-angle plates in unstable intra-articular patterns, again without an increase in long-term complications.​

Overall, patients treated with VALPs typically maintain good wrist function, low pain, and high satisfaction at 1–2 years, with radiographs showing durable alignment and joint congruity.​

Durability and Complication Profile Over Time

One concern with newer implant designs is whether extra screw flexibility might compromise mechanical strength over time. The long-term data so far is reassuring. Studies comparing fixed and variable designs in distal radius fractures report no significant differences in union rates or major complication rates, including tendon irritation, hardware failure, or loss of reduction. In the distal radius, reported nonunion is rare, and secondary procedures for hardware problems remain low for both plate types.​

VALPs also seem to maintain radiographic parameters well into follow-up. Long-term distal radius follow-up studies (including mixed fixed and variable plates) demonstrate that measurements like radial height, inclination, and ulnar variance remain stable beyond 12–24 months, and differences in functional scores between implant designs tend to narrow over time. Where VALPs may retain an advantage is in complex intra-articular fractures, where the ability to independently capture small fragments leads to smoother joint surfaces and fewer degenerative changes later.​

Shoulder and Other Periarticular Sites

While much of the high-quality long-term literature focuses on the wrist, similar principles extend to other periarticular regions where VALPs are used, such as the proximal humerus, distal femur, and peri-articular knee and ankle fractures. For proximal humerus fractures treated with angular stable plates (some with variable-angle options), mid-term studies at 2–4 years show that 70–80% of patients achieve good to excellent Constant scores, though outcomes are more sensitive to fracture pattern and medial support than to plate type alone. The variable-angle option is particularly valuable in fractures with medial calcar comminution, allowing calcar screws to be directed into remaining dense bone to prevent varus collapse—one of the main predictors of poor long-term function.​

In other joints such as the distal radius rim, Lisfranc complex, or periarticular knee, comparative studies generally report that variable-angle plates perform at least as well as fixed-angle plates in terms of union, alignment, and mid-term function, with some showing reduced operative time or fewer additional fixation devices.​

Patient-Reported Outcomes and Quality of Life

Patient-reported measures like QuickDASH, PRWE, and region-specific scores consistently reflect good long-term quality of life after VALP fixation. In distal radius series, QuickDASH scores at one year often fall below 10, indicating minimal disability, and remain low at later reviews. Longitudinal studies of wrist fracture treatment show that while different techniques can produce small differences early, by 1–2 years plates—especially modern volar locking designs—offer stable, lasting functional recovery in most older adults.​

The takeaway from current evidence is that variable angle locking plates deliver durable outcomes that are at least comparable, and often slightly superior, to fixed-angle systems in complex fractures, without adding long-term risk. Their real value shows up in the more challenging patterns—highly comminuted or osteoporotic periarticular fractures—where the freedom to fine-tune screw direction helps surgeons build stable constructs that keep alignment and joint function intact for years.

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